Page 1 TB8100 base station Service Manual MBA-00016-02 Issue 2 September 2006...
Page 2: Issue
Limited. service life is over. Please be environmentally The word TAIT and the TAIT logo are trademarks of responsible and dispose through the original supplier, Tait Electronics Limited. your local municipal waste “separate collection” service, All trade names referenced are the service mark, or contact Tait Electronics Limited.
Page 3: Table Of Contents
1.4.8 Tait FOCUS Database ........21...
Page 5 8.13 Boost Regulator Board (12V PA Only) ......168 TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 6 13.8.1 DC Converter without Microprocessor Control ....230 13.8.2 DC Converter with Microprocessor Control ....234 TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 8: Tait Electronics Limited September
Glossary ........... .295 TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 10 Identifying the circuitry in the AC module ......211 TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 11 Cable identification - sheet 2 ........292 Figure 19.5 Cables and mechanical parts used in the multi-reciter subrack... . . 293 TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 12: Preface
Preface Scope of Manual This manual contains information on servicing the TB8100 base station. Included are circuit descriptions, fault finding procedures, and mechanical assembly drawings for each module. Note TB9100 PAs and PMUs can also be serviced using this manual.
Page 13: Associated Documentation
The characters xx represent the issue number of the documentation. Technical notes are published from time to time to describe applications for Tait products, to provide technical details not included in manuals, and to offer solutions for any problems that arise.
Page 14: Publication Record
TaitNet Ethernet and TaitNet RS-232 system interface boards spare parts Servicing chapters for the reciter, PA and PMU divided into three new chapters: Disassembly and Reassembly Board Replacement Spare Parts minor corrections and additions TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 15: Safety And Servicing Information
Safety and Servicing Information This chapter contains general information on safety and servicing procedures for the TB8100 base station modules: reciter power amplifier (PA) power management unit (PMU) control panel. You will find specific safety and servicing information about individual modules in the appropriate chapters.
Page 16: Explosive Environments
1.1.2 Explosive Environments Warning!! Do not operate TB8100 equipment near electri- cal blasting caps or in an explosive atmosphere. Operating the equipment in these environments is a definite safety hazard. 1.1.3 Beryllium Oxide Caution Beryllium Oxide The termination resistors used in the 100W power amplifier contain some beryllium oxide.
Page 17: Equipment Safety
Fit the isolator as close as possible to the RF output connector on the PA. Do not connect any switching or combining equipment between the isolator and the PA. TB8100 Service Manual Safety and Servicing Information © Tait Electronics Limited September 2006...
Page 18: Regulatory Information
Tait Electronics Limited may invalidate your compliance authority’s approval to operate the equipment. 1. Refer to the TB8100 Specifications Manual (MBA-00001-xx) for more information on the compliance standards to which TB8100 equipment has been tested and approved. Safety and Servicing Information TB8100 Service Manual ©...
Page 19: General Servicing Information
They will be accorded ASC status and endorsed for repairs of TB8100 equipment after their staff have been trained and their facilities confirmed as suitable. Existing ASCs need to apply for and be granted an endorsement for repairs of TB8100 equipment.
Page 20: Website Access
ASC and Tait-only access Log-in passwords are needed for associate and Tait-only access; Technical Support supplies service centres with the necessary log-in information. The unsecured portion of the Technical Support website is accessible to the general public.
Page 21: Pcb Information
“Contact Information” on page 1.4.8 Tait FOCUS Database An additional source of information to service centres is the Tait FOCUS call-logging database. This is also accessible on the Technical Support website. All customer-related technical issues regarding TB8100 equipment are recorded on this database. These issues may be raised by both customers and service centres.
Page 22: Recommended Tools
It is beyond the scope of this manual to list every tool that a service technician should carry. However, the tools specifically required for servicing TB8100 equipment are listed in the table below. You can also obtain the TBA0ST2 tool kit from your nearest Tait Dealer or Customer Service Organisation.
Page 23: Identifying Screw Types
Identifying Screw Types 1.6.1 Torx Recess Head Screws Torx recess head screws are the standard type of screw used in all TB8100 equipment, although Pozidriv and Allen recess head screws are also used in a few special applications. Figure 1.2...
Page 24: Figure 1.3 Identifying Pozidriv And Phillips Screws And Screwdrivers
“star” markings between slots slots with parallel sides slots with tapered sides driving flutes with parallel sides driving flutes with tapered sides ridges between driving flutes Safety and Servicing Information TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 25: Replacing Components
Surface mount devices (SMDs) require special storage, han- dling, removal and replacement techniques. This equip- ment should be serviced only by an approved Tait Dealer or Customer Service Organisation equipped with the neces- sary facilities. Repairs attempted with incorrect equipment or by untrained personnel may result in permanent damage.
Page 26: Cased Mica Capacitors
PCB with a solder-resistant spike or equivalent. Make sure that the solder at the tab solder joint is melted or removed before attempting to lift the capacitor. Safety and Servicing Information TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 27: Reciter Circuit Description
The locations of the main circuit blocks on the boards are shown in Figure 2.14 on page Figure 2.15 on page Figure 2.16 on page Figure 2.17 on page TB8100 Service Manual Reciter Circuit Description © Tait Electronics Limited September 2006...
Page 28: Figure 2.1 Reciter High Level Block Diagram
Communications Synthesizer RISC Subsystem Control & Modulation Communications RF O/P + & Frequency PA Key Control Audio Exciter CODEC RF Board Digital Board System Control Bus System I/O Reciter Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 29: Digital Circuitry
(DSP) for demodulation. The digital channel filtering also decimates the sample rate down to 50kSPS (kilosamples per second) for the DSP. TB8100 Service Manual Reciter Circuit Description © Tait Electronics Limited September 2006...
Page 30: Digital Signal Processor (Dsp)
The DSP has three synchronous serial ports. Serial port 1 is connected to Serial Ports the DDC and receives base band samples. Serial port 2 is connected to the three CODECs (encoder/decoder). Serial port 3 is not used. Reciter Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 31: Figure 2.2 Reciter Digital Circuitry Block Diagram
Figure 2.2 Reciter digital circuitry block diagram TB8100 Service Manual Reciter Circuit Description © Tait Electronics Limited September 2006...
Page 32: Reduced Instruction Set Computer (Risc)
Rx Gate output Tx Relay output reciter hex switch reciter alarm LED DIP switch for manufacturing testing Reciter Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 33: Figure 2.3 Reciter Risc Functional Block Diagram
10MHz or 12.8MHz Rx L.O. Debug LEDs Synthesizers Test Ex L.O. DIP Switch 12.8MHz Lock Detects RF Board Chip Selects Chip Selects 40MHz Lock Detects Clock 40MHz Digital Board TB8100 Service Manual Reciter Circuit Description © Tait Electronics Limited September 2006...
Page 34 The RISC subsystem communicates with the system interface board via SPI set input and output gains mute and unmute outputs read digital inputs write digital outputs. Reciter Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 35: 40Mhz Digital Clock
±1mA charge pump circuit (also part of the synthesizer IC) and the passive loop filter circuit convert this error signal to a DC voltage (0 to 3V) to tune TB8100 Service Manual Reciter Circuit Description © Tait Electronics Limited September 2006...
Page 36: Vcxo
Branch references to the rest of the system. The branches provide a reasonable drive level at low impedance. Reciter Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 37: Figure 2.4 Reciter External Reference Block Diagram
Figure 2.4 Reciter external reference block diagram TB8100 Service Manual Reciter Circuit Description © Tait Electronics Limited September 2006...
Page 38: Receiver Rf Circuitry - Vhf Reciter
The signal from the mixer is fed to the IF amplifier through a 2-pole crystal filter which provides protection from strong off-channel signals. Note that there are two 2-pole crystal filters, one for narrow bandwidth and one for Reciter Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 39: Synthesizer
IC) and the active loop filter circuit convert this error signal to a DC voltage (0 to 22V ) to tune the VCO for correction. The 1. The normal lock range is between 3V and 16V. TB8100 Service Manual Reciter Circuit Description © Tait Electronics Limited September 2006...
Page 40: Vco
16.9MHz above (high side injection) to produce the 16.9MHz IF signal at the output of the mixer. Refer to “Identifying the Reciter” on page 70 for more information on reciter product types. Reciter Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 41: Figure 2.6 Reciter Receiver Synthesizer Block Diagram
Figure 2.6 Reciter receiver synthesizer block diagram TB8100 Service Manual Reciter Circuit Description © Tait Electronics Limited September 2006...
Page 42: Receiver Rf Circuitry - Uhf Reciter
(AGC) is provided at this point by a PIN diode attenuator. The signal is now amplified again in a second RF amplifier, and is then fed through a band pass filter and attenuator pad to the mixer. Reciter Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 43: Mixer
(clock, data and enable). When the data bits are latched in, the synthesizer processes the incoming signals from the VCO feedback signal (f ) and vcofb the reference oscillator (f TB8100 Service Manual Reciter Circuit Description © Tait Electronics Limited September 2006...
Page 44: Vco
It has internal self-bias circuitry, and the output provides enough RF power to drive the following stages. 1. The normal lock range is between 3V and 16V. Reciter Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 45: Figure 2.8 Reciter Receiver Synthesizer Block Diagram
Figure 2.8 Reciter receiver synthesizer block diagram TB8100 Service Manual Reciter Circuit Description © Tait Electronics Limited September 2006...
Page 46: Agc (H Band Only)
–22dBm at the AGC pick-off point. The AGC operates over a range of approximately 11dB. The AGC circuit can be enabled or disabled using the Service Kit (Configure > Base Station > Channel Profiles > General tab). Reciter Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 47: Exciter Rf Circuitry
TCXO and VCXO signals. The in-phase triangle frequency is referred to as “I channel” and the quadrature-phase triangle frequency is referred to as “Q channel”. TB8100 Service Manual Reciter Circuit Description © Tait Electronics Limited September 2006...
Page 48: Synthesizer
The VCO feedback attenuator is a resistive divider that terminates the VCO feedback signal in a fixed low impedance (50Ω). This attenuates the VCO RF level down to a level suitable for the RF prescaler (within the synthesizer IC). Reciter Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 49: Figure 2.10 Reciter Exciter Synthesizer Modulator Block Diagram - B, C And H Bands
Figure 2.10 Reciter exciter synthesizer modulator block diagram - B, C and H bands TB8100 Service Manual Reciter Circuit Description © Tait Electronics Limited September 2006...
Page 50: Figure 2.11 Reciter Exciter Synthesizer Modulator Block Diagram - K And L Bands
Figure 2.11 Reciter exciter synthesizer modulator block diagram - K and L bands Reciter Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 51: Vco - Vhf Reciter
Mechanical tuning is possible by adjusting the trimmer. Changes in the control voltage from the loop filter are applied to the varactors to facilitate electronic tuning. 1. The normal lock range is between 3V and 16V. TB8100 Service Manual Reciter Circuit Description © Tait Electronics Limited September 2006...
Page 52: Vco - Uhf Reciter
Mechanical tuning is possible by adjusting the trimmer. Changes in the control voltage from the loop filter are applied to the varactors to facilitate electronic tuning. Reciter Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 53: Exciter Control Circuit
The exciter control circuit uses Ex_Key to power up or shut down the VCO final driver, and PA_Key to power up or shut down the PA driver. TB8100 Service Manual Reciter Circuit Description © Tait Electronics Limited September 2006...
Page 54: System Interface Boards
The different types of board and their main features are listed in Table 2.1 on page 55. Refer also to Figure 2.12 on page Reciter Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 55 Manual, the Service Kit documentation, and to Application Note TN-1142-AN. Note This section provides details on the system interface boards avail- able at the time of publication. Other types may be developed for future applications. TB8100 Service Manual Reciter Circuit Description © Tait Electronics Limited September 2006...
Page 56: Figure 2.12 Reciter System Interface Board Block Diagram
Control Supply RS-232 RS-232 *SIPO = Serial In, Parallel Out PISO = Parallel In, Serial Out # these transformers are not fitted to the standard system interface board Reciter Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 57 5V. The low input threshold is 2V. A low input keys the transmitter. The digital inputs have 5V logic thresholds and are active low. The Digital Inputs maximum external pull-up voltage on these inputs is 20V. TB8100 Service Manual Reciter Circuit Description © Tait Electronics Limited September 2006...
Page 58 RS-232 Serial Port port (9-way female D-range connector). Note that when a reciter fitted with a TaitNet RS-232 system interface board is used in a TB8100 base station, the RS-232 port on the control panel is disabled. In this situation you must connect to the RS-232 port at the rear of the reciter.
Page 59: Power Supply
+2.5V regulator for the DSP. These are switched as part of the power saving modes. The +3.3V output is also supplied to the system interface board via a protection circuit. TB8100 Service Manual Reciter Circuit Description © Tait Electronics Limited September 2006...
Page 60: Figure 2.13 Reciter Power Supply Block Diagram
Analogue 3.3V Power PWD_RX Switch Lock-out Circuit* DSP Low 2.5V Regulator 2.5V 3.3V to SIF *To prevent DSP latch-up Protection Circuit SIF = system interface board 5V to SIF Reciter Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 61: Figure 2.14 Identifying The Circuitry On The Digital And System Interface Boards
40MHz digital clock 16.9MHz IF (VHF) / 70.1MHz IF (UHF) 12.8MHz reference 1& audio high speed data connector third-party connector VHF (B-band) reciter shown fitted with isolated system interface board TB8100 Service Manual Reciter Circuit Description © Tait Electronics Limited September 2006...
Page 63: Figure 2.15 Identifying The Circuitry On The Rf Board - B And C Bands
In order to show as much of the circuitry as possible in the photograph, the SMD shields have been removed. The photograph shows a B-band reciter. The layout of the C-band reciter circuitry is identical. TB8100 Service Manual Reciter Circuit Description © Tait Electronics Limited September 2006...
Page 65: Figure 2.16 Identifying The Circuitry On The Rf Board - H Band
RF input Note: In order to show as much of the circuitry as possible in the photograph, the SMD shields have been removed. TB8100 Service Manual Reciter Circuit Description © Tait Electronics Limited September 2006...
Page 67: Figure 2.17 Identifying The Circuitry On The Rf Board - K And L Bands
In order to show as much of the circuitry as possible in the photograph, the SMD shields have been removed. The photograph shows an L-band reciter. The layout of the K-band reciter circuitry is identical except where noted. TB8100 Service Manual Reciter Circuit Description © Tait Electronics Limited September 2006...
Page 69: Reciter Fault Finding
Customer Service Organisation for repair or replacement. The fault finding procedures provided in this chapter assume you are familiar with the operation of the TB8100 Service Kit and Calibration Kit. Figure 3.1 on page 71 identifies the individual boards.
Page 70: Identifying The Reciter
This explanation of reciter product codes is not intended to sug- gest that any combination of features is necessarily available in any one reciter. Consult your nearest Tait Dealer or Customer Service Organisation (CSO) for more information regarding the availabil- ity of specific models and options.
Page 71: Figure 3.1 Identifying The Reciter Boards
Identifying the reciter boards digital board RF board system interface board reciter shown fitted with isolated system interface board; UHF (H-band) RF board shown with shields removed for clarity TB8100 Service Manual Reciter Fault Finding © Tait Electronics Limited September 2006...
Page 72: Test Equipment
Test Equipment The following test equipment is required for carrying out the reciter fault Recommended Test Equipment finding procedures: PC with the latest version of the TB8100 Service Kit (refer to “Software and Firmware Compatibility” on page 74). Note The Calibration Kit is also installed when you install the Service Kit.
Page 73: Figure 3.2 Recommended Test Equipment Set-Up
Set-up for TaitNet RS-232 system interface board External 28VDC Reference Exciter Output Input To PC running RS-232 Service Kit or Calibration Kit System Interface Antenna Input Reciter 10-32VDC 15-way cable (TaitNet) TB8100 Service Manual Reciter Fault Finding © Tait Electronics Limited September 2006...
Page 74: Software And Firmware Compatibility
The new firmware may not be compatible with the other modules in the customer’s base station. Ensure that any TB8100 modules used to test the functionality of the reciter Compatibility with TB8100 Modules under repair are loaded with compatible firmware.
Page 75: Board Replacement
We recommend that you dispose of faulty boards according to your local Disposing of Faulty Boards environmental and safety regulations. Otherwise, return them to your nearest CSO for appropriate disposal. TB8100 Service Manual Reciter Fault Finding © Tait Electronics Limited September 2006...
Page 76: Initial Checks
B and C bands 285mA ±5mA H band 290mA ±5mA K and L bands 286mA ±5mA a. Digital board, RF board, and system interface board fitted and operational. Reciter Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 77 Select Monitor > Module Details > Reciter and check that the module details are correct. If they are, go to Step 7. If they are not, return the complete reciter to your nearest CSO for repair or replacement. TB8100 Service Manual Reciter Fault Finding © Tait Electronics Limited September 2006...
Page 78 You can save these details to a file if required. Note that the alarm history is erased when the reciter is powered down. Reciter Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 79 If the alarm is still present, return the complete reciter to your nearest CSO for repair or replacement. Synthesizer Out of Lock: Exciter Go to “Exciter” on page Synthesizer Out of Lock: Receiver Go to “Receiver” on page TB8100 Service Manual Reciter Fault Finding © Tait Electronics Limited September 2006...
Page 80: Figure 3.3 Typical 12.8Mhz Clock Wave Form
If the wave form meets these specifications, return to Task 2. If it does not, return the complete reciter to your nearest CSO for repair or replacement. Figure 3.3 Typical 12.8MHz clock wave form Reciter Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 81: Figure 3.4 Location Of The 12.8Mhz Clock Test Point On The Rf Board
Figure 3.4 Location of the 12.8MHz clock test point on the RF board B, C, and H bands K and L bands TB8100 Service Manual Reciter Fault Finding © Tait Electronics Limited September 2006...
Page 82: Visual Inspection
Check the SMA connector solder joint Task 3 — Check RF Connectors Check that the nuts securing the BNC/TNC connectors tightened correctly. Refer to “Screw Torque Settings” on page 100. Reciter Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 83: Figure 3.5 Visual Inspection Points For The Reciter
Visual inspection points for the reciter digital board RF board system interface board UHF (H-band) reciter shown fitted with isolated system interface board; RF board shown with shields removed for clarity TB8100 Service Manual Reciter Fault Finding © Tait Electronics Limited September 2006...
Page 84: Digital If
85. If it does not change, the digital board is faulty. Return the complete reciter to your nearest CSO for repair or replacement. Note The RSSI is only accurate down to a signal level of –98dBm (2.2µV). Reciter Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 85: Receiver
3.7), the RF board is faulty. Return the complete reciter to your nearest CSO for repair or replacement. If the RSSI and sensitivity are correct, go to “Exciter” on page TB8100 Service Manual Reciter Fault Finding © Tait Electronics Limited September 2006...
Page 86: Exciter
All reciters with hardware version 0.03 or later have a frequency stability of 0.5ppm (VCTCXO). Reciters with hardware version 0.02 or earlier have a frequency stability of 1ppm (TCXO). 1. H band only. Reciter Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 87 You do not have to test the other bandwidth(s) available. If the deviation is correct, go to “Audio” on page 89. If it is not, go Task 1. H band only. TB8100 Service Manual Reciter Fault Finding © Tait Electronics Limited September 2006...
Page 88 If the deviation is incorrect, recalibrate the exciter using the Calibra- tion Kit and then repeat your previous task. If the deviation is still incorrect, return the complete reciter to your nearest CSO for repair or replacement. Reciter Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 89: Audio
Step 8. If the measured out- put voltage is less than the voltage displayed on the gauge, go to Step TB8100 Service Manual Reciter Fault Finding © Tait Electronics Limited September 2006...
Page 90: Figure 3.6 Recommended Test Equipment Set-Up For Audio Checks
PC is connected to the CTU, run the Service Kit and connect to the reciter, then power up the reciter. Refer to TN-1142-AN for full Ethernet connection details. Reciter Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 91: Figure 3.7 Location Of Audio Test Points On The Digital Board
, the digital board is faulty. Return the complete reciter to your nearest CSO for repair or replacement. Figure 3.7 Location of audio test points on the digital board TB8100 Service Manual Reciter Fault Finding © Tait Electronics Limited September 2006...
Page 92 If the voltages are less than 1V , the digital board is faulty. Return the complete reciter to your nearest CSO for repair or replacement. Reciter Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 93 , replace the system interface board. If the voltage is 1V or less, the digital board is faulty. Return the com- plete reciter to your nearest CSO for repair or replacement. TB8100 Service Manual Reciter Fault Finding © Tait Electronics Limited September 2006...
Page 94: Figure 3.8 Location Of Audio Test Points On The System Interface Board
Location of audio test points on the system interface board Note Figure 3.8 shows an isolated system interface board. The test points are in the same locations on the other models of system interface board. Reciter Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 95: Final Tasks
Accredited Service Centre, and level-2 service centres should return the reciter to the International Service Centre. Supply details of the customer, the fault and, if applicable, the attempted repair. TB8100 Service Manual Reciter Fault Finding © Tait Electronics Limited September 2006...
Page 96 Note The information in these tables is extracted from the TB8100 Specifications Manual. Refer to the latest issue of this manual (MBA-00001-xx) for the most up-to-date and complete specifi- cations. Table 3.2 Final tests for the receiver Test Limits Switching Range >2% of the centre frequency...
Page 97 Line Input - Balanced Input Level Range –20dBm to +10dBm Impedance 600Ω balanced b. 60% modulation at 1kHz Line Input - Unbalanced Input Level Range 0.3Vpp to 3Vpp Impedance >10kΩ TB8100 Service Manual Reciter Fault Finding © Tait Electronics Limited September 2006...
Page 99: Reciter Disassembly And Reassembly
UHF (H-band) reciter fitted with an isolated system interface board. However, the same basic procedures and techniques apply to other models of reciter and system interface board. TB8100 Service Manual Reciter Disassembly and Reassembly © Tait Electronics Limited September 2006...
Page 100: Screw Torque Settings
If necessary, remove the two M3 screws securing the fan duct the heatsink. Remove the vent guard clip from the rear panel. Reciter Disassembly and Reassembly TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 101: Tait Electronics Limited September
RF board. Figure 4.1 Removing the front and rear panels front view rear view digital side RF side RF side 2 for each rear panel TB8100 Service Manual Reciter Disassembly and Reassembly © Tait Electronics Limited September 2006...
Page 102: Refitting The Front And Rear Panels
Press the covers firmly into place and secure with the M3 Torx screws. Note The covers are not interchangeable. Each cover must be fitted to the correct side and in the correct orientation. Reciter Disassembly and Reassembly TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 103: Reciter Board Replacement
UHF (H-band) reciter fitted with an isolated system interface board. However, the same basic procedures and techniques apply to other models of reciter and system interface board. TB8100 Service Manual Reciter Board Replacement © Tait Electronics Limited September 2006...
Page 104: Replacing The System Interface Board
Important Make sure the flexible connector is correctly positioned and latched in its socket, as shown in Figure 5.2 on page 107. Reciter Board Replacement TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 105 To reprogram this information into the reciter, you will need to use a dongle with the Calibration Kit. TB8100 Service Manual Reciter Board Replacement © Tait Electronics Limited September 2006...
Page 106: Figure 5.1 Replacing The System Interface Board
Figure 5.1 Replacing the system interface board Reciter Board Replacement TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 107: Figure 5.2 Reconnecting The Flexible Connector
Figure 5.2 Reconnecting the flexible connector blue stripe on same latch pushed fully down flexible connector inserted side as latch at both ends straight into socket TB8100 Service Manual Reciter Board Replacement © Tait Electronics Limited September 2006...
Page 109: Reciter Spare Parts
Reciter Spare Parts This chapter lists the spare parts available for the TB8100 reciter at the time this manual was published. Spare circuit board assemblies are listed in Table 6.1. Mechanical parts are listed in Figure 6.1 on page 111.
Page 111: Figure 6.1 Reciter Mechanical Assembly
Note: The characters XX in an IPN (Tait Internal Part Number) stand for the issue number of the part. Only the latest issue of each part will normally be available for ordering as spare or replacement parts.
Page 113: Power Amplifier Circuit Description
Power Amplifier Circuit Description The TB8100 power amplifier (PA) is a modular design with the circuitry divided between separate boards. These boards are assembled onto a heatsink in different configurations in different models. Figure 7.1 on page 114 shows the configurations for a 100W 28V PA and 50W 12V PA, along with the main inputs and outputs for power, RF and control signals.
Page 114: Figure 7.1 Pa High Level Block Diagrams
RF O/P Board Board Low-Pass Filter & Directional Control & Control & Monitor Monitor Coupler Control & System Board Monitor Control Control Board Ambient Air Temperature Sensor Board Power Amplifier Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 115: Microprocessor Control Circuitry
In all instances there is a small amount of hysteresis between the value at which the alarm, foldback or shutdown activates and the value at which the alarm or shutdown is cleared. TB8100 Service Manual Power Amplifier Circuit Description © Tait Electronics Limited September 2006...
Page 116: Pa-Key
60W final transistor 2 exceeds the maximum allowable current. is defined as follows: Model 100W 1. The accuracy of the measurement of the parameter values is subject to the tolerances listed in the Specifications Manual. Power Amplifier Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 117: Figure 7.2 Pa Control, Rf And Power Supply Circuitry Block Diagram
Figure 7.2 PA control, RF and power supply circuitry block diagram TB8100 Service Manual Power Amplifier Circuit Description © Tait Electronics Limited September 2006...
Page 118: Shutdown
The foldback loop is analogue until the VSWR reaches 10:1, at which point the microprocessor initiates foldback. The microprocessor and control loop are also used to shape the RF signal envelope during key-on and key-off transients. Power Amplifier Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 119: Fan Control
PA fan, and power foldback. The foldback thresholds are set in the factory and cannot be adjusted by the user. A recovery hysteresis of 5°C is applied to all temperature thresholds. TB8100 Service Manual Power Amplifier Circuit Description © Tait Electronics Limited September 2006...
Page 120: Ambient Air Temperature Sensor
60W. The 60W transistor operates off a +28V supply. The 60W board also has circuitry to monitor the drain current and temperature of the 60W transistor. Power Amplifier Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 121: Low Pass Filter And Directional Coupler Board
They have no components and their only function is to link two parts of the circuit together. The interconnect boards are shown in Figure 8.1 on page 130 Figure 8.2 on page 131. TB8100 Service Manual Power Amplifier Circuit Description © Tait Electronics Limited September 2006...
Page 122: Boost Regulator Circuitry (12V Pa Only)
1. Refer to the TB8100 Installation and Operation Manual (MBA-00005-xx) for more information on this connection. Power Amplifier Circuit Description TB8100 Service Manual ©...
Page 123: Figure 7.3 Identifying The Circuitry On The 28V Pa Boards
This drawing shows a 100W UHF (H-band) PA. The configuration of 1& other models is shown in Figure 8.1 on page 130 Figure 8.2 on page 131. TB8100 Service Manual Power Amplifier Circuit Description © Tait Electronics Limited September 2006...
Page 125: Figure 7.4 Identifying The Circuitry On The 12V Pa Boards
This drawing shows a 50W VHF (B-band) 12V PA. The 5W 12V PA has the same configuration, except the 5W interconnect board is fitted in place of the 50W interconnect board and 60W board. TB8100 Service Manual Power Amplifier Circuit Description © Tait Electronics Limited September 2006...
Page 127: Power Amplifier Fault Finding
The fault finding procedures provided in this chapter assume you are familiar with the operation of the TB8100 Service Kit and Calibration Kit. Figure 8.1 on page 130 Figure 8.2 on page 131 identify the individual boards and show how they are configured in different models.
Page 128: Safety Precautions
RF components or tracks in the PA while it is transmitting. Caution The TB8100 power amplifier (PA) weighs between 4.8kg (10.6lb) and 5.8kg (12.8lb). Take care when handling the PA to avoid personal injury. 8.1.2...
Page 129: Identifying The Pa
520MHz. PAs with hardware version 00.01 and earlier can only operate from 400MHz to 520MHz. b. The actual frequency coverage in this band when used with a K-band TB8100 reciter is 762MHz to 776MHz, and 850MHz to 870MHz. c. The actual frequency coverage in this band when used with an L-band TB8100 reciter...
Page 130: Figure 8.1 Identifying The Circuit Boards In A 28V Pa
5W interconnect board 60W board 50W interconnect board low pass filter/directional coupler board splitter board control board combiner board ambient air temperature sensor board 100W interconnect board (VHF only) Power Amplifier Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 131: Figure 8.2 Identifying The Circuit Boards In A 12V Pa
50W interconnect board and 60W board. 6W board ambient air temperature sensor board 60W board boost regulator board low pass filter/directional coupler board 50W interconnect board control board TB8100 Service Manual Power Amplifier Fault Finding © Tait Electronics Limited September 2006...
Page 132: Test Equipment
PA. The following test equipment is required for carrying out the PA fault Recommended Test Equipment finding procedures: PC with the latest version of the TB8100 Service Kit (refer to “Software and Firmware Compatibility” on page 136). Note The Calibration Kit is also installed when you install the Service Kit.
Page 133 PC is connected to the control panel, run the Serv- ice Kit and connect to the base station, then power up the base sta- tion. Refer to TN-1142-AN for full Ethernet connection details. TB8100 Service Manual Power Amplifier Fault Finding © Tait Electronics Limited September 2006...
Page 134: Figure 8.3 Recommended Test Equipment Set-Up For Initial Checks - 28V Pa
Recommended test equipment set-up for initial checks - 28V PA Load RF Power Meter Reciter Subrack system control bus Interconnect Board Control Panel connected within subrack system interface RS-232 10-32VDC Power Amplifier Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 135: Figure 8.4 Recommended Test Equipment Set-Up For Initial Checks - 12V Pa
RS-232 system interface 10-32VDC 12V PA DC input connector The matching socket for this connector is available as part number 240-00022-11 (Phoenix MVSTBR2.5HC/2-ST/5.08 female). TB8100 Service Manual Power Amplifier Fault Finding © Tait Electronics Limited September 2006...
Page 136: Software And Firmware Compatibility
PA’s firmware version. The new firmware may not be compatible with the other modules in the customer’s base station. Ensure that any TB8100 modules used to test the functionality of the PA Compatibility with TB8100 Modules under repair are loaded with compatible firmware.
Page 137: Board Replacement
We recommend that you dispose of faulty boards according to your local Disposing of Faulty Boards environmental and safety regulations. Otherwise, return them to your nearest CSO for appropriate disposal. TB8100 Service Manual Power Amplifier Fault Finding © Tait Electronics Limited September 2006...
Page 138: Initial Checks
Initial Checks You can use the TB8100 Service Kit and Calibration Kit to check the basic operation of the PA without removing the cover. To check whether the PA powers up correctly and generates any alarms, carry out Task Task...
Page 139 If it is not, go to Step Check that the system control bus is undamaged and correctly connected (refer to the TB8100 Installation and Operation Manual for details [MBA-00005-xx]). Check that the I C current source for the system control bus is present.
Page 140: Figure 8.5 Connections On The Fan Contact Board
N-type connector is correctly soldered (refer to “Visual Inspection” on page 144) check the directional coupler (refer to “Low Pass Filter and Directional Coupler Board” on page 165. Power Amplifier Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 141 If they are not correct, reprogram the correct details into the PA using the Calibration Kit (this requires a dongle) and then recalibrate the PA. Driver Current High Go to “6W Board” on page 155. TB8100 Service Manual Power Amplifier Fault Finding © Tait Electronics Limited September 2006...
Page 142 162. If it is not, go to Step If the alarm threshold and PA temperature are correct and the alarm is still present, go to “60W Board” on page 162. Power Amplifier Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 143 Tests) to make the fan run. Note also that the reading displayed for a 100W PA may be slightly high, due to the location of the temperature sensor board in the heatsink airflow. TB8100 Service Manual Power Amplifier Fault Finding © Tait Electronics Limited September 2006...
Page 144: Visual Inspection
Refer to “Replacing the Low Pass Filter/ Directional Coupler Board” on page 188 for a description of mounting and soldering the N-type connector. Power Amplifier Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 145 (e.g. overvoltage). Check the DC supply to the 6W board. Check the DC supply to the 60W board, including the ground connection TB8100 Service Manual Power Amplifier Fault Finding © Tait Electronics Limited September 2006...
Page 146: Figure 8.6 Visual Inspection Points For A 28V Pa
Figure 8.6 Visual inspection points for a 28V PA VHF (C-band) 100W PA shown 100W 5/50W Power Amplifier Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 147: Figure 8.7 Additional Visual Inspection Points For A 12V Pa
Figure 8.7 Additional visual inspection points for a 12V PA VHF (B-band) PA shown TB8100 Service Manual Power Amplifier Fault Finding © Tait Electronics Limited September 2006...
Page 148: Control Board
PC is connected to the control panel, run the Serv- ice Kit and connect to the base station, then power up the base sta- tion. Refer to TN-1142-AN for full Ethernet connection details. Power Amplifier Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 149: Figure 8.8 Recommended Test Equipment Set-Up For Circuit Board Checks - 28V Pa
Recommended test equipment set-up for circuit board checks - 28V PA connected within subrack Reciter Subrack Interconnect Board system control bus Control Panel RS-232 system interface 10-32VDC RF Power Meter Load TB8100 Service Manual Power Amplifier Fault Finding © Tait Electronics Limited September 2006...
Page 150: Figure 8.9 Recommended Test Equipment Set-Up For Circuit Board Checks - 12V Pa
12V PA 12.5VDC 10-32VDC RF Power Meter 12V PA DC input connector The matching socket for this connector is available as part number 240-00022-11 Load (Phoenix MVSTBR2.5HC/2-ST/5.08 female). Power Amplifier Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 151 7. If it is 0V, replace the control board. If it is greater than 0V, but less than 3.37V (typical), go to “6W Board” on page 155. TB8100 Service Manual Power Amplifier Fault Finding © Tait Electronics Limited September 2006...
Page 152 155. If it is 0V, replace the control board. If it is greater than 0V, but less than 4V (typical), go to “60W Board” on page 162. 1. X = final 1 or final 2. Power Amplifier Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 153: Figure 8.10 Location Of Test Points On The Control Board
Figure 8.10 Location of test points on the control board SK108 TP102 TP103 TP100 SK106 TP206 SK105 TP204 SK107 SK104 TP211 SK103 SK102 SK101 TB8100 Service Manual Power Amplifier Fault Finding © Tait Electronics Limited September 2006...
Page 154 Measured when the PA is set to its rated RF output power (i.e. 5W, 50W, or 100W according to model). b. X = final 1 or final 2. Power Amplifier Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 155: Board
Figure 8.11 Location of test points on the 6W board C100 TP206 L100 TP101 TP100 gate Q103 drain D200 P200 SK101 SK102 SK103 board shown is B/C band TB8100 Service Manual Power Amplifier Fault Finding © Tait Electronics Limited September 2006...
Page 156 4 of the control board connector. If it is, replace the 6W board. If it is not, replace the control board and go to Task Power Amplifier Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 157 Measure the voltage at TP101. The voltage should be between 2.9V and 3.4V. If it is, go to Step 8. If it is not, and the control board is not faulty, replace the 6W board. TB8100 Service Manual Power Amplifier Fault Finding © Tait Electronics Limited September 2006...
Page 158 Check that the RF input power from the reciter is greater than +9dBm. If it is, replace the 6W board. If it is not, check the reciter and repeat the test. Power Amplifier Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 159 = measured voltage ÷ 2 driver current <0.05V DRIVER-BIAS-CONT <0.05V typical analogue voltage +10V-SWITCHED-CONT 0.05V 10V regulated supply to 6W board TP101 DRIVER-BIAS-CONT 2.9V to 3.4V TP206 PIN-BIAS 2V to 2.5V TB8100 Service Manual Power Amplifier Fault Finding © Tait Electronics Limited September 2006...
Page 160: Splitter And Combiner Boards (100W Pa Only)
Check that there is no DC short to ground on each of the four ports. If there is a short, replace the splitter board. If there is not, go to Step Power Amplifier Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 161 “60W Board” on page 162. If it is not, replace the termination resistor and repeat the test (refer to “Replacing the Splitter/ Combiner Boards” on page 190). TB8100 Service Manual Power Amplifier Fault Finding © Tait Electronics Limited September 2006...
Page 162: Board
Figure 8.13 Location of test points on the 60W board P102 drain Q103 gate SK100 SK101 board shown is B/C band Power Amplifier Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 163 FINAL-BIAS voltage ramps from 0V to 5V during calibration. If it does, replace the 60W board. If it does not, replace the control board and go to Task TB8100 Service Manual Power Amplifier Fault Finding © Tait Electronics Limited September 2006...
Page 164 1.25V to 2.25V typical voltage when transmitting at rated power; current = measured voltage × 2 final bias 3.5V to 3.8V typical voltage when keyed on Power Amplifier Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 165: Low Pass Filter And Directional Coupler Board
Measure the forward power analogue voltage at TP101 (or pin 1 of SK100). The voltage should be greater than 0.27V. If it is, go to Step 7. If it is not, replace the LPF/directional coupler board. TB8100 Service Manual Power Amplifier Fault Finding © Tait Electronics Limited September 2006...
Page 166: Figure 8.14 Location Of The Test Points And Input Coupling Components On The Lpf/Directional Coupler Board
B, C, H, and K bands: C109 B, C, H, and K bands: C110 L band: R138 and R139 L band: R145 and R146 TP105 TP101 TP102 TP103 TP104 Power Amplifier Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 167 LPF/ directional coupler board TP105 ground a. Measured when the PA is set to its rated RF output power (i.e. 5W, 50W, or 100W according to model). TB8100 Service Manual Power Amplifier Fault Finding © Tait Electronics Limited September 2006...
Page 168: Boost Regulator Board (12V Pa Only)
- 28V PA” on page 134. Run the Service Kit and connect to the base station. 1. 0.5V lower than the input voltage. Power Amplifier Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 169: Figure 8.15 Test Equipment Set-Up For The Boost Regulator Board
Figure 8.15 Test equipment set-up for the boost regulator board Boost Regulator Board 12.5VDC 12V PA Figure 8.16 Location of test points on the boost regulator board TB8100 Service Manual Power Amplifier Fault Finding © Tait Electronics Limited September 2006...
Page 170: Final Tasks
Service Centre, and level-2 service centres should return the PA to the International Service Centre. Supply details of the customer, the fault and, if applicable, the attempted repair. Power Amplifier Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 171 Note The information in this table is extracted from the TB8100 Spec- ifications Manual. Refer to the latest issue of this manual (MBA-00001-xx) for the most up-to-date and complete specifi- cations. Table 8.6 Supply current specifications Test Limits Supply Current - 12V PA...
Page 173: Power Amplifier Disassembly And Reassembly
RF components or tracks in the PA while it is transmitting. Caution The TB8100 power amplifier (PA) weighs between 4.8kg (10.6lb) and 5.8kg (12.8lb). Take care when handling the PA to avoid personal injury. Important This equipment contains devices which are susceptible to damage from static charges.
Page 174: Screw Torque Settings
Remove the two M3 Torx screws securing the N-type connector to the cover Carefully lift the cover straight up off the heatsink, being careful not to put any strain on the N-type connector. Power Amplifier Disassembly and Reassembly TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 175: Figure 9.1 Removing The Airflow Duct And Cover
Figure 9.1 Removing the airflow duct and cover x3 on other side TB8100 Service Manual Power Amplifier Disassembly and Reassembly © Tait Electronics Limited September 2006...
Page 176: Removing The Front Panel
Remove the M3 Torx screws securing the front panel to the heatsink and remove the panel. Figure 9.2 Removing the front panel 28V PA 12V PA 12V PA Power Amplifier Disassembly and Reassembly TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 177: Refitting The Front Panel
Slide the airflow duct into place on the heatsink and secure with the Airflow Duct (100W PA Only) M3 Torx screws. Secure the DC input cable to the airflow duct with the P-clip and M3 Torx screw TB8100 Service Manual Power Amplifier Disassembly and Reassembly © Tait Electronics Limited September 2006...
Page 179: Power Amplifier Board Replacement
17 for more information on antistatic procedures when handling these devices. The TB8100 PA is a modular design with the circuitry divided between separate circuit boards which are assembled in different configurations in different models. This chapter provides information on how to remove and replace individual boards.
Page 180: Circuit Board Connecting Links
The exact number and location of links may differ in other models. Remove the cover and front panel. Removal Remove the bridging links connecting the board to the control board. Power Amplifier Board Replacement TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 181: Figure 10.2 Replacing The 6W Board
Then tighten the M3 Torx screws to the correct torque. Refit the front panel and cover. Figure 10.2 Replacing the 6W board TB8100 Service Manual Power Amplifier Board Replacement © Tait Electronics Limited September 2006...
Page 182: Replacing The 60W Board
Apply a thin layer of fresh heatsink compound to the bottom of the transistor. Use as little as possible, while still covering the whole of the mounting area of the transistor. Power Amplifier Board Replacement TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 183: Figure 10.3 Replacing The 60W Board
Fit the new RF power transistor as described in the “Refitting” section of “Replacing the 60W RF Power Transistor” on page 184. Refit the cover. Figure 10.3 Replacing the 60W board ensure correct orientation when refitting TB8100 Service Manual Power Amplifier Board Replacement © Tait Electronics Limited September 2006...
Page 184: Replacing The 60W Rf Power Transistor
Apply a small amount of heatsink compound (Dow-Corning 340 or equivalent) to the transistor mounting surface. Use as little as possible Power Amplifier Board Replacement TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 185: Figure 10.4 Replacing The 60W Rf Power Transistor
PCB. Retorque the 4–40 UNC screws after eight hours of operation. Refit the cover. Figure 10.4 Replacing the 60W RF power transistor TB8100 Service Manual Power Amplifier Board Replacement © Tait Electronics Limited September 2006...
Page 186: Replacing The Control Board
Before tightening the screws, press the board down over the locat- ing pins so that it is firmly seated against the heatsink. Then tighten the M3 Torx screws to the correct torque. Power Amplifier Board Replacement TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 187: Figure 10.5 Replacing The Control Board
PA output power a. To reprogram this information into the PA, you will need to use a dongle with the Cal- ibration Kit. TB8100 Service Manual Power Amplifier Board Replacement © Tait Electronics Limited September 2006...
Page 188: Replacing The Low Pass Filter/Directional Coupler Board
Refit the board onto the heatsink, ensuring it is correctly positioned Refitting on the locating pins. Secure the board to the heatsink with the M3 Torx screws and tighten to the correct torque. Power Amplifier Board Replacement TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 189: Figure 10.6 Replacing The Lpf/Directional Coupler Board
If you have to remove the tab, cut it off cleanly with a sharp cut- ting tool (such as tin snips or a guillotine). Figure 10.6 Replacing the LPF/directional coupler board 100W PA 5W and 50W PA TB8100 Service Manual Power Amplifier Board Replacement © Tait Electronics Limited September 2006...
Page 190: Replacing The Splitter/Combiner Boards
Remove the M3 Torx screws (and M2 Pozidriv on VHF PAs) securing the board to the heatsink. Carefully lift the board directly upwards off the locating pins remove it from the heatsink. Power Amplifier Board Replacement TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 191: Figure 10.7 Replacing The Splitter/Combiner Boards
Place the resistor on the heatsink and ensure the tab is flush with the surface of the PCB. TB8100 Service Manual Power Amplifier Board Replacement © Tait Electronics Limited September 2006...
Page 192: Replacing The Interconnect Boards
Before tightening the screws, press the board down over the locat- ing pins so that it is firmly seated against the heatsink. Then tighten the M3 Torx screws to the correct torque. Power Amplifier Board Replacement TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 193: Replacing The Boost Regulator Board In A 12V Pa
Reconnect the 12VDC and 28VDC output cables. If necessary, check the board is working correctly (refer to “Boost Regulator Board (12V PA Only)” on page 168). TB8100 Service Manual Power Amplifier Board Replacement © Tait Electronics Limited September 2006...
Page 194: Figure 10.8 Replacing The Boost Regulator Board In A 12V Pa
Refit the cover. Figure 10.8 Replacing the boost regulator board in a 12V PA Power Amplifier Board Replacement TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 195: Power Amplifier Spare Parts
Power Amplifier Spare Parts This chapter lists the spare parts available for the TB8100 PA at the time this manual was published. Spare circuit board assemblies are listed in Table 11.1. Replacement components are listed in Table 11.2 on page 196.
Page 196 Table 11.2 Replacement components for the PA Description 60W board final transistor (MRF9060) 000-10090-60 splitter board termination resistor (heatsink mounting) 039-50500-00 combiner board termination resistor 039-00100-50 Power Amplifier Spare Parts TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 197: Figure 11.1 Pa Mechanical Assembly - 28V Pas
Description Note: DC input feedthrough capacitor 012-04100-07 The characters XX in an IPN (Tait Internal Part Number) stand for the issue number of the part. Only the latest DC power link 051-00640-XX issue of each part will normally be available for ordering...
Page 198: Figure 11.2 Pa Mechanical Assembly - 12V Pas
349-02065-XX boost regulator board Note: The characters XX in an IPN (Tait Internal Part Number) stand for the issue number of the part. Only the latest issue of each part will normally be available for ordering as spare or replacement parts.
Page 199: Figure 11.3 Pa Mechanical Assembly - Covers And Airflow Duct
M3x10mm pan head Torx Taptite screw 349-02066-XX Note: The characters XX in an IPN (Tait Internal Part Number) stand for the issue number of the part. Only the latest issue of each part will normally be available for ordering as spare or replacement parts.
Page 201: Power Management Unit Circuit Description
Description The TB8100 power management unit (PMU) provides stable, low-noise 28VDC outputs to power the TB8100 base station. The PMU is made up of a number of individual boards and cards which comprise two main modules, the AC module and the DC module. The auxiliary power supply board is optional.
Page 202: Figure 12.1 Pmu High Level Block Diagram
12/24/48V 12/24/48V Filter Control Card Card DC O/P DC O/P Standby Auxiliary 13.65/27.3/54.6V 13.65/27.3/54.6V Power Supply Power Supply Card Board* DC Converter Board Control Card *optional Power Management Unit Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 203: Microprocessor Control Circuitry
Figure 12.2 on page 204 shows the control signal and power connections to and from the microprocessor. These are described in more detail in the paragraphs which follow. TB8100 Service Manual Power Management Unit Circuit Description © Tait Electronics Limited September 2006...
Page 204: Figure 12.2 Pmu Microprocessor Functional Block Diagram
“Standby Power Supply” below for details on deep sleep mode. 1. A type of “sleep” mode available when the standby power supply card is not fitted. Power Management Unit Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 205 C Communications and the other base station modules. The current source used by the I C lines as active pull-up resistors is housed on the microprocessor board. TB8100 Service Manual Power Management Unit Circuit Description © Tait Electronics Limited September 2006...
Page 206: Ac Module
400VDC output. This stage is fully protected from overload and short circuit by the power supply control circuitry. Power Management Unit Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 207 AC and DC modules and is fitted to all PMU models. The microprocessor controls the output voltage to the fan via a MOSFET and dropping resistor to provide the 24VDC output. TB8100 Service Manual Power Management Unit Circuit Description © Tait Electronics Limited September 2006...
Page 208: Dc Module
DC Power 12/24/48V Converter Protection (DCDC) Control & Monitor Interface to DC Control AC Module Battery Control DC O/P Standby Auxiliary 13.65/27.3/54.6V Power Power Supply Supply* *optional Power Management Unit Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 209 If the voltage is within the specified range, power is supplied to the control circuitry and standby power supply (if fitted). Protection is provided against the wrong input voltage being supplied. TB8100 Service Manual Power Management Unit Circuit Description © Tait Electronics Limited September 2006...
Page 210 The main function of this power supply is to provide a controlled 13.65VDC, 27.3VDC or 54.6VDC output (depending on model), as the main output for the TB8100 base station is 28VDC. This interface consists of the connectors which connect the DC module to...
Page 211: Figure 12.5 Identifying The Circuitry In The Ac Module
In order to show as much of the circuitry as possible in the photograph, the heatsinks and the components normally attached to them are not fitted, and the plug-in cards are not plugged in. TB8100 Service Manual Power Management Unit Circuit Description © Tait Electronics Limited September 2006...
Page 213: Figure 12.6 Identifying The Circuitry In The Dc Module
In order to show as much of the circuitry as possible in the photograph, the heatsinks and the components normally attached to them are not fitted, and the plug-in cards are not plugged in. 12V DC module shown TB8100 Service Manual Power Management Unit Circuit Description © Tait Electronics Limited September 2006...
Page 215: Power Management Unit Fault Finding
DC or AC module. The fault finding procedures provided in this chapter assume you are familiar with the operation of the TB8100 Service Kit and Calibration Kit. Figure 13.1 on page 218 identifies the individual boards and cards, and shows how they are configured in an AC and DC PMU.
Page 216: Safety Precautions
This equipment contains devices which are susceptible to damage from static charges. Refer to “ESD Precautions” on page 17 for more information on antistatic procedures when handling these devices. Power Management Unit Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 217: Identifying The Pmu
This explanation of PMU product codes is not intended to suggest that any combination of features is necessarily available in any one PMU. Consult your nearest Tait Dealer or Customer Service Organisation (CSO) for more information regarding the availabil- ity of specific models and options.
Page 218: Figure 13.1 Identifying The Boards And Cards In The Pmu
DC converter board DC converter board bottom view HVDC control and microprocessor card DC control card AC converter board AC and DC PMU shown Power Management Unit Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 219: Test Equipment
13.3 Test Equipment The following test equipment is required for carrying out the PMU fault finding procedures: PC with the latest version of the TB8100 Service Kit (refer to “Software and Firmware Compatibility” on page 220). Note The Calibration Kit is also installed when you install the Service Kit.
Page 220: Software And Firmware Compatibility
PMU’s firmware version. The new firmware may not be compatible with the other modules in the customer’s base station. Ensure that any TB8100 modules used to test the functionality of the PMU Compatibility with TB8100 Modules under repair are loaded with compatible firmware.
Page 221: Board Replacement
We recommend that you dispose of faulty boards and modules according to Disposing of Faulty Boards and Modules your local environmental and safety regulations. Otherwise, return them to your nearest CSO for appropriate disposal. TB8100 Service Manual Power Management Unit Fault Finding © Tait Electronics Limited September 2006...
Page 222: Initial Checks
13.6 Initial Checks You can use the TB8100 Service Kit to check the basic operation of the PMU without removing the covers. To check whether the PMU powers up correctly, produces the correct output power, or generates any alarms, carry out...
Page 223: Figure 13.3 Location Of Indicator Leds And Dc Output Connectors
Step 6. If the auxiliary output volt- age is wrong or not present, go to “Auxiliary Power Supply Board” on page 229. TB8100 Service Manual Power Management Unit Fault Finding © Tait Electronics Limited September 2006...
Page 224 240, depending on which module is faulty. If the PA output voltage is correct, and the auxiliary output voltage is incorrect, go to “Auxiliary Power Supply Board” on page 229. Power Management Unit Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 225 “DC Module” on page 230 (on 300ms, (on 300ms, off 4700ms) off 4700ms) flashing flashing Service Kit LED test - LEDs flash ––– (3Hz) (3Hz) alternately TB8100 Service Manual Power Management Unit Fault Finding © Tait Electronics Limited September 2006...
Page 226 If the alarm is still present, replace the AC module, check the DC power ground to the reciter, then retest. If the alarm is still present, return the PMU to your nearest CSO. Power Management Unit Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 227: Figure 13.4 Connections On The Fan Contact Board
PFC control card and return to Task If the fault is still present after retesting, replace the AC module. TB8100 Service Manual Power Management Unit Fault Finding © Tait Electronics Limited September 2006...
Page 228 If it is not, go to Step Select Monitor > Module Details > Power Management to determine which module is faulty and replace that module. Power Management Unit Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 229: Auxiliary Power Supply Board
27.3VDC ±2% 54.6VDC ±2% If the Service Kit test fails, or if the output voltage is wrong or not present, replace the auxiliary power supply board. TB8100 Service Manual Power Management Unit Fault Finding © Tait Electronics Limited September 2006...
Page 230: Dc Module
[49VDC] for the DC converter to start. 1. The card remover is included in the TBA0ST2 tool kit, which is available from your nearest Tait Dealer or Customer Service Organisation. It is also available separately as part number 220-02034-01. Power Management Unit Fault Finding TB8100 Service Manual ©...
Page 231: Figure 13.5 Checking The Dc Converter Without Microprocessor Control
DC control card components normally attached to them are not fitted, and the plug-in cards are not plugged in. TB8100 Service Manual Power Management Unit Fault Finding © Tait Electronics Limited September 2006...
Page 232: Figure 13.6 Location Of Test Point On The Battery Control Card
If the voltage is still incorrect after replacing the card, go to Task Figure 13.6 Location of test point on the battery control card bottom side of card shown Power Management Unit Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 233: Figure 13.7 Location Of Test Points On The Dc Control Card
If this second DC converter works correctly, the DC converter under test is faulty. Fit a new DC module to the PMU under test, reassemble the PMU, and go to “Final Tasks” on page 247. TB8100 Service Manual Power Management Unit Fault Finding © Tait Electronics Limited September 2006...
Page 234: Dc Converter With Microprocessor Control
There is a hole in the PCB beside pin 1 of the connector. If the ribbon cable is not faulty, go to Task Power Management Unit Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 235: Figure 13.8 Checking The Dc Converter With Microprocessor Control
In order to show as much of the circuitry as possible in the photograph, the heatsinks and the components normally attached to them are not fitted, and the plug-in cards are not plugged in. TB8100 Service Manual Power Management Unit Fault Finding © Tait Electronics Limited September 2006...
Page 236 3. If they do, go to “AC Module” on page 240. If the PMU is not fitted with an AC module, go to “Final Tasks” on page 247. Power Management Unit Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 237: Pmu Operation On Dc Input
247. 13.8.3 PMU Operation on DC Input This section is a copy of the section that is published in the TB8100 Installation and Operation Manual. It is reproduced in this manual for your convenience. The operation of the PMU on DC input is controlled by three sets of...
Page 238: Figure 13.9 Pmu Alarm Thresholds And Voltage Limits When Operating On Dc
Figure 13.9 PMU alarm thresholds and voltage limits when operating on DC Power Management Unit Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 239 17.1V ±0.3V 34.2V ±0.5V 68.4V ±1V a. The information in this table is extracted from the TB8100 Specifications Manual. Refer to the latest issue of this manual (MBA-00001-xx) for the most up-to-date and complete PMU specifications. b. Using the Service Kit.
Page 240: Ac Module
1. The card remover is included in the TBA0ST2 tool kit, which is available from your nearest Tait Dealer or Customer Service Organisation. It is also available separately as part number 220-02034-01. Power Management Unit Fault Finding TB8100 Service Manual ©...
Page 241: Figure 13.10 Location Of Test Points On The Ac Converter Board
“Final Tasks” on page 247. Figure 13.10 Location of test points on the AC converter board Q306 Q305 400VDC bus Q202 Q201 bottom side of board shown TB8100 Service Manual Power Management Unit Fault Finding © Tait Electronics Limited September 2006...
Page 242 17VDC. If the relay clicks, set the control input voltage to 15VDC and go to Task 4. If it does not, replace the AC module and go to “Final Tasks” on page 247. Power Management Unit Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 243: Figure 13.11 Ac Converter Test Equipment Set-Up
*If you want to use the matching plug for this connector, the details are as follows: plug: IPN 240-00022-07 ( JST VLP-03V crimp socket: IPN 240-00022-00 ( JST SVF-61T-P2.0 TB8100 Service Manual Power Management Unit Fault Finding © Tait Electronics Limited September 2006...
Page 244: Figure 13.12 Typical Gate-Source And Drain-Source Waveforms For Fets
If the oscilloscope is not floating, do not test the gate-to-source signal of Q201. Figure 13.12 Typical gate-source and drain-source waveforms for FETs Q305 and Q306 Q201 and Q202 Power Management Unit Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 245 34% ±10%. If the efficiency is within the limits, go “Final Tasks” on page 247. If it is outside the limits, replace the AC module and go to “Final Tasks” on page 247. TB8100 Service Manual Power Management Unit Fault Finding © Tait Electronics Limited September 2006...
Page 246: 13.10 Modifying The Pfc Control Card
Connect a 2k2Ω resistor between pin 10 and pin 11 of IC102. Figure 13.13 Modifying the PFC control card for testing the AC converter 10 11 Power Management Unit Fault Finding TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 247: 13.11 Final Tasks
Accredited Service Centre, and level-2 service centres should return the PMU to the International Service Centre. Supply details of the customer, the fault and, if applicable, the attempted repair. TB8100 Service Manual Power Management Unit Fault Finding © Tait Electronics Limited September 2006...
Page 249: Power Management Unit Disassembly And Reassembly
Take care when working on a PMU that has been in recent use. Caution The PMU can weigh up to 6.4kg (14.1lb). Take care when handling the PMU to avoid personal injury. TB8100 Service Manual Power Management Unit Disassembly and Reassembly © Tait Electronics Limited September 2006...
Page 250: Equipment Safety
Power Management Unit Disassembly and Reassembly TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 251: Mechanical Overview
14.2 Mechanical Overview The TB8100 PMU is made up of a number of individual boards and cards which comprise two main modules, the AC module and the DC module. The auxiliary power supply board is optional. The PMU is available in three main hardware configurations:...
Page 252: Screw Torque Settings
Turn the PMU over and remove the four M3 Torx screws securing the bottom cover to the front and rear panels. Lift off the bottom cover. Power Management Unit Disassembly and Reassembly TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 253: Removing The Front And Rear Panels
Loosen the rear panel slightly and remove the fibreglass DC input insulator from behind the DC input terminals. Slide the rear panel off the heatsinks. Figure 14.1 Removing the front and rear panels TB8100 Service Manual Power Management Unit Disassembly and Reassembly © Tait Electronics Limited September 2006...
Page 254: Disconnecting The Ac And Dc Modules
Make sure that none of the cables is pinched between the modules and/or shield. Reconnect the 12-way ribbon cable to the DC converter board. Power Management Unit Disassembly and Reassembly TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 255: Figure 14.2 Disconnecting The Ac And Dc Modules
Figure 14.2 Disconnecting the AC and DC modules AC module DC module TB8100 Service Manual Power Management Unit Disassembly and Reassembly © Tait Electronics Limited September 2006...
Page 256: Figure 14.3 Reconnecting The Ac And Dc Modules
Figure 14.3 Reconnecting the AC and DC modules Power Management Unit Disassembly and Reassembly TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 257: Refitting The Front And Rear Panels
Refit and tighten the M4 Torx screw grounding the rear panel to the AC converter board. TB8100 Service Manual Power Management Unit Disassembly and Reassembly © Tait Electronics Limited September 2006...
Page 258: Refitting The Top And Bottom Covers
Push the top cover down firmly and secure with the four M3 Torx screws. Note Both the top and bottom covers are symmetrical and can be fitted in either orientation. Power Management Unit Disassembly and Reassembly TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 259: Power Management Unit Card And Board Replacement
Take care when working on a PMU that has been in recent use. Caution The PMU can weigh up to 6.4kg (14.1lb). Take care when handling the PMU to avoid personal injury. TB8100 Service Manual Power Management Unit Card and Board Replacement © Tait Electronics Limited September 2006...
Page 260: Equipment Safety
The colours used are as follows: 12VDC – green 24VDC – yellow 48VDC – red. Power Management Unit Card and Board Replacement TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 261: Replacing The Plug-In Cards
Figure 15.1. 1. The card remover is included in the TBA0ST2 tool kit, which is available from your nearest Tait Dealer or Customer Service Organisation. It is also available separately as part number 220-02034-01. TB8100 Service Manual Power Management Unit Card and Board Replacement...
Page 262 “click” when each plug is fully inserted. On the longer HVDC and microprocessor card, you may need to use both hands to press evenly along its length. Refit the front panel and covers as necessary. Power Management Unit Card and Board Replacement TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 263: Figure 15.1 Replacing The Plug-In Cards
Figure 15.1 Replacing the plug-in cards TB8100 Service Manual Power Management Unit Card and Board Replacement © Tait Electronics Limited September 2006...
Page 264 To reprogram this information into the PMU, you will need to use a dongle with the Calibration Kit. There is no need for any recalibration when any of the plug-in cards is fitted, removed or replaced. Power Management Unit Card and Board Replacement TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 265: Replacing The Auxiliary Power Supply Board
Position the board as shown in Figure 15.2 and secure with the two Refitting M4 Torx screws Reconnect the loom Replace the rear panel and top and bottom covers. TB8100 Service Manual Power Management Unit Card and Board Replacement © Tait Electronics Limited September 2006...
Page 266 To reprogram this information into the PMU, you will need to use a dongle with the Calibration Kit. There is no need for any recalibration when this board is fitted, removed or replaced. Power Management Unit Card and Board Replacement TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 267: Power Management Unit Spare Parts
Power Management Unit Spare Parts This section lists the spare parts available for the TB8100 PMU at the time this manual was published. Spare modules and circuit board assemblies are listed in Table 16.1. Mechanical parts are listed in Figure 16.1 on page 269 Figure 16.2...
Page 269 PMU mechanical assembly - sheet 1 Description Note: current transformer 053-00028-XX The characters XX in an IPN (Tait Internal Part Number) stand for the issue number of the part. Only the latest E-core choke 069-00010-40 issue of each part will normally be available for ordering...
Page 270: Figure 16.2 Pmu Mechanical Assembly - Sheet 2
(when 40W aux. PS board not fitted) 362-01122-XX Note: The characters XX in an IPN (Tait Internal Part Number) stand for the issue number of the part. Only the latest issue of each part will normally be available for ordering as spare or replacement parts.
Page 271: Control Panel Circuit Description
Control Panel Circuit Description The control panel is designed to be the link between the user and the TB8100 base station. The circuitry for the operation of the control panel is located on a board mounted behind its front face. All communication between the base station and the control panel is via the system control bus.
Page 272: Control Circuitry
The control panel is designed to work with an electret microphone with an input range of 80dBSPL to 115dBSPL. Control Panel Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 273: Power Save
The power supply for the cooling fan (if fitted) mounted on the front panel is fed through the control panel. TB8100 Service Manual Control Panel Circuit Description © Tait Electronics Limited September 2006...
Page 274: Figure 17.1 Standard, Dual Base Station, And Power Save Control Panel High Level
Full Power On System 28V, GND Power Control Control Bus Supply Panel Type Power Save On LEDs I C Bus Translation Fan Power & GND Fan Inputs Control Panel Circuit Description TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 275: Figure 17.2 Multi-Reciter Control Panel High Level Block Diagram
26-way D-range Fan Rotation Fixed Signal Lines Speaker Audio Channel Select V , GND Power Supply Reciter Counter Channel LED Control & Channel LEDs Channel LED Signalling Decoding TB8100 Service Manual Control Panel Circuit Description © Tait Electronics Limited September 2006...
Page 277: Control Panel Servicing
For the sake of simplicity and clarity, the instructions and illustra- tions in this chapter refer to a standard control panel. However, the same basic procedures and techniques apply to other models. TB8100 Service Manual Control Panel Servicing © Tait Electronics Limited September 2006...
Page 278: Identifying The Control Panel
Driver/ Location / Function Torque Spanner Size securing the circuit board 0.5N·m / 4.5lbf·in securing the D-range connector securing the speaker clamps 0.5N·m / 4.5lbf·in 5.5mm AF M3 Control Panel Servicing TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 279: Replacing The Circuit Board
Important Make sure the flexible connector is correctly positioned and latched in its socket, as shown in Figure 18.2 on page 281. Refit the volume knob. TB8100 Service Manual Control Panel Servicing © Tait Electronics Limited September 2006...
Page 280: Figure 18.1 Replacing The Control Panel Board
Figure 18.1 Replacing the control panel board Control Panel Servicing TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 281: Figure 18.2 Reconnecting The Flexible Connector
Figure 18.2 Reconnecting the flexible connector latch pushed fully down at both ends flexible connector inserted straight into socket TB8100 Service Manual Control Panel Servicing © Tait Electronics Limited September 2006...
Page 282: Replacing The Speaker
(refer to Figure 18.1 on page 280). Refit the board as described in “Replacing the Circuit Board” on page 279. Control Panel Servicing TB8100 Service Manual © Tait Electronics Limited September 2006...
Page 283: Figure 18.3 Replacing The Speaker
Figure 18.3 Replacing the speaker TB8100 Service Manual Control Panel Servicing © Tait Electronics Limited September 2006...
Page 284: Spare Parts
18.5 Spare Parts This section lists the spare parts available for the TB8100 control panel at the time this manual was published. Spare control panels and circuit board assemblies are listed in Table 18.1. Mechanical parts are listed in Figure 18.4 on page 285 Figure 18.5...
Page 285: Figure 18.4 Control Panel Mechanical Assembly - Standard, Power Save, And
* not fitted to Power Save control panel control panel board Note: The characters XX in an IPN (Tait Internal Part Number) stand for the issue number of the part. Only the latest issue of each part will normally be available for ordering as spare or replacement parts.
Page 286: Figure 18.5 Control Panel Mechanical Assembly - Multi-Reciter
Note: The characters XX in an IPN (Tait Internal Part Number) stand for the issue number of the part. Only the latest issue of each part will normally be available for ordering as spare or replacement parts.
Page 287 Subrack Servicing This chapter lists the spare parts available for the TB8100 subrack at the time this manual was published. Spare subrack assemblies are listed in Table 19.1. Mechanical parts and cables are listed as follows: Figure 19.1 on page 289...
Page 289: Figure 19.1 Front Panel Mechanical Assembly
354-01048-XX Note: The characters XX in an IPN (Tait Internal Part Number) stand for the issue number of the part. Only the latest issue of each part will normally be available for ordering as spare or replacement parts.
Page 290: Figure 19.2 Subrack Mechanical Assembly
362-01123-XX interconnect board Note: The characters XX in an IPN (Tait Internal Part Number) stand for the issue number of the part. Only the latest issue of each part will normally be available for ordering as spare or replacement parts.
Page 291: Figure 19.3 Cable Identification - Sheet 1
DC power cable - PMU to dual reciters 219-02860-XX Note: The characters XX in an IPN (Tait Internal Part Number) stand for the issue number of the part. Only the latest issue of each part will normally be available for ordering as spare or replacement parts.
Page 292: Figure 19.4 Cable Identification - Sheet 2
March 2005 Note: dual 5/50W base station - rear view The characters XX in an IPN (Tait Internal Part Number) stand for the issue number of the part. Only the latest issue of each part will normally be available for ordering as spare or replacement parts.
Page 293: Figure 19.5 Cables And Mechanical Parts Used In The Multi-Reciter Subrack
DC input terminal block (when no PMU fitted) 240-04030-03 Note: The characters XX in an IPN (Tait Internal Part Number) stand for the issue number of the part. Only the latest b c d issue of each part will normally be available for ordering as spare or replacement parts.
Page 295 Glossary This glossary contains an alphabetical list of terms and abbreviations related to the TB8100 base station. For information about trunking, mobile, or portable terms, consult the glossary provided with the relevant documentation. A B C D E F G H I K L N P R S T U V W...
Page 296 BCD (binary coded decimal) is a code in which a string of four binary digits represents a decimal number. The TB8100 Calibration Kit is a utility for defining the switching ranges of Calibration Kit the receiver and the exciter and for flattening the receiver response across its switching range.
Page 297 (complex baseband) to suit the DSP. De-emphasis is a process in the receiver that restores pre-emphasised audio de-emphasis to its original relative proportions. TB8100 Service Manual Glossary © Tait Electronics Limited September 2006...
Page 298 Duty cycle is used in relation to the PA. It is the proportion of time duty cycle (expressed as a percentage) during which the PA is operated. The TB8100 PA can be operated continuously. Electronic Industries Alliance. Accredited by the American National Standards Institute (ANSI) and responsible for developing telecommunications and electronics standards in the USA.
Page 299 Kerchunking is transmitting for a second or less without saying anything in kerchunking order to test the base station. This results in a ‘kerchunk’ sound. A TB8100 is a line-controlled base station when it receives audio (sending line-controlled base station it out via its system interface), transmits audio received over its system interface, and its transmitter is keyed via the Tx Key line.
Page 300 Pre-emphasis is a process in the transmitter that boosts higher audio pre-emphasis frequencies to improve the audio quality. The reciter is a module of a TB8100 base station that acts as receiver and reciter exciter. Reverse tone bursts can be used with CTCSS. When reverse tone bursts are...
Page 301 (signal + noise + distortion) to (noise + distortion). A SINAD of 12dB corresponds to a signal to noise ratio of 4:1. The TB8100 can provide an approximate SINAD value while in service by comparing the in- band audio against out-of-band noise.
Page 302 A TB8100 is a talk through repeater when its audio path is configured to Talk Through Repeater pass the audio it receives on to the transmitter. Task Manager is a part of the TB8100 base station firmware that carries out Task Manager tasks in response to inputs.
Page 303: Important Notice
MERGED INTO ANOTHER PROGRAM WILL AUTOMATICALLY AND WITHOUT NOTICE FROM CONTINUE TO BE SUBJECT TO THE TERMS AND TAIT IN THE EVENT THAT THE LICENSEE FAILS TO CONDITIONS OF THIS AGREEMENT COMPLY WITH ANY TERM OR CONDITION OF THE LICENSEE MAY NOT DUPLICATE...
Page 304: Limited Warranty
THAT SUBJECT ONLY TO ANY EXPRESS WRITTEN OR OTHERWISE AT LAW FOR ANY LOSSES OR TERMS OF AGREEMENT TO THE CONTRARY DAMAGES WHETHER GENERAL SPECIAL BETWEEN TAIT AND THE LICENSEE THIS IS THE EXEMPLARY PUNITIVE DIRECT INDIRECT OR COMPLETE AND EXCLUSIVE STATEMENT OF THE...
Page 305 Directiva 1999/5/CE. Veja também: http://eudocs.taitworld.com/ Español Svensk Por medio de la presente Tait Electronics Limited declara que el TBAB1, TBAC0 & Härmed intygar Tait Electronics Limited att TBAH0 cumple con los requisitos esenciales y denna TBAB1, TBAC0 & TBAH0 står I cualesquiera otras disposiciones aplicables o överensstämmelse med de väsentliga...

Tait TB8100 Service Manual

Preface

1 Safety and Servicing Information

2 Reciter Circuit Description

3 Reciter Fault Finding

4 Reciter Disassembly and Reassembly

5 Reciter Board Replacement

6 Reciter Spare Parts

7 Power Amplifier Circuit Description

8 Power Amplifier Fault Finding

9 Power Amplifier Disassembly and Reassembly

10 Power Amplifier Board Replacement

11 Power Amplifier Spare Parts

12 Power Management Unit Circuit Description

13 Power Management Unit Fault Finding

14 Power Management Unit Disassembly and Reassembly

15 Power Management Unit Card and Board Replacement

16 Power Management Unit Spare Parts

17 Control Panel Circuit Description

18 Control Panel Servicing

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Summary of Contents for Tait TB8100