Kenwood TK-290 Service Manual
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Kenwood TK-290 Service Manual

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Document Copyrights
Copyright 2006 by Kenwood Corporation. All rights reserved.
No part of this manual may be reproduced, translated, distributed, or transmitted in any
form or by any means, electronic, mechanical, photocopying, recording, or otherwise, for
any purpose without the prior written permission of Kenwood.
Disclaimer
While every precaution has been taken in the preparation of this manual, Kenwood
assumes no responsibility for errors or omissions. Neither is any liability assumed for
damages resulting from the use of the information contained herein. Kenwood reserves
the right to make changes to any products herein at any time for improvement purposes.

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Summary of Contents for Kenwood TK-290

  • Page 1 Kenwood. Disclaimer While every precaution has been taken in the preparation of this manual, Kenwood assumes no responsibility for errors or omissions. Neither is any liability assumed for damages resulting from the use of the information contained herein. Kenwood reserves...

  • Page 2: Table Of Contents

    KRA-14 (HELICAL ANTENNA) ....... 73 SPECIFICATIONS ....... BACK COVER CAUTION When using an external power connector, Photo is TK-290 K type. please use with maximum final module protec- Does not come with antenna. tion of 10V Antenna is available as an option.

  • Page 3: General

    NOTE quired component for proper identification. WE CANNOT guarantee oscillator stability when using channel element manufactured by other than KENWOOD or its authorized agents. FCC COMPLIANCE AND TYPE NUMBERS Model...

  • Page 4: Operating Features

    TK-290 OPERATING FEATURES DTMF keypad (keypad models only) 1. Getting Acquainted Press the keys on the telephone keypad to send DTMF tones. SMA male type Battery pack antenna connector release latch Universal connector Connect the external speaker/microphone (optional) here. Otherwise, keep the supplied cover in place.
  • Page 5 TK-290 OPERATING FEATURES 2) When one priority channel is set : Either priority channel 2. Scan Operating 1 or 2 is scanned. 2-1. Scan Types If a non-priority channel stops temporarily, a priority chan- • Single Group Scan nel signal is detected at certain intervals.
  • Page 6 TK-290 OPERATING FEATURES 2-9. Temporarily Delete/Add 3-4. Squelch Threshold Level It is possible to delete or add channel temporarily during Squelch threshold level value. scan. When scan stops on unnecessary channel for ex- 0 (Most loose)~15 (Most tight) ample by interference of the other party, activate the delete/ add function (for example press the key), then that channel 3-5.
  • Page 7 TK-290 OPERATING FEATURES 3-15. Mode (Enable/Disable) • Man Down Delay Time The transceiver has many special modes mainly for main- Delay time of entering the emergency mode when the tenance. internal Man Down port becomes active. · Self Programming mode ·...
  • Page 8 TK-290 OPERATING FEATURES 4. Group Features 5. Channel Features You can use these features using the programming soft- You can use these features using the programming soft- ware (KPG-38D). ware (KPG-38D). 4-1. “TOT” (Time-Out Timer) 5-1. Option Signalling The transceiver has the “TOT”. This parameter selects The transceiver is programmable to the option signalling the period of time users can continuously transmit.
  • Page 9 TK-290 OPERATING FEATURES 6. Key Functions Toggle PF Keys Speaker/ Function Name Selector Switch Microphone You can use these features, using the programming soft- ware (KPG-38D). Selector function is selectable channel se- PF Keys lect or group select. The functions for Toggle switch are listed page 8 (Fig. 2).
  • Page 10 TK-290 OPERATING FEATURES 6-7. Group Down 6-14. Monitor If this key is pressed once, the group number decreases Monitor the channel before a transmission. by one step. If this key holds down for 500ms (approxi- Press this key once, “MON” appears and unmutes mate), the group number decreases continuously.
  • Page 11 Press this key again, the transceiver mutes the speaker compatible machine. and “MON” disappears and busy “LED” lights off. The data can be input to or read from TK-290 and edited on the screen. The programmed or edited data can be 6-24. Talk Around printed out.

  • Page 12: Realignment

    TK-290 REALIGNMENT 1. Mode 3. Self Programming Write mode for frequency data and signalling etc. Mainly User mode used by the person maintaining the user equipment. PC mode PC programming mode 3-1. Enter to the self programming mode PC test mode...
  • Page 13 TK-290 REALIGNMENT 3-2. Channel Setting Mode Set data for each channel while in this mode. After first entering Self programming mode, select the “CHAN” dis- play with [Top 1] [Top 2] and press [PTT] to set Channel Set- X57-5390-10 Component side ting mode.
  • Page 14 TK-290 REALIGNMENT • Operation 3-3. Group Setting Mode Set data for each Group while in this mode. After first 1. Select the setting value with the [Top 1] [Top 2] keys. entering Self programming mode, select the “GROUP” dis- 2. Press the [PTT] and the selected value is backed up and play with [Top 1] [Top 2] and press [PTT] to set Group Set- operation shifts to the next item for setting.
  • Page 15 TK-290 REALIGNMENT 3-4. Function Setting Mode • Flow Chart This mode allows making function settings for the trans- ceiver. After first entering Self programming mode, select Self programming mode “FUNC” display with [Top 1] [Top 2] and then press [PTT] to [Top 1] [Top 2] set this mode.
  • Page 16 TK-290 REALIGNMENT 3-5. Clone Mode • Group Clone 1. Connect the cloning interface cable between the master 1. To clone the transceiver group data and channel data side transceiver (source) and slave side transceiver within the group, as well as group alphanumeric data, use (clone) as shown in the figure.
  • Page 17 Setup item. Setting method refer to ADJUSTMENT. 4. Set the firmware to be updated by File select. 5. Held down the [Side 2] and [PTT]. Turn the TK-290 power on, and release [Side 2] first. Until the display change to “PROGRAM”.

  • Page 18: Circuit Description

    TK-290 CIRCUIT DESCRIPTION 1. Overview 3. Receiver System The KENWOOD model TK-290 is a VHF/FM hand-held 3-1. Front-end RF amplifier transceiver designed to operate in the frequency range of The signal are then passed through an antenna matching 136 to 174MHz, the unit consists of a receiver, a transmit-...
  • Page 19 TK-290 CIRCUIT DESCRIPTION 3-4. Wide/Narrow changeover circuit • Control unit Narrow and Wide settings can be made for each channel The audio mute signal (AMP SW) from the microproces- sor becomes Low in the standby and Q5, Q6 which are by switching the ceramic filters CF300, CF301 (Wide), power supply circuit for IC1 turn off.
  • Page 20 TK-290 CIRCUIT DESCRIPTION 4-3. Drive and Final amplifier 4. Transmitter System The signal from the T/R switch (D602 is on) is amplified 4-1. Microphone amplifier by the pre-drive (Q6) and drive amplifier (Q8) to 20mW. The The signal from IC3 (control unit) goes through the mute output of the drive amplifier is amplified by the RF power switch (Q403).
  • Page 21 1 of the VCXO. The output of the VCXO is applied to pin 8 of the PLL IC. The VCO of TK-290 covers the 38MHz spread, setting 6. Power Supply Circuit frequencies in r1, r2 (receive) and t1, t2 (transmit) with a bias Battery +B is supplied via a 3A fuse from the battery ter- voltage applied to the –V terminal of the VCO.
  • Page 22 TK-290 CIRCUIT DESCRIPTION 7-3. Shift register 7. Control Circuit IC400, 403, 404 and 405 is an interface IC for output port The control unit consists of microprocessor IC406, flash expansion. It is used to expand the CPU (IC406) output memory IC414, and its peripheral circuits. It controls the TX- ports.
  • Page 23 TK-290 CIRCUIT DESCRIPTION 7-6. Low battery warning RX AUDIO DIN, DCK, The battery voltage is monitored by the microprocessor IC607 IC406 MSKE (IC406). When the battery voltage falls below the voltage IC604 (2/2) IC603 set by the Low Battery Warning adjustment, the red LED...
  • Page 24 Pin 41 : Expander output pin compressed so that the logarithmic ratio is 1/2 with refer- The TK-290 compander can be turned on or off only when ence to –10dBV, and then output onto the transmission modulation is set to Narrow by FPU setting. The compander path.
  • Page 25 TK-290 CIRCUIT DESCRIPTION 10-1. Option port 1 (For ANI board etc.) Port name Description Connection Note Abbreviation (PCB) Name DATI Data In Board data input Connected to the circuit Reference 1kHz STD Dev → Transceiver (Receiver demodulation circuit) → ANI board...

  • Page 26: Semiconductor Data

    TK-290 SEMICONDUCTOR DATA 1. Microprocessor : 784214GC0648EU (TX-RX Unit IC406) 1-1. Terminal function Pin No. Port name Function Pin No. Port name Function P120/RTP0 Modem FCLR P82/A2 – Flash ROM access port. P121/RTP1 SB control P83/A3 – P122/RTP2 D/A converter CS P84/A4 –...
  • Page 27 TK-290 SEMICONDUCTOR DATA / DESCRIPTION OF COMPONENTS 2. RF Power Amplifier (Final Unit IC801) Final Unit (X45-3592-71) Ref. No. Use / Function Operation / Condition M68776 IC801 RF power amplifier 2-1. Block diagram Control Unit (X53-3930-XX) -11 : K -12 : K2 Ref.

  • Page 28: Description Of Components

    TK-290 DESCRIPTION OF COMPONENTS TX-RX UNIT (X57-5390-10) Ref. No. Use / Function Operation / Condition Ref. No. Use / Function Operation / Condition Level shift Q302 IF amplifier Post amplifier D/A converter (adjustment) Q303 DC switch 2nd IF W/N switch sets Outputs ±...

  • Page 29: Parts List

    TK-290 PARTS LIST CAPACITORS CC 45 TH 1H 220 J • Capacitor value Color* CC45 010 = 1pF 0 = 22pF 100 = 10pF 1 = Type … ceramic, electrolytic, etc. 4 = Voltage rating Multiplier 101 = 100pF 2 = Shape … round, square, ect.
  • Page 30 TK-290 PARTS LIST New Parts. indicates safety critical components. L : Scandinavia K : USA P : Canada Parts without Parts No. are not supplied. Y : PX (Far East, Hawaii) T : England E : Europe Les articles non mentionnes dans le Parts No. ne sont pas fournis.
  • Page 31 TK-290 PARTS LIST CONTROL UNIT (X53-3930-XX) TX-RX UNIT (X57-5390-10) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation CK73GB1H102K CHIP C 1000PF DTZ3.9(B) ZENER DIODE CC73GCH1H101J CHIP C 100PF UDZ3.9(B) ZENER DIODE...
  • Page 32 TK-290 PARTS LIST TX-RX UNIT (X57-5390-10) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation CK73GB1H471K CHIP C 470PF C303 CK73GB1C104K CHIP C 0.10UF CK73GB1H102K CHIP C 1000PF C304 CK73GB1H102K CHIP C...
  • Page 33 TK-290 PARTS LIST TX-RX UNIT (X57-5390-10) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation C480 CC73GCH1H221J CHIP C 220PF CN401 E40-5947-05 FLAT CABLE CONNECTOR C481 CK73FB1C105K CHIP C 1.0UF CN403...
  • Page 34 TK-290 PARTS LIST TX-RX UNIT (X57-5390-10) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation RK73GB1J103J CHIP R 1/16W R208 RK73GB1J122J CHIP R 1.2K 1/16W RK73GB1J682J CHIP R 6.8K 1/16W R209...
  • Page 35 TK-290 PARTS LIST TX-RX UNIT (X57-5390-10) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation R424 RK73GB1J103J CHIP R 1/16W R618 RK73GB1J683J CHIP R 1/16W R425 RK73GB1J102J CHIP R 1.0K 1/16W...
  • Page 36 TK-290 PARTS LIST TX-RX UNIT (X57-5390-10) Desti- Desti- Ref. No. Address Parts No. Description Ref. No. Address Parts No. Description parts nation parts nation D200 HSM88AS DIODE Q407 2SC4215(Y) TRANSISTOR D201-208 1SV273 VARIABLE CAPACITANCE DIODE Q408-410 2SC4617(S) TRANSISTOR D300 MA742...

  • Page 37: Exploded View

    TK-290 EXPLODED VIEW : N14-0578-04 : N14-0594-04 M2.6 x 8 BLK : N30-2608-45 D M2.6 x 6 : N67-2606-46 M2 x 3 : N78-2030-46 M2 x 3.5 : N79-2035-46 G M2 x 4 : N83-2004-46 X53 A/6 IC801 Parts with the exploded numbers larger than 700 are not supplied.

  • Page 38: Packing

    TK-290 PACKING 7 Dressing plate Cap (SP/MIC) (B03-0594-04) (B09-0363-03) 38 Cushion (Cap) 13 Instruction manual (G13-1688-04) 16 Stopper (B62-0816-30) (D32-0421-24) 48 Protection bag (H25-0029-04) 71 Screw set (N99-2004-05) 57 Belt hook (J29-0652-35) 702 Warranty card 47 Packing fixture (H12-3018-02) 49 Item carton case...

  • Page 39: Disassembly For Repair

    TK-290 DISASSEMBLY FOR REPAIR Disassembly of Front Case and Chassis Remove the Side Key Assy 1. Remove the 2 screws ( ) and a cap fixed screw ( 1. The side key assy is clips form a slide-hook structure. Lift 2.

  • Page 40: Adjustment

    TK-290 ADJUSTMENT Test Equipment Required for Alignment Test Equipment Major Specifications Standard Signal Generator Frequency Range Maximum 600MHz or more. (SSG) Modulation Frequency modulation and external modulation. Output –133dBm/0.05µV to 7dBm/501mV Power Meter Input Impedance 50Ω. Operation Frequency Up to 600MHz.
  • Page 41 TK-290 ADJUSTMENT • Panel tuning Repair Jig (Chassis) Use jig (part No.: A10-1399-03) for repairing the TK-390 Place the TX-RX unit on the jig and fit it with 7 screws. Note : Supply power from an external power supply (Battery terminal : +, jig (chassis) : –)
  • Page 42 TK-290 ADJUSTMENT • Clear function Panel Test Mode Pressing [PTT] while holding down [Orange] in Panel test This mode is used for making transceiver connection mode, triggers the clear function which clears all transceiver tests and clearing the memory. data settings.
  • Page 43 TK-290 ADJUSTMENT Common Section Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment ± 0.1V 1. Varicap shift 1) Set panel tuning mode DC VTVM TX-RX TP2 Panel Top1/ –3V voltage Push Side2 to select Top2 VSWM ±...
  • Page 44 TK-290 ADJUSTMENT Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment 4. TX high 1) Set panel test mode Power meter Panel Check 3.7W~5.2W power CH No. : 1 2.3A or less check Signalling No. : 1...
  • Page 45 TK-290 ADJUSTMENT Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment ± 50Hz 8. Maximum 1) Set panel test mode Power meter Panel Panel Top1/ 3.95kHz deviation CH No. : 3 Deviation Top2 (According to the adjustment Signalling No.
  • Page 46 TK-290 ADJUSTMENT Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment ± 0.05kHz 11. QT 1) Set panel tuning mode Power meter Panel Panel Top1/ 0.75kHz deviation CH No. : 3 Deviation Top2 adjustment Signalling No. : 1...
  • Page 47 TK-290 ADJUSTMENT Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment ± 50Hz 16. DTMF 1) Set panel tuning mode Power meter Panel Panel Top1/ 1.5kHz deviation CH No. : 3 Deviation Top2 adjustment Signalling No. : 1...
  • Page 48 TK-290 ADJUSTMENT Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment 22. BATT 1) Set panel test mode Power meter Panel Check Cannot transmit detection CH No. : 3 LED (TX) blinks check Signalling No. : 1 DC VTVM Bottom BATT BATT terminal voltage : 5.3V...
  • Page 49 TK-290 ADJUSTMENT Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment 4. Sensitivity 1) Set panel test mode Panel Panel Top1/ Adjust for maximum 12dB SINAD or more adjustment CH No. : 3 Top2 SINAD and check Signalling No.
  • Page 50 TK-290 ADJUSTMENT Measurement Adjustment Item Condition Specifications/Remarks Test- Unit Terminal Unit Parts Method equipment 9. Squelch 1) Set panel test mode Panel Panel Top1/ Adjust to point of adjustment CH No. : 3 Top2 opening squelch (narrow) Signalling No. : 1...
  • Page 51 TK-290 PC BOARD VIEW FINAL UNIT (X45-3592-71) Component side view IC801 J72-0654-12 C802 Vcont...

  • Page 52: Pc Board Views

    TK-290 PC BOARD VIEWS CONTROL UNIT (X53-3930-XX) -11 : K -12 : K2 Component side view TOP2 TOP1 TOGGLE SW Ref No. Address D102 D103 D104 INT MIC (N/C) – J72-0705-22 A/6 Component side Ref No. Address Pattern 1 Pattern 2...
  • Page 53 TK-290 PC BOARD VIEWS CONTROL UNIT (X53-3930-XX) -11 : K -12 : K2 Foil side view R106 R108 BLED R103 TXLED LAMP R104 IC101 TOGGLE TOGGLE DGND DGND Ref No. Address IC101 D101 PTTE J72-0705-22 A/6 Component side Ref No. Address Ref No.
  • Page 54 TK-290 PC BOARD VIEW TX-RX UNIT (X57-5390-10) Component side view C471 C467 DATI CODE4 C466 C469 CODE3 DATO C465 C470 C234 R215 TCNT CODE2 IC404 CN401 C464 CODE1 STONE R404 C462 AUDIH TXOUT R408 C461 R478 RXOUT C468 R495 MUTE...

  • Page 55: Tx-Rx Unit (X57-5390-10)

    TK-290 PC BOARD VIEW TX-RX UNIT (X57-5390-10) Foil side view D603 C227 D602 R219 C237 R216 L212 R213 IC414 C214 C224 R403 R430 L800 L210 C216 C229 C228 D205 IC415 D207 L213 C484 C215 R214 R466 D208 C230 C206 L214...
  • Page 56 TK-290 PC BOARD VIEW TX-RX UNIT (X57-5390-10) Component side view + Foil side C471 C467 DATI CODE4 D603 C227 C466 C469 CODE3 DATO D602 C465 C470 C234 R215 TCNT CODE2 IC404 CN401 L212 R216 C237 R219 C464 CODE1 R213 STONE...
  • Page 57 TK-290 Note : Components marked with a dot (·) are parts of pattern 1. SCHEMATIC DIAGRAM...

  • Page 58: Schematic Diagram

    TK-290 SCHEMATIC DIAGRAM Note : Components marked with a dot (·) are parts of pattern 1.

  • Page 59: Block Diagram

    TK-290 TK-290 BLOCK DIAGRAM RF X57-539 Fuse 136~174MHz X45-539 INT.ANT +BATT Protect Power Amp Drive Amp Drive Amp (IC801) TX/RX 2SJ144 Buff Amp Buff Amp M68776 MA2S D400 1SR154-400 SB SW 2SC5110 2SC4988 DISPLAY X53-393 B/6 IC10 Power SW KCH40...

  • Page 60: Level Diagram

    TK-290 LEVEL DIAGRAM...

  • Page 61: Terminal Function

    TK-290 TERMINAL FUNCTION CN No. Pin No. Name I/O Function CN No. Pin No. Name I/O Function BTL input + for external speaker. TX-RX UNIT (X57-5390-10) SP– BTL input – for external speaker. CN400 CH D CH switch data. MUTE O Audio mute signal output.

  • Page 62: Knb-17A (Ni-Cd Battery)

    TK-290 TERMINAL FUNCTION / KNB-17A (Ni-Cd BATTERY) KNB-17A External View CN No. Pin No. Name I/O Function – Not use. Key scan IC clock data input. Key scan IC reset input. INAFC Internal speaker switch input. EXAFC External speaker switch input.
  • Page 63 TK-290 KMC-25/26 (SPEAKER MICROPHONE) KMC-25 External View KMC-25/26 Circuit Diagram Universal SP/MIC connector EXT. ANT (KMC-26) SP– If the earphone jack output is too high, adjust the value of resistor R12. Earphone R12 0 jack ø3.5 2.2K 10µ Shield –...

  • Page 64: Helical Antenna)

    TK-290 KSC-19 (CHARGER) / KSC-20 (RAPID CHARGER) / KPG-36 (PRO- GRAMMING INTERFACE CABLE) / KRA-14 (HELICAL ANTENNA) KSC-19 External View KPG-36 External View KSC-19 Charging KNB-17A Voltage ..........7.2V Battery capacity ........1500mAh Charging time ........Approx. 8 hours KSC-20 External View...

  • Page 65: Specifications

    Mechelsesteenweg 418 B-1930 Zaventem, Belgium KENWOOD ELECTRONICS FRANCE S.A. 13, Boulevard Ney, 75018 Paris, France KENWOOD ELECTRONICS U.K. LIMITED KENWOOD House, Dwight Road, Watford, Herts., WD1 8EB United Kingdom KENWOOD ELECTRONICS EUROPE B.V. Amsterdamseweg 37, 1422 AC Uithoorn, The Netherlands KENWOOD ELECTRONICS ITALIA S.p.A.

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