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Kenwood TK-285, Service Manual

The Kenwood TK-285 is a reliable two-way radio with a compact design, perfect for your communication needs. Ensure its longevity and efficient usage with the comprehensive Service Manual available for free download at manualshive.com. Access the detailed manual to maximize the potential of your Kenwood TK-285, hassle-free.

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TK-285/(N)

PARTS LIST

21

Ref. No.

Parts No.

Description

Address

New

parts

Ref. No.

Parts No.

Description

Address

New

parts

Destination

Destination

TX-RX UNIT (X57-619X-XX)

R4

RK73HB1J104J

CHIP R

100K J  1/16W

R5,6

RK73HB1J391J

CHIP R

390

J  1/16W

R7

RK73HB1J334J

CHIP R

330K J  1/16W

R8

RK73HB1J470J

CHIP R

47

J  1/16W

D1-8

HVC350B

VARIABLE CAPACITANCE DIODE

D9

HVC351

VARIABLE CAPACITANCE DIODE

Q1

2SJ243

FET

Q2,3

2SK508NV(K52)

FET

Q4

UMC4

TRANSISTOR

Q5

2SC5108(Y)

TRANSISTOR

SUB UNIT (X58-4730-XX)

Summary of Contents for TK-285

Page 1: ...ing 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 t...

Page 2: ...BOARD VIEWS DISPLAY UNIT X54 3210 13 33 TX RX UNIT X57 619X XX 39 SCHEMATIC DIAGRAM 45 BLOCK DIAGRAM 49 LEVEL DIAGRAM 51 OPTIONS 52 SPECIFICATIONS BACK COVER CONTENTS CAUTION When using an external power connector please use with maximum final module protection of 9V Photo is K type Knob ENC K29 5232 03 Knob VOL K29 5231 03 Cabinet assy A02 2055 53 16 keys Badge B43 1106 14 Packing G53 0896 02 16 ...

Page 3: ...ons equipment It contains all required service information for the equipment and is current as of the publication data Changes which may occur after publication are covered by either Service Bulletins or Manual Revisions These are issued as required ORDERING REPLACEMENT PARTS When ordering replacement parts or equipment information the full part identification number should be included This applie...

Page 4: ...he displayed call address 7 PTT Push To Talk switch Press to transmit Also press to initiate a call if PTT to Initiate Call has been programmed 8 Clear key Press to end the current call 9 Transmit indicator Lights red while transmitting 0 A key default setting Status Stack Press to activate its auxiliary function B key default setting Redial Press to activate its auxiliary function 2 C key default...

Page 5: ...irmware program Used when changing the main ming mode program of the flash memory User mode Panel test mode PC mode Firmware programming mode Panel tuning mode PC test mode Data programming mode PC tuning mode 3 Panel Test Mode Setting method refer to ADJUSTMENT 4 Panel Tuning Mode Setting method refer to ADJUSTMENT 2 How to Enter Each Mode Mode Operation User mode Power ON Panel test mode B Power...

Page 6: ...e sure that the TK 285 Is in the Program mode 6 Press write button in the window A window opens on the display to indicate progress of writing When the TK 285 starts to receive data the P icon is blinking 7 If writing ends successfully the LED on the TK 285 lights and the checksum is displayed 8 If you want to continue programming other TK 285 s repeat steps 4 to 7 Notes This mode cannot be entere...

Page 7: ... 3 Receiver System 3 1 RF unit An incoming RF signal from the antenna terminal is passed through the antenna switch D12 D14 D22 and D401 are off and then the bandpass filter L403 404 405 406 The bandpass filter is adjusted by a variable capacitor The input voltage to the variable capacitor is regulated by the voltage output from the D A converter IC8 The signal is amplified by RF amplifier Q24 and...

Page 8: ...MP IC19 CPU IF AMP 7 91 93 IC12 FM IF IC Q4 D4 SQ close SQ open Preset Value ANT input level SQ voltage ANT input level T T T T T RSSI voltage S Meter level 3 4 Squelch circuit The output from IC12 enters FM IC again then passed through a band pass filter The noise component output from IC12 is amplified by Q4 and rectified by D4 to produce a DC voltage corresponding to the noise level The DC volt...

Page 9: ...cessor IC19 The data are input to the PLL IC when the channel is changed or when transmission is changed to reception and vice versa CIRCUIT DESCRIPTION Fig 6 Microphone amplifier 12 HPF LPF HPF IDC PRE EMP ALC COMP SW LIMIT SW MIC Q300 D8 LPF IC25 1 2 MIC EXT MIC Q301 IC13 15 16 18 19 Q13 MUTE DTMF 9 8 6 D A D A IC8 IC8 IC1 I5 O5 I1 O1 D A IC8 I2 O2 LSD DI9 IC7 1 2 SUM AMP BUFF AMP VCXO VCO A1 X1...

Page 10: ...ol program for the CPU and the data for operating features This program can be easily downloaded from an external device Flash Memory Note The flash memory stores the data containing the FPU KPG 62D program Security Number MPT Serial Number and firmware program User mode Test mode Tuning mode etc This data must be reinstalled when replacing the flash memory EEPROM Note The EEPROM stores tuning dat...

Page 11: ...FSK input signal from the IF IC is amplified by IC4 1 2 and goes to pin 5 of IC13 The signal is demodulated by FFSK demodulator in IC13 The demodulated data goes to the CPU for processing 7 Signalling Circuit 7 1 Encode Low speed data QT DQT Low speed data is output from pin 1 of the CPU The signal passes through a low pass CR filter and goes to the summing amplifier IC7 1 2 The signal is mixed wi...

Page 12: ...detect input 5 SELF I Self programming mode input 6 BYTE I 5V 7 CNVSS I GND 8 SFTOE O Shift register output enable 9 LCDCS O LCD driver chip select output 10 RESET I Microcomputer reset input 11 XOUT 9 8304MHz System clock 12 VSS GND 13 XIN 9 8304MHz System clock 14 VCC 5V 15 AUX I AUX switch input 16 AFTRD I FFSK modulation data output timing pulse input 17 AFRTM I FFSK demodulation data input ti...

Page 13: ... Test pin connect to VDD 20 VDD Digital supply voltage This pin supplies power to the CMOS digital part of the device Pin No Symbol Description Pin description SEMICONDUCTOR DATA Pin Port I O Function No Name 49 A19 Not used 50 59 A9 A18 Flash memory address bus 60 VCC 5V 61 A8 Flash memory address bus 62 VSS GND 63 70 A0 A7 Flash memory address bus 71 MONI I Monitor switch input 72 EN4 I Encoder ...

Page 14: ...rse protection D2 Diode Overload protection D3 Diode Reverse current protection D4 Diode Noise detection D5 Diode RF switch 2nd IF wide narrow D6 Diode Current steering D7 Diode RF switch 2nd IF wide narrow D8 Diode Voltage clamp D9 Diode TX RX switch D10 Diode Overload protection D11 Diode Speed up D12 14 Diode ANT switch D16 17 Diode Varactor tuning D18 19 Diode Surge absorption D20 21 Diode Var...

Page 15: ... 100PF J C321 333 CC73GCH1H470J CHIP C 47PF J C335 339 CC73GCH1H470J CHIP C 47PF J C340 CK73GB1E153K CHIP C 0 015UF K C341 344 CC73GCH1H470J CHIP C 47PF J CN300 E40 5891 05 FLAT CABLE CONNECTOR 24P CN301 E40 5892 05 FLAT CABLE CONNECTOR 14P CN302 E40 5662 05 PIN ASSY SOCKET 2P SP CN303 E40 5887 05 PIN ASSY 4P PTT CN304 E40 5823 05 FLAT CABLE CONNECTOR LCD DISPLAY UNIT X54 3210 13 1 1A A02 2055 53 ...

Page 16: ...59 CK73GB1C273K CHIP C 0 027UF K C60 CK73GB1C104K CHIP C 0 10UF K C61 CK73GB1E123K CHIP C 0 012UF K C62 CK73GB1H122J CHIP C 1200PF J C63 CK73GB1H102K CHIP C 1000PF K DISPLAY UNIT X54 3210 13 TX RX UNIT X57 619X XX TX RX UNIT X57 619X XX 0 11 K E 0 21 N M L300 301 L92 0141 05 FERRITE CHIP L302 303 L92 0138 05 FERRITE CHIP L304 305 L92 0141 05 FERRITE CHIP L306 307 L92 0138 05 FERRITE CHIP L308 309 ...

Page 17: ...126 C92 0714 05 TAN C 4 7UF 6 3WV C127 CK73GB1C104K CHIP C 0 10UF K C128 CK73GB1H562J CHIP C 5600PF J C129 CK73GB1H102K CHIP C 1000PF K C130 CK73GB1H562J CHIP C 5600PF J C132 CC73GCH1H220J CHIP C 22PF J C133 CK73GB1E153K CHIP C 0 015UF K C134 CK73GB1E103K CHIP C 0 010UF K C135 CK73GB1C563K CHIP C 0 056UF K C136 CK73GB1E103K CHIP C 0 010UF K C137 CC73GCH1H100D CHIP C 10PF D C138 CK73GB1H102K CHIP C...

Page 18: ...C73GCH1H220J CHIP C 22PF J K E C249 CK73GB1H102K CHIP C 1000PF K C251 CC73GCH1H390J CHIP C 39PF J N M C251 253 CK73GB1H102K CHIP C 1000PF K K E C252 253 CK73GB1H102K CHIP C 1000PF K N M C255 CK73GB1H102K CHIP C 1000PF K C256 257 CK73HB1C103K CHIP C 0 010UF K C259 CK73GB1E103K CHIP C 0 010UF K C260 CC73GCH1H270J CHIP C 27PF J C261 CK73GB1E103K CHIP C 0 010UF K C262 CC73GCH1H010B CHIP C 1 0PF B K E ...

Page 19: ...3GB1J154J CHIP R 150K J 1 16W R19 RK73GB1J104J CHIP R 100K J 1 16W R20 RK73HB1J104J CHIP R 100K J 1 16W R21 RK73GB1J104J CHIP R 100K J 1 16W N M R21 RK73GB1J683J CHIP R 68K J 1 16W K E R22 23 RK73GB1J823J CHIP R 82K J 1 16W R24 RK73GB1J473J CHIP R 47K J 1 16W R25 RK73GB1J472J CHIP R 4 7K J 1 16W R26 RK73GB1J473J CHIP R 47K J 1 16W R27 RK73GB1J332J CHIP R 3 3K J 1 16W R28 RK73GB1J474J CHIP R 470K J...

Page 20: ... R192 RK73GB1J122J CHIP R 1 2K J 1 16W R195 RK73GB1J222J CHIP R 2 2K J 1 16W R199 RK73HB1J102J CHIP R 1 0K J 1 16W R202 RK73GB1J181J CHIP R 180 J 1 16W R217 RK73HB1J473J CHIP R 47K J 1 16W R218 RK73GB1J220J CHIP R 22 J 1 16W R219 RK73GB1J470J CHIP R 47 J 1 16W R220 RK73HB1J102J CHIP R 1 0K J 1 16W R221 RK73GB1J271J CHIP R 270 J 1 16W R239 R92 1252 05 CHIP R 0 OHM R240 RK73GB1J331J CHIP R 330 J 1 1...

Page 21: ...E COIL K E L7 L92 0138 05 FERRITE CHIP L8 L40 5675 44 SMALL FIXED INDUCTOR 56 0NH N M L8 L40 6875 44 SMALL FIXED INDUCTOR 68 0NH K E R1 RK73HB1J334J CHIP R 330K J 1 16W R2 RK73HB1J473J CHIP R 47K J 1 16W R3 RK73HB1J274J CHIP R 270K J 1 16W TX RX UNIT X57 619X XX SUB UNIT X58 4730 XX A1 SUB UNIT VCO X58 4730 XX 10 K E 21 N M The A1 is replaceable as a unit assembly so individual parts are not kept ...

Page 22: ...X RX UNIT X57 619X XX R4 RK73HB1J104J CHIP R 100K J 1 16W R5 6 RK73HB1J391J CHIP R 390 J 1 16W R7 RK73HB1J334J CHIP R 330K J 1 16W R8 RK73HB1J470J CHIP R 47 J 1 16W D1 8 HVC350B VARIABLE CAPACITANCE DIODE D9 HVC351 VARIABLE CAPACITANCE DIODE Q1 2SJ243 FET Q2 3 2SK508NV K52 FET Q4 UMC4 TRANSISTOR Q5 2SC5108 Y TRANSISTOR SUB UNIT X58 4730 XX ...

Page 23: ...0 22 Sub unit TX RX unit 59 14 27 Display unit A 2 A NUT N14 0569 04 B M2 6x4 N30 2604 46 C M2 6x10 N30 2610 46 D M2 6x6 N67 2606 46 E N79 2025 46 F M2x5 N83 2005 46 Fx2 Fx2 Fx2 Bx2 30 MIC F F F F F F 20 63 24 61 58 50 9 26 18 37 11 E 40 15 C C E 11 37 32 41 8 17 51 38 2 A A 36 S NO label S NO label ESN 701 CHASSIS Display unit B 2 34 F D D 46 IC100 49 48 ...

Page 24: ... B62 1264 00 3 Cap B09 0363 03 57 Screw set N99 2004 05 47 Hook J29 0658 05 UPC code label 44 Item carton case H52 1575 02 K N M H52 1613 02 E 42 Packing fixture H12 3014 02 43 Carton board H13 1072 04 K N M type only S NO label ESN 62 Battery assy W09 0900 35 E type only 702 Warranty card K type only ...

Page 25: ... ammeter equipped The following parts are required for adjustment 1 Antenna connector adapter The antenna connector of this radio uses an SMA terminal Use an antenna connector adapter SMA f BNC f or SMA f N f for adjustment The adapter is not provided as an option so buy a commercially available one Note When the antenna connector adapter touches the knob draw out the knob to mount the connector 2...

Page 26: ...ing PC tuning Connect the wires to the PCB in the connector case of interface cable For output the wires out of the connector case need to process the connector case 11 GREEN 5M TUBE SCREW 8 YELLOW PF SW 2 RED RX AF OUTPUT 3 BLACK RX AF OUTPUT 10 BROWN GND 6 BROWN MIC GND 5 WHITE MIC INPUT 7 BLUE PTT SW GND ON RED 2 BLK 3 100µ 10V 100µ 10V 16Ω WHT 5 BRN 6 BLU 7 BRN 10 PTT SW To Radio AF Voltmeter ...

Page 27: ...he frequencies shown in the following table When required re adjust them following the adjustment procedure to obtain the frequencies you want in actual operation Frequency MHz K E type Channel No RX frequency TX frequency 1 233 05000 234 10000 2 217 05000 218 10000 3 249 95000 249 90000 4 227 00000 227 00000 5 227 20000 227 20000 6 227 40000 227 40000 7 16 Frequency MHz M type Channel No RX frequ...

Page 28: ...ing BAL xxx MAX xxx QT xxx DQT xxx DTMF xxx SENS xxx TONE xxx FFSK xxx FREQ xxx 5 point tuning 5 point tuning 3 point tuning 3 point tuning 3 point tuning 3 point tuning 3 point tuning 3 point tuning 3 point tuning 5 point tuning ex RF Power High 3 point tuning ex Max Deviation HPOW xxx D B D B D B D B D B D B D D D D B D B D B D B D D LPOW xxx LRSI xxx SQL xxx Squelch Level RSSI Low Level 3 point...

Page 29: ...Adj item FREQ Power meter Panel ANT Panel Encoder Center frequency Adjust Adjust Am meter knob 100Hz PTT ON Note After replacing the TCXO X1 align using KPG 62D 2 Max Power 1 Adj item HPOW Check 5 2W or more Check Adjust 256 L H CH 4 9W 2 Adj item L HPOW L2 HPOW C HPOW H2 HPOW H HPOW Adjust 256 PTT ON 3 High Power 1 Adj item HPOW Encoder 5 0W 0 1W Adjust Adjust knob 2 2A or less 2 Adj item L HPOW ...

Page 30: ...5kHz 50Hz Adjust Adjust According to AG 1kHz 80mV the larger Dev meter filter LPF 15kHz HPF OFF 2 Adj item L MAX C MAX H MAX Adjust PTT ON 9 MIC Panel Test Mode Check 1 2 2 0kHz Sensitivity 1 CH Sig 1 1 Check AG 1kHz 8mV LPF 15kHz PTT ON 10 QT Deviation 1 Adj item QT Panel ANT Panel Encoder 0 35kHz 50Hz Adjust Adjust universal knob LPF 3kHz connector HPF OFF 2 Adj item L QT C QT H QT Adjust PTT ON...

Page 31: ... will be stored in memory 16 BATT Panel Test Mode Check No blinking of LED Detection 1 CH Sig 1 1 Check BATT terminal voltage 6 5V PTT ON 2 BATT terminal voltage 5 7V Blinking of LED PTT ON Receiver Section Panel Tuning Mode except when Panel TEST Mode is specified Item Condition Measurement Adjustment Specifications Test equipment Unit Terminal Unit Parts Method Remark 1 Sensitivity 1 Adj item SE...

Page 32: ...level D key 2 Adj item AF VTVM Universal That Oscilloscope Connector numeric will L LRSI C LRSI H LRSI be stored Adjust in memory 5 Squelch Panel Test Mode Check Squelch must Preset 1 CH Sig 1 1 be opened Check SSG OUT 12dB SINAD level 2 SSG OUT OFF Squelch must be closed 6 RSSI 1 Adj item HRSI After input High Adjust signal from Adjust SSG OUT SSG press 70dBm 70 7µV D key 2 Adj item That L HRSI C...

Page 33: ...ormally 0V lighting 5V 6 LR I TX LED control Normally 0V lighting 5V 7 AUX O AUX key output CN No Pin No Name I O Function DISPLAY UNIT X54 3210 13 A 2 DISPLAY section TX RX UNIT X57 619X XX TX RX section 8 PTT O PTT signal output 9 NC Not use 10 CS I LCD driver chip select input 11 AM I Audio mute signal input Mute L Unmute H 12 5M I 5V 13 GND GND 14 KI2 O KEY output 15 KI1 O KEY output 16 KRS I ...

Page 34: ...Pattern 3 Pattern 4 DISPLAY UNIT X54 3210 13 PC BOARD VIEW S301 MON S302 PTT S303 LAMP CN302 C329 C330 D305 D306 C 3 2 1 6 5 4 9 8 7 0 B A S D307 D308 D309 D310 C337 C338 MIC LCD ASSY X54 3210 13 A 2 J72 0517 22 X54 3210 13 B 2 J72 0517 22 C317 C316 SP 1 SP 2 C336 D301 o N f e R s s e r d d A 1 0 3 D C 9 5 0 3 D L 8 6 0 3 D L 6 7 0 3 D N 8 8 0 3 D N 6 9 0 3 D Q 8 0 1 3 D Q 6 ...

Page 35: ... C325 C326 C327 C328 C331 C332 NC RXD TXD 5M E NC PF PTT ME EMC NC LEDK LEDA VCI SOD SID SCLK CS VCC GND MSW SP SP SSW CP302 CP303 D300 L302 L303 R332 R326 R327 R328 R333 TH300 C321 L304 L305 C313 Q309 R301 MSW C339 Q310 R337 D315 D318 C312 S300 C304 L306 L307 C307 D303 R338 R339 C340 D320 R340 PTT R341 D319 R336 D321 C333 C344 L308 L309 C343 C342 C341 IC301 C311 C335 CN301 1 14 SB MIC ME LBL LG L...

Page 36: ...32 R326 R327 R328 R333 TH300 C321 L304 L305 C313 Q309 R301 MSW C339 Q310 R337 D315 D318 C312 S300 C304 L306 L307 C307 D303 R338 R339 C340 D320 R340 PTT R341 D319 R336 D321 C333 C344 L308 L309 C343 C342 C341 IC301 C311 C335 CN301 1 14 SB MIC ME LBL LG LR AUX PTT NC CS AM 5M GND K12 K11 KRS DT TXD RXD CK PF NC AE AF S301 MON S302 PTT S303 LAMP CN302 C329 C330 D305 D306 C 3 2 1 6 5 4 9 8 7 0 B A S D3...

Page 37: ...2 R4 R7 R6 R155 R14 R26 C49 CV C10 C11 C101 C54 C35 C414 C42 C45 C117 C123 DI9 RXAO RXAI PTTOUT RSSI TXAO PTTIN TXAI MUTE DI ANI C124 C138 C20 C38 C6 C170 C28 C23 C25 C76 R77 D11 C126 C140 C19 R248 R246 R244 IC3 1 3 5 4 IC4 IC11 IC7 1 4 8 5 IC1 IC8 L1 B L30 F1 D2 C213 D10 R221 IC5 O G I CD1 CN2 1 4 CN3 C238 C235 C241 C230 MON LAMP PTT GND R69 C229 1 AF AFE NC PF CK RXD TXD DT KRS KI1 KI2 GND 5M AM...

Page 38: ... C88 C56 C178 C167 C149 C129 C120 C226 C211 C215 C196 C410 C193 R218 C190 C194 R309 C228 C203 L29 C135 C148 C137 C32 C39 C36 L5 L20 C14 C107 R256 R255 R254 R250 R251 R252 IC16 1 7 14 8 CP2 TH1 IC13 1 11 33 23 12 22 44 34 D1 D9 IC6 O I G C31 IC23 1 4 8 5 Q20 E C B IC9 1 3 6 4 IC12 1 8 16 9 C5 R30 R282 R272 R300 R161 R303 C253 C142 R97 C90 C94 C84 C121 R93 C139 C181 C255 C183 IC14 1 10 20 11 R185 X3...

Page 39: ...R44 R61 C53 C51 IC10 1 3 5 4 R266 C239 R264 R269 C225 C219 C212 C214 C216 L35 L33 L31 C202 C210 C206 C201 C248 L27 XF1 C260 R118 C259 L407 L14 C261 L408 R122 C95 C108 D23 L26 L25 C78 L6 L11 C55 CP1 D6 C47 L10 R294 L9 C132 C80 R101 R119 R402 C402 C401 C403 C141 R403 R401 Q3 R283 R406 C112 Q1 Q2 R284 C197 C122 X2 C111 Q25 Q21 C125 Q18 C40 C22 R192 C246 C220 L34 R253 R257 C227 C242 ANT C189 C192 C407...

Page 40: ...A B C D E F G I H J K L M O N P Q S R 1 2 3 4 5 6 7 TK 285 N SCHEMATIC DIAGRAM Note Component marked with a dot are parts of pattern1 SVC MON SCN LO ...

Page 41: ...3 9dBm 129 4dBm 107 8dBm 108 8dBm 106 7dBm 113 0dBm 107 1dBm 283mVrms 269mVrms XF1 C112 Q12 C95 IC4 AF0 5 4 3 41 IC13 IC8 DAC 500mW BTL SP IC300 209mVrms 489mVrms 151mVrms 22 7mVrms IC8 DAC 12 13 ALC COMP SW IDC 6 9 8 19 18 15 16 C101 6 86mVrms 12 4mVrms 33 2mVrms 302mVrms 291mVrms 282mVrms 429mVrms 138mVrms MIC IC13 IC7 Q20 15 7dBm C192 L22 C210 RF CENTER FREQUENCY IF1 44 85MHz IF2 455kHz AF 1kHz...

Page 42: ...KMC 25 SPEAKER MICROHONE Specifications Microphone Impedance 2kΩ Sensitivity 65dB 4 0dB at 1kHz Speaker Impedance 16Ω Input 0 5W Maximum input 1 5W Dimensions 62W x 81 H x 29 D mm Weight With plug cord Approx 0 17kg External View ...

Page 43: ...0F3E 10K5F2D K FM Noise 40dB Audio Distortion Less than 3 Frequency Stability 0 00025 30 C to 60 C Channel Spread 32MHz K E 30MHz N M SPECIFICATIONS KENWOOD CORPORATION 14 6 Dogenzaka 1 chome Shibuya ku Tokyo 150 8501 Japan KENWOOD SERVICE CORPORATION P O BOX 22745 2201 East Dominguez Street Long Beach CA 90801 5745 U S A KENWOOD ELECTRONICS CANADA INC 6070 Kestrel Road Mississauga Ontario Canada ...

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