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Motorola Commercial Series Service Information

Uhf2 (438-470mhz)
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Commercial Series
CP140/CP160/CP180
Portable Radios
UHF2 (438-470MHz)
Service Information
Issue: October 2004

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  • Page 1 Commercial Series CP140/CP160/CP180 Portable Radios UHF2 (438-470MHz) Service Information Issue: October 2004...
  • Page 2 Accordingly, any copyrighted Motorola computer programs contained in the Motorola products described in this manual may not be copied or reproduced in any manner without the express written permission of Motorola. Furthermore, the purchase of Motorola...

  • Page 3: Table Of Contents

    Table of Contents Chapter 1 MODEL CHART AND TECHNICAL SPECIFICATIONS 1.0 CP140/CP160/CP180 Model Chart ..............1-1 2.0 Technical Specifications ..................1-2 Chapter 2 THEORY OF OPERATION 1.0 Introduction ......................2-1 2.0 UHF2 (438-470MHz) Receiver ................2-1 2.1 Receiver Front-End ..................2-2 2.2 Receiver Back-End..................2-3 3.0 UHF2 (438-470MHz) Transmitter.................2-4 3.1 Transmitter Power Amplifier ................2-4 3.2 Antenna Switch....................2-4 3.3 Harmonic Filter ....................2-5...

  • Page 5: Model Chart And Technical Specifications

    Chapter 1 MODEL CHART AND TECHNICAL SPECIFICATIONS CP140/CP160/CP180 Model Chart CP140/CP160/CP180 Series, UHF2, 438-470 MHz Model Description MDH65RDC9AA2AN CP140, 438-470 MHz, 4 W, 16 Ch. Non-Display Model MDH65RDF9AA3AN CP160, 438-470 MHz, 4 W, 32 Ch. Limited Keypad Model MDH65RDH9AA4AN CP180, 438-470 MHz, 4 W, 64 Ch. Full Keypad Model Item Description PMUE1966_...

  • Page 6: Technical Specifications

    MODEL CHART AND TECHNICAL SPECIFICATIONS Technical Specifications Data is specified for +25°C unless otherwise stated. General UHF2 Frequency: 438-470 MHz Channel Capacity: 16, 32, or 64 Channels 7.5 Volts ±20% Power Supply: Dimensions with: High Capacity Li-Ion battery 130.5mm H x 62mm W x 45mm D NiMH FM, battery 130.5mm H x 62mm W x 45mm D NiMH Std battery...
  • Page 7 Technical Specifications Transmitter Specifications UHF2 RF Output High NiMH @ 7.5V: Frequency: 438-470 MHz Channel Spacing: 12.5/20/25 kHz Freq. Stability: 0.00025% (-30°C to +60°C) Spurs/Harmonics: -36 dBm < 1 GHz -30 dBm > 1 GHz Audio Response: +1, -3 dB (from 6 dB/oct.
  • Page 8 MODEL CHART AND TECHNICAL SPECIFICATIONS...

  • Page 9: Theory Of Operation

    Chapter 2 THEORY OF OPERATION Introduction This Chapter provides a detailed theory of operation for the UHF circuits in the radio. Schematic diagrams and board layout diagrams are included in Chapter 4 in this Section of the manual. UHF (438-470MHz) Receiver The UHF receiver covers the range of 438-470 MHz and provides switchable IF bandwidth for use with 20/25/30 kHz or 12.5 kHz channel spacing systems.

  • Page 10: Receiver Front-End

    THEORY OF OPERATION Receiver Front End Incoming RF signals from the antenna are first routed through the harmonic filter and antenna switch, part of the transmitter circuitry, before being applied to the receiver front end. The receiver front end consists of a preselector filter, RF amplifier, an interstage filter, and a double-balanced first mixer.

  • Page 11: Receiver Back-End

    UHF (438-470MHz) Receiver Receiver Back End The receiver back end is a dual conversion design. High IF selectivity is provided by FL51, a 4-pole fundamental mode 44.85 MHz crystal filter with a minimum 3 dB bandwidth of ±6.7 kHz, a maximum 20 dB bandwidth of + 12.5 kHz, and a maximum insertion loss of 3.5 dB.

  • Page 12: Transmitter Power Amplifier

    THEORY OF OPERATION UHF Transmitter The UHF transmitter covers the range of 438-470 MHz. Depending on model, the output power of the transmitter is either switchable on a per-channel basis between high power (4 watts) and low power (1 watt), or is factory preset to 2 watts. The transmitter is divided into four major blocks as shown in Figure 2-2.

  • Page 13: Harmonic Filter

    UHF Transmitter Harmonic Filter The harmonic filter consists of components C130-C136 and L130-L132. The harmonic filter is a seven-pole Chebychev low-pass configuration, optimized for low insertion loss, with a 3 dB frequency of approximately 600 MHz and typically less than 0.8 dB insertion loss in the passband. Antenna Matching Network The harmonic filter presents a 50Ω...
  • Page 14 THEORY OF OPERATION UHF Frequency Generation Circuitry The frequency generation system, shown in Figure 2-3, is composed of two circuit blocks, the Fractional-N synthesizer IC U201, the VCO/Buffer IC U251, and associated circuitry. Figure 2-4 shows the peripheral interconnect and support circuitry used in the synthesizer block, and Figure 2-5 details the internal circuitry of the VCOBIC and its interconnections to the surrounding components.

  • Page 15: Fractional-N Synthesizer

    UHF Frequency Generation Circuitry Fractional-N Synthesizer The Fractional-N synthesizer, shown in Figure 2-4, uses a 16.8 MHz crystal (Y201) to provide the reference frequency for the system. External components C201-C203, R202 and D201 are also part of the temperature-compensated oscillator circuit. The dc voltage applied to varactor D201 from U201 pin 25 is determined by a temperature-compensation algorithm within U201, and is specific to each crystal Y201, based on a unique code assigned to the crystal that identifies its temperature characteristics.

  • Page 16: Voltage Controlled Oscillator (Vco)

    THEORY OF OPERATION Voltage Controlled Oscillator (VCO) The VCOBIC (U251), shown in Figure 2-5, in conjunction with the Fractional-N synthesizer (U201) generates RF in both the receive and the transmit modes of operation. The TRB line (U251 pin 19) determines which oscillator and buffer are enabled. A sample of the RF signal from the enabled oscillator is routed from U251 pin 12 through a low pass filter, to the prescaler input of the synthesizer IC (U201 pin 32).

  • Page 17: Troubleshooting Tables

    Chapter 3 TROUBLESHOOTING TABLES This section contains detailed troubleshooting tables. These tables should be used as a guide in determining the problem areas. They are not a substitute for knowledge of circuit operation and astute troubleshooting techniques. It is advisable to refer to the related detailed circuit descriptions in the theory of operation sections prior to troubleshooting a radio.
  • Page 18 TROUBLESHOOTING TABLES Symptom Possible Causes Procedure Corrective Action No Audio 1. Synthesizer out of lock Verify U201-4 is at 3V dc. Troubleshoot synthesizer/VCO circuits. 2. Defective IFIC Verify audio is present at U51-8. Check Q70, Y70, U51. 3. RX audio buffer fault Verify audio is present at U451-2.

  • Page 19: Troubleshooting Table For Synthesizer

    Troubleshooting Table for Synthesizer Troubleshooting Table for Synthesizer Symptom Possible Causes Procedure Corrective Action Synthesizer Out of 1. VCO fault Verify oscillator is working, check RF Check VCO tank components Lock (RX mode level at U251-10 per schematic. connected to U251-5 and 6. only) Check dc voltages at U251 pin 2 Check for shorts/opens, replace...

  • Page 20: Troubleshooting Table For Transmitter

    TROUBLESHOOTING TABLES Troubleshooting Table for Transmitter Symptom Possible Causes Procedure Corrective Action No Transmit (no 1. PTT switch defective. Verify U401-71 goes low when PTT Replace PTT switch S441. TX LED indication) is pressed. 2. EXT MIC PTT fault Verify U401-72 goes low when J471- Check/replace Q470, L471 etc.
  • Page 21 Troubleshooting Table for Transmitter Symptom Possible Causes Procedure Corrective Action Poor TX range, 1. RF test jack defective Verify continuity of J140 pins 3 and 4 Replace J140. conducted power in RX mode only. 2. Antenna matching net- Visually inspect components C140- Repair/replace if necessary.

  • Page 22: Troubleshooting Table For Board And Ic Signals

    TROUBLESHOOTING TABLES Troubleshooting Table for Board and IC Signals IC Designator Pin Function DC Voltage Comments (Condition) RF input 44.85 MHz 1.20 IFIC RF input decoupling 1.20 2nd LO osc output 4.02 2nd LO osc input 4.60 RSSI output 0.74 (no received signal) 4.70 Audio feedback...
  • Page 23 Troubleshooting Table for Board and IC Signals IC Designator Pin Function DC Voltage Comments (Condition) U110 RF input (TX mode) RF Power Amp Vgg (gate bias) 2.65 (typ) (TX mode) 6.59 (TX mode) RF output Do not measure Ground U150 Unit 1 output 4.20 (typ) (TX mode)
  • Page 24 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U201 Ref osc XTAL2 Freq Synthesizer Ref osc warp output 3.00 Superfilter cap 4.48 Superfilter base (NU) 3.76 Superfilter output 4.52 Superfilter input 4.96 Prescaler input 1.97 Prescaler ground Prescaler Vdd 2.99 Prescaler Vref (NU) 1.97...
  • Page 25 Troubleshooting Table for Board and IC Signals IC Designator Pin Function DC Voltage Comments (Condition) U251 Prescaler output 2.26 VCO / Buffer TX switch output (NU) 0.06 Vcc_BUFFERS 3.00 TX VCO emitter (RX mode) TX VCO base (RX mode) GND_LOGIC Vcc_LOGIC 3.00 TRB input...
  • Page 26 3-10 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U401 PB1_ADDR9 3.05 Microprocessor PB2_ADDR10 0.16 3.23 PBO_ADDR8 3.05 PB5_ADDR13 0.13 PG1_XA14 0.20 PG4_XA17 3.17 PG5_XA18 PG3_XA16 3.21 PG2_XA15 0.30 PB4_ADDR12 0.22 PF7_ADDR7 3.03 PF6_ADDR6 3.08 PF5_ADDR5 3.06 PF4_ADDR4 0.16 PF3_ADDR3 0.26...
  • Page 27 Troubleshooting Table for Board and IC Signals 3-11 IC Designator Pin Function DC Voltage Comments (Condition) U401 PH1_PW2 3.00 Microprocessor PH0_PW1 3.23 Synth chip select XIRQ 3.00 1.48 RX enable 0.01 TX enable 3.23 Green LED enable Red LED enable 2.98 Lock detect from U201-4 MODB_VSTBY...
  • Page 28 3-12 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U401 PA3_IC4_OC5_OC1 3.00 Microprocessor PA4_OC4_OC1 Squelch detect input PA5_OC3_OC1 Channel activity input PA6_OC2_OC1 PA7_PA1_OC1 VSSR VDDR 3.23 ECLK (NU) 1.60 EXTAL 1.70 Clock from U451-28 XTAL 1.40 Not used VDDSYN XFC (NU) RESET...
  • Page 29 Troubleshooting Table for Board and IC Signals 3-13 IC Designator Pin Function DC Voltage Comments (Condition) U404 3.17 Flash ROM 0.30 0.22 3.03 3.08 3.06 0.24 3.08 3.05 3.05 0.69 0.94 1.08 0.78 0.59 0.66 0.67 0.75 EN_CE 3.01 From U401-38 0.16 EN_OE From U401-86...
  • Page 30 3-14 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U451 GCB1 general purpose output ASFIC_CMP GCB0 general purpose output 3.00 BW select (25 kHz mode) Squelch channel activity output To U401-84 Squelch detect digital output To U401-83 PL/low speed data I/O 1.50 High speed data I/O 3.00...
  • Page 31 Troubleshooting Table for Board and IC Signals 3-15 IC Designator Pin Function DC Voltage Comments (Condition) U480 Unit 1 output 2.48 Dual Opamp Unit 1 (-) input 2.48 Unit 1 (+) input 2.46 Ground Unit 2 (+) input 0.28 Unit 2 (-) input 0.29 Unit 2 output 4.96...
  • Page 32 3-16 TROUBLESHOOTING TABLES...
  • Page 33 Chapter 4 UHF2 PCB/SCHEMATICS/PARTS LISTS Allocation of Schematics and Circuit Boards UHF2 (438-470MHz) The UHF circuits are contained on the printed circuit board (PCB) which also contains the Controller circuits. This Chapter shows the schematics for the UHF circuits, the Controller circuits are contained in Section 2 of this manual.
  • Page 34 UHF2 PCB/SCHEMATICS/PARTS LISTS...

  • Page 35: Uhf2 Pcb 8486348Z13-C Schematic Diagrams

    UHF2 PCB 8486348Z13-C Schematic Diagrams UHF2 PCB 8486348Z13-C Schematic Diagrams D301 C488 C465 C458 R480 C454 S444 C513 C480 J471 R470 R473 R264 U451 R254 FL54 R496 L265 L255 C470 R253 C257 C267 C473 R481 C256 C302 R472 C489 C482 R522 L264 F301...
  • Page 36 UHF2 PCB 8486348Z13-C Schematic Diagrams C121 C124 R206 C206 C52 C53 D121 C220 C417 R416 R411 C136 U151 L121 C222 C134 C123 R434 L140 R502 R433 C122 R432 C135 C221 FL51 R150 R501 C223 L132 L141 C131 C224 C157 C158 R151 SH200 R154...
  • Page 37 UHF2 PCB 8486348Z13-C Schematic Diagrams UHF R2 USWB+ USWB+ USWB+ USWB+ TX_ENA TX_ENA PWR_SET TX_UHF_R2 PWR_SET DEMOD DEMOD RX_FE_UHF_R2 RX_BE BW_SEL BW_SEL IF_IN IF_OUT RX_IN RX_OUT CONTROLLER TX_INJ RSSI RSSI RX_INJ MOD_OUT MOD_IN PRESC PRESC 16_8_MHZ 16_8_MHZ RX_INJ SYNTH_UHF_R2 V_STEER V_STEER VCO_UHF_R2 SYNTH_CS...
  • Page 38 UHF2 PCB 8486348Z13-C Schematic Diagrams FE_5R 5.6K UHF R2 Front End 390pF SH40 SHIELD SHIELD UMT1 390pF 390pF 22nH 5.6K 0.1uF C521 4.2V C523 1.5K FE_IF_OUT 390pF 5.1pF C522 0.45pF IF_OUT 680nH 9.1pF 6.7% 6.2pF 7.5pF 5.1pF 8.2pF 0.5pF 0.79V RX_IN 1.6% 1.3%...
  • Page 39 UHF2 PCB 8486348Z13-C Schematic Diagrams RX Back End (Overtone) U52-1 FL53 TC7W04F CFWC455E 0.1uF OUT 2 U52-2 100K TC7W04F IF_BAND_SEL 5V for 25kHz BW_SE L 0V for 12.5kHz 0.1uF FL54 CFWC455G 1 IN 47pF U52-3 3.3K SH50 SH52 TC7W04F SHIELD SHIELD U52-4 2.4K...
  • Page 40 UHF2 PCB 8486348Z13-C Schematic Diagrams UHF R2 Synthesizer FN_V_SF 4.5V V_SF SH200 SH201 SHIELD SHIELD C233 C231 C232 R230 R247 1000pF 0.1uF 4.7uF FN_LOCK LOCK WARP 25 LOCK: 3V C204 INDMULT 16 UNLOCK: 0V SFOUT 28 470pF ADAPTSW 46 CCOMP LOCK IADAPT 45 FN_V_STEER...
  • Page 41 UHF2 PCB 8486348Z13-C Schematic Diagrams UHF R2 VCO V_SF VCO_VSF L270 R273 R277 4.5V V_S F 220nH C292 C274 C270 C285 R284 L282 390pF 0.1uF VCO_3V 15nH 390pF 0.1uF L272 220nH SH250 SH251 SH253 SHIELD SHIELD SHIELD C272 L292 0.1uF 15nH C273 R271...
  • Page 42 UHF2 PCB 8486348Z13-C Schematic Diagrams 4-10 UHF R2 Tx PA_USWB+ USWB+ PA_TX_EN A TX_ENA C170 390pF Q171 Q170 EMB10 C171 390pF SH100 SHIELD C157 C154 R152 0.1uF 390pF 100K C155 R158 C151 R153 U151 100K 1.5K 390pF C150 0.1uF C156 57R01 390pF Q150...

  • Page 43: Uhf2 Pcb 8486348Z13-C Parts List

    UHF2 PCB 8486348Z13-C Parts List 4-11 UHF2 PCB 8486348Z13-C Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Parts List Part No. Part No. Part No. Circuit Motorola Not_Placed CAP, 10pF C107 Not_Placed CAP, 27pF C204 2113743L09 CAP, 470pF Description Part No.
  • Page 44 UHF2 PCB 8486348Z13-C Parts List 4-12 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. C263 2109445U19 CAP, 4.7pF C334 2311049A57 CAPP, 10uF C456 2113743E20 CAP, 0.1uF C504 2113743L17...
  • Page 45 UHF2 PCB 8486348Z13-C Parts List 4-13 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. FL54 9180469V03 CFWC455G L264 2484562T11 IDCTR, 12.5nH 0662057N09 RES, 27K R121 0662057C55 RES, 150...
  • Page 46 SH52 2686424Z01 SHIELD Y202 Not_Placed 45J68 R421 0662057V27 RES, 100K R489 0662057A96 RES, 91K SH100 2686418Z01 SHIELD * Motorola Depot Servicing only R422 0662057N23 RES, 100K R490 Not_Placed RES, 2.2K SH200 2686424Z01 SHIELD R423 0662057N23 RES, 100K R491 0662057M01 RES, 0...

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