Kenwood TM-471A Service Manual Download

Page: 1 / 46

UHF FM TRANSCEIVER

TM-471A

SERVICE MANUAL

CIRCUIT DESCRIPTION ............................ 2

SEMICONDUCTOR DATA ........................ 8

COMPONENTS DESCRIPTION ................ 9

PARTS LIST ............................................. 10

EXPLODED VIEW .................................... 17

PACKING ................................................. 18

RESETTING THE TRANSCEIVER ........... 19

ADJUSTMENT ........................................ 20

TERMINAL FUNCTION ........................... 27

PC BOARD

DISPLAY UNIT (X54-3450-10) ............ 28

TX-RX UNIT (X57-686X-XX) ............... 30

SCHEMATIC DIAGRAM .......................... 34

BLOCK DIAGRAM ................................... 38

LEVEL DIAGRAM .................................... 40

SPECIFICATION ................... BACK COVER

CONTENTS

Microphone
(T91-0641-05)

Cabinet
(A01-2193-01)

Panel assy
(A62-1102-03)

Knob (Encoder)
(K29-9293-03)

Key top
(K29-9291-01)

Knob (Volume)
(K29-9292-03)

Summary of Contents for TM-471A

Page 1: ...ODED VIEW 17 PACKING 18 RESETTING THE TRANSCEIVER 19 ADJUSTMENT 20 TERMINAL FUNCTION 27 PC BOARD DISPLAY UNIT X54 3450 10 28 TX RX UNIT X57 686X XX 30 SCHEMATIC DIAGRAM 34 BLOCK DIAGRAM 38 LEVEL DIAGRAM 40 SPECIFICATION BACK COVER CONTENTS Microphone T91 0641 05 Cabinet A01 2193 01 Panel assy A62 1102 03 Knob Encoder K29 9293 03 Key top K29 9291 01 Knob Volume K29 9292 03 ...

Page 2: ...5MHz IF SYSTEM PLL VCO 16 8MHz 50 4MHz ANT RX TX SP MIC Fig 1 Frequency configuration IF Amplifier The first IF signal is amplified by Q351 and then goes to IC301 FM processing IC The signal is heterodyned again with a second local oscillator signal within IC301 to create a 450kHz second IF signal The second IF signal is then fed through a 450kHz ceramic filter Wide CF301 Narrow CF302 to further e...

Page 3: ...161 W NO EVOL2 AF PA IC252 SP IF IC IC301 Q301 NOISE AMP D301 IC301 IC101 AFO RSSI DET CPU IF SYSTEM SQIN RSSI Fig 3 Wide Narrow switching circuit Fig 4 AF signal system Fig 5 Squelch circuit PLL Frequency Synthesizer The PLL circuit generates the first local oscillator signal for reception and the RF signal for transmission PLL The frequency step of the PLL circuit is 5 or 6 25kHz A 16 8MHz refer...

Page 4: ...ter removes unwanted high frequency har monic components and the resulting signal is transmitted through the antenna terminal See Fig 8 APC Circuit The automatic transmission power control APC circuit detects part of a final amplifier Q504 output with a diode D606 D607 and applies a voltage to IC501 IC501 com pares the APC control voltage PC generated by the D A con verter IC161 and DC amplifier I...

Page 5: ...D driver The LCD driver monitors the status of the KI1 to KI3 and KS1 to KS2 ports If the state of one of the ports changes the LCD driver assumes that the key at the matrix point corre sponding to that port has been pressed Encode The DCS and CTCSS signals are output from QT DQT of the CPU IC101 and summed with the external pin DI line by the summing amplifier IC203 and the resulting signal goes ...

Page 6: ... CPU send to EEPROM IC66 the backup data and go into STOP mode This circuit has an overvoltage protection circuit If a DC voltage of 18V or higher is applied to the base of Q61 this voltage turns Q61 on and will set to high on CPU port 18 INT Then CPU send to EEPROM IC66 the backup data and go into stop mode See Fig 16 IC101 CPU DTMF IN W NO EVOL2 95 Q71 SW Q31 SW Q32 SW Q61 SW IC33 AVR D61 D62 B ...

Page 7: ...ays output whether the squelch is open or closed PR1 is the 1200bps data communications reception out put It outputs the FM detection circuit output through an AF filter IC251 Output is controlled with the mute switch Q252 according to whether squelch is open or closed See Fig 17 Squelch Signal Output Circuit The squelch circuits is input to the TNC to prevents con flicts from occurring between si...

Page 8: ...ute 51 SPM O Speaker mute 52 AMPSW O AF AMP switch Pin No Name I O Function 53 DT O Common data 54 CK O Common clock 55 NC I 56 DST1 I Destination 1 57 59 DST2 DST4 I Destination 2 4 60 VCC 5V 61 NC I 62 VSS GND 63 ADJ I For adjustment mode 64 NARROW O Wide Narrow 2 65 WIDE O Wide Narow 66 67 NC I 68 LCDCL O Clock for LCD 69 LCDCE O Chip enable for LCD 70 LCDDO O Output data to LCD 71 LCDDI I Inpu...

Page 9: ...Active while AMPSW is H Q301 Transistor SQL amplifier Noise amplifier Q302 Transistor Buffer amplifier 16 8MHz 3rd over tone Ref No Parts name Description Q351 Transistor IF amplifier Q352 FET Mixer Q353 FET RF amplifier LNA Q354 FET PC TV switch Q402 403 Transistor Charge pump Q404 Transistor RF amplifier PLL F in Q405 FET RX VCO Q406 FET TX VCO Q407 FET T R SW Q408 Transistor T R SW Q410 Transis...

Page 10: ...1 0641 05 MICROPHONE ACCESSORY 101 2A B11 1809 03 ILLUMINATION GUIDE LCD 102 2A B38 0885 05 LCD D2 4 B30 2205 05 LED YG D19 30 B30 2205 05 LED YG C4 CC73GCH1H101J CHIP C 100PF J C15 16 CC73GCH1H101J CHIP C 100PF J C19 CK73GB1H681K CHIP C 680PF K C22 CK73GB1H102K CHIP C 1000PF K C24 CK73GB1C104K CHIP C 0 10UF K C25 CK73GB1H102K CHIP C 1000PF K C27 CK73GB1H102K CHIP C 1000PF K C30 CK73GB1C104K CHIP ...

Page 11: ...WV C250 CK73GB1C104K CHIP C 0 10UF K C251 C92 0714 05 CHIP TAN 4 7UF 6 3WV C252 CC73GCH1H390J CHIP C 39PF J C253 254 CK73GB1A224K CHIP C 0 22UF K C255 CK73GB1H822K CHIP C 8200PF K C256 CK73GB1E183K CHIP C 0 018UF K C257 CK73GB1C393K CHIP C 0 039UF K C258 261 CK73GB1H103J CHIP C 0 010UF J C262 CK73GB1H471K CHIP C 470PF K C263 264 CK73GB1C333K CHIP C 0 033UF K C265 CK73GB1C104K CHIP C 0 10UF K C266 ...

Page 12: ...1H471K CHIP C 470PF K C434 CC73GCH1H050B CHIP C 5 0PF B C C434 CC73GCH1H090B CHIP C 9 0PF B C2 C435 CC73GCH1H060B CHIP C 6 0PF B C436 CC73GCH1H0R5B CHIP C 0 5PF B C437 CK73GB1H471K CHIP C 470PF K C438 CC73GCH1H010B CHIP C 1 0PF B C2 C438 439 CC73GCH1H020B CHIP C 2 0PF B C C439 CC73GCH1H030B CHIP C 3 0PF B C2 C440 CC73GCH1H030B CHIP C 3 0PF B C C440 CC73GCH1H040B CHIP C 4 0PF B C2 C441 CC73GCH1H0R3...

Page 13: ... 05 AIR CORE COIL C2 L358 359 L34 4605 05 AIR CORE COIL C L359 L34 4604 05 AIR CORE COIL C2 L360 L34 4603 05 AIR CORE COIL C2 L360 361 L34 4604 05 AIR CORE COIL C L361 L34 4604 05 AIR CORE COIL C2 L401 L92 0443 05 FERRITE CHIP L403 L41 1005 08 SMALL FIXED INDUCTOR L404 L92 0442 05 FERRITE CHIP L405 L92 0443 05 FERRITE CHIP L406 407 L40 2785 92 SMALL FIXED INDUCTOR 270NH C L406 407 L40 4791 86 SMAL...

Page 14: ...6W R250 RK73GB1J123J CHIP R 12K J 1 16W R251 RK73GB1J473J CHIP R 47K J 1 16W R252 RK73GB1J474J CHIP R 470K J 1 16W R253 R92 1252 05 CHIP R 0 OHM J 1 16W R254 RK73GB1J272J CHIP R 2 7K J 1 16W R255 256 RK73GB1J562J CHIP R 5 6K J 1 16W R257 RK73GB1J105J CHIP R 1 0M J 1 16W R258 RK73GB1J272J CHIP R 2 7K J 1 16W R259 RK73GB1J123J CHIP R 12K J 1 16W R260 RK73GB1J224J CHIP R 220K J 1 16W R261 RK73GB1J124...

Page 15: ...73GB1J102J CHIP R 1 0K J 1 16W R445 R92 1252 05 CHIP R 0 OHM J 1 16W R501 RK73GB1J102J CHIP R 1 0K J 1 16W R502 RK73GB1J472J CHIP R 4 7K J 1 16W R506 RK73GB1J103J CHIP R 10K J 1 16W R507 RK73GB1J470J CHIP R 47 J 1 16W R509 RK73GB1J100J CHIP R 10 J 1 16W R511 RK73GB1J471J CHIP R 470 J 1 16W R512 RK73GB1J332J CHIP R 3 3K J 1 16W R513 RK73GB1J682J CHIP R 6 8K J 1 16W R514 RK73FB2A470J CHIP R 47 J 1 1...

Page 16: ...Q86 87 2SK1830 FET Q201 2SC4919 TRANSISTOR Q251 2SC2412K TRANSISTOR Q252 253 2SK3019 FET Q254 DTC363EU DIGITAL TRANSISTOR Q255 KRC102S DIGITAL TRANSISTOR Q301 302 2SC2412K TRANSISTOR Q351 2SC5108 Y TRANSISTOR Q352 353 3SK255 FET Q354 2SK1830 FET C2 Q402 2SA1832 GR TRANSISTOR Q403 2SC4738 GR TRANSISTOR Q404 2SC4649 N P TRANSISTOR Q405 406 2SK508NV K52 FET Q407 2SJ347 FET Q408 KRX102U TRANSISTOR Q41...

Page 17: ... A 1 30 31 18 2 3 Dx8 13 19 29 Ax2 A Cx12 26 23 IC252 Q504 25 27 8 Cx2 6 701 S No label 700 Caution label 28 44 43 48 14 42 24 24 Bx2 15 103 101 104 102 TX RX unit Display unit A M2 6 x 8 N67 2608 46 B M2 x 10 BLK N80 2010 45 C M2 6 x 6 Br Tap N87 2606 46 D M2 6 x 14 Br Tap N87 2614 46 702 Sticker ...

Page 18: ...d E30 2111 15 46 Screw set N99 0395 05 703 Pamphlet 36 Protection bag H25 2341 04 36 Protection bag H25 2341 04 33 Packing fixture H12 3112 05 33 Packing fixture H12 3112 05 34 Carton board H13 1190 02 40 Bracket J29 0662 03 39 MIC holder J19 1584 05 37 Item carton case H52 2030 02 50 Microphone T91 0641 05 19 Fuse 6x30 15A F51 0017 05 ...

Page 19: ...sceiver parameters excluding the DTMF Memory the Memory channel contents and the Call channel contents There are two methods available for reset ting the transceiver Note Menu No 7 P VFO and Menu No 10 OFFSET re turn to the factory default values VFO Reset Method 1 1 With the transceiver power OFF press VFO Power The VFO reset confirmation message appears 2 Press F SURE appears Press any key other...

Page 20: ...m dis play returns t Moves the adjustment item forward If it is operated when a frequency is displayed the adjustment item dis play returns y If it is pressed before determining the adjustment value the adjustment value of the Adjustment item returns to its original value u Not used in Adjustment Mode Note If Max Power for transmission is low check the DC cable If the DC cable connector has poor c...

Page 21: ... 460 05 CTCSS Fine Deviation Low CT icon appear 400 10 400 05 440 10 440 05 CTCSS 88 5Hz Center 415 10 415 05 460 10 460 05 High 429 90 429 95 479 90 479 95 CTCSS Fine Deviation Narrow Center CT and N icon appear 415 10 415 05 460 10 460 05 DCS Fine Deviation Low DCS icon appear 400 10 400 05 440 10 440 05 DCS 023N Center 415 10 415 05 460 10 460 05 High 429 90 429 95 479 90 479 95 DCS Fine Deviat...

Page 22: ...or less 7 Ammeter 20A 8 AF Volt Meter Frequency Range 50Hz to 10kHz AF VTVM Voltage Range 1mV to 3V 9 Audio Generator AG Frequency Range 20Hz to 20kHz or more Output 0 to 1V 10 Distortion Meter Capability 3 or less at 1kHz Input Level 50mV to 10Vrms 11 8Ω Dummy Load Approx 8Ω 10W or more 12 Regulated Power Supply 13 8V approx 20A adjustable from 9 to 17V Useful if ammeter requipped 13 Spectrum Ana...

Page 23: ...rmed before mounting the shield cover as below Fuse To mount the fuse the cable terminal direction must be as follow Locator Speaker cable This side up This side up Cable terminal Cable terminal Fuse Pin 1 marker Part name label face down IC252 TX RX UNIT Component side R822 F501 VR601 Q504 R525 R536 5M GND PR9 PR1 PKS SQC PKD IC252 RXD TXD CNVSS RESET POWER B E RF CV Q503 DC PC 8T BPF TEMP1 AFV 8...

Page 24: ...ing TC402 Item Condition Test equipment Terminal Parts Method Specifications Remarks Measurement Adjustment Transmitter Section 1 Frequency 1 CH TX center Frequency counter ANT Encoder Adjust to center frequency Within 20Hz 2 Transmit knob 2 Maximum 1 CH TX high Power meter VR601 43W 1W power 2 Adjustment HEX value FF alignment 3 Transmit 3 High 1 CH TX low Encoder 40W 1 0W power CH TX low knob CH...

Page 25: ...fore the Drive FET Item Condition Test equipment Terminal Parts Method Specifications Remarks Measurement Adjustment ADJUSTMENT 6 MAX 1 CH TX low Wide Modulation analyzer ANT Encoder 4 0kHz Wide 100Hz Wide deviation CH TX center Wide Narrow or Linear detector MIC knob 2 0kHz Narrow 50Hz Narrow CH TX high Wide LPF 15kHz According to the large 2 AG 1kHz 50mV Oscilloscope 3 Transmit AG AF V M 7 MIC 1...

Page 26: ...ide open CH RX center Wide Narrow CH RX high Wide 2 SSG output 124dBm 0 14µV Wide Narrow Mod 1kHz Dev 3 0kHz Wide Dev 1 5kHz Narrow 4 RSSI 1 CH RX center Wide Push RSSI value writing is per writing 2 SSG output 53dBm 501µV encoder formed by the Squelch Mod 1kHz knob open item center wide Dev 3 0kHz SSG output level is changed and adjusted after SQ adjustment This adjustment should not turn the enc...

Page 27: ... 2 SQC Squelch Signal 3 PKS Transmission Control 4 PR1 1200bps Receive Data 5 PR9 9600bps Receive Data 6 GND Ground 7 PKD Transmission Modulation CN No Pin No Name Function CN5 1 INT SP Internal speaker 2 GND Ground DISLAY UNIT X54 3450 10 CN No Pin No Name Function CN1 1 ENC A Encoder A 2 CM Microphone Key Check 3 ENC B Encoder B 4 MIC KEY Microphone Key 5 DI Data Out from LCD 6 CE Chip Enable fo...

Page 28: ...EG8 SEG7 S G D3 J1 MIC JACK D19 D20 D21 CALL VFO MR D22 D23 D25 D26 D27 D28 D29 VR1 POWER VOL C24 C27 C30 C31 C32 C33 C36 C38 C39 8C 8C PTT PTT MIC MIC CM CM MBL MBL GND GND ME ME HOOK HOOK C40 R55 C4 L1 D31 IC3 1 16 17 32 33 48 49 64 R21 R22 R23 R25 R46 R51 R52 R53 CP1 C15 C16 C19 LCD 28 TM 471A PC BOARD DISPLAY UNIT X54 3450 10 Component side view J72 0905 09 DISPLAY UNIT X54 3450 10 Foil side v...

Page 29: ...0 R54 CN1 1 18 ENCA CM ENCB MIC KEY DI CE CL DO 5C 8C VOL POWER RXD BRI PTT GND ME MIC 29 Component side Foil side Layer 1 Layer 2 Component side Foil side Layer 1 Layer 2 DISPLAY UNIT X54 3450 10 Foil side view J72 0905 09 DISPLAY UNIT X54 3450 10 Component side view J72 0905 09 PC BOARD TM 471A Ref No Address D2 6F D3 6J D4 5O D19 4G D20 4P D21 4E D22 4I D23 4J D24 4K D25 3G D26 3F D27 3E D28 3I...

Page 30: ...OK C40 R55 Q10 Q12 1 2 3 5 C4 L1 D31 IC3 1 16 17 32 33 48 49 64 R10 R21 R22 R23 R25 R26 Q6 Q9 B C E R8 R41 R42 R43 R44 R45 R46 R49 R50 R51 R52 R53 R54 CN1 CP1 C15 C16 C19 LCD 1 18 ENCA CM ENCB MIC KEY DI CE CL DO 5C 8C VOL POWER RXD BRI PTT GND ME MIC 28 29 TM 471A PC BOARD Component side Foil side Layer 1 Layer 2 Component side Foil side Layer 1 Layer 2 DISPLAY UNIT X54 3450 10 Component side vie...

Page 31: ... 3 4 5 IC205 L505 L506 L507 IC401 D251 R101 R105 R106 R118 R119 R125 R521 R524 R525 R526 R527 R5 R529 R R534 R535 R536 R537 R538 R151 R152 C517 C518 C526 C527 C528 R1 R35 R2 R36 R3 R37 C532 C534 C535 C536 C537 C538 C539 C151 C152 C540 C541 C543 C545 C559 Q402 Q403 C560 L201 D503 L404 R81 R82 5M IC5 Q252 Q253 Q254 Q255 C10 C13 R200 C15 C16 C17 C18 C19 J1 EXT SP GND PR9 PR1 PKS SQC PKD IC252 1 10 CN...

Page 32: ...C313 R350 C314 R351 C315 R352 C316 C317 R353 R354 C318 R161 R355 C319 R162 C128 R164 R165 R166 C321 C322 C323 C324 C532 R380 C543 C350 C545 C351 C353 C548 C354 TH351 C549 C355 C161 C162 C356 C163 C164 Q201 C165 C550 C551 C555 D302 C556 D303 C559 C560 C564 C567 L401 L403 C570 L404 C574 C575 C576 C579 C580 IC501 C391 TH97 TH98 R203 R204 R205 R206 R207 R208 R209 J72 0907 09 PC 8T 1 4 5 8 1 10 BPF TEM...

Page 33: ...1 R152 R349 C310 C311 C312 C313 R350 C314 R351 C315 R352 C316 C317 R353 R354 C318 R161 R355 C319 R162 C128 R164 R165 R166 C321 C322 C517 C323 C518 C324 C526 C527 C528 R1 R35 R2 R36 R3 R37 C532 C534 C535 C536 C537 C538 R380 C539 C151 C152 C540 C541 C543 C350 C545 C351 C353 C548 C354 TH351 C549 C355 C161 C162 C356 C163 C164 Q201 C165 C550 C551 C555 D302 C556 D303 C559 Q402 Q403 C560 L201 D503 C564 C...

Page 34: ...308 R309 L355 L356 L357 L358 IC251 1 7 8 14 L359 R501 R502 R310 R506 R507 L360 L361 R509 R511 R512 R513 R514 R515 R516 R517 R518 R519 R325 R520 C301 C302 C306 C307 C308 R539 C309 C501 C502 C504 C505 C507 C509 R358 C510 R359 C511 C512 C513 C514 C515 C516 R360 XF351 R361 R362 C326 R363 R364 R365 R366 R367 C520 R369 R370 R371 R372 R373 R374 R375 R376 R377 R378 R381 TH352 C357 C358 C359 C360 D301 C361...

Page 35: ...R62 R63 Q406 D502 0 R70 IC101 L405 L406 L407 L408 L411 R86 L412 R87 L413 L414 5 L416 R91 R92 R93 R94 X86 C14 J72 0907 09 G S D 1 25 26 50 51 75 76 100 G D S G D S B E E B C I O G O G I 33 PC BOARD TM 471A Ref No Address IC31 12Q IC32 13O IC34 13M IC35 13L IC66 11L IC101 11N IC251 12B IC301 12E Q31 5P Q32 4P Q33 12P Q34 12P Q61 4P Q86 10N Q87 10N Q251 11B Q301 13E Q352 10F Q353 10B Q404 12I Q405 12...

Page 36: ... C510 R359 C511 C512 C513 C514 C515 C516 R360 XF351 R361 R362 C326 R363 R364 R365 R366 R367 C520 C521 R369 C522 C523 C524 R370 R371 R31 R32 R372 R33 R373 R374 R34 R375 R376 R377 R4 R378 R38 R39 R5 R6 R7 R8 R40 R41 R381 TH352 C357 C358 C359 C360 D301 C361 C362 C363 C364 R61 R62 C366 C367 R63 Q404 C368 Q405 C369 Q406 Q407 Q408 D502 C370 C371 C372 C373 Q410 R70 C374 IC101 Q411 C375 C376 C377 C378 C37...

Page 37: ...80 R166 1k C233 4 7u6 3 C161 1000p SQC D5 DA221 TH98 100k C230 0 1u L403 10u C450 22u10 L416 C412 10u6 3 C421 470p TH97 100k R410 10k R412 12k C416 470p R411 10k R414 0 C417 470p R419 1k R420 2 2k C424 3 3u10 L406 L407 C426 L408 C427 L409 C429 C430 R423 L410 C431 C432 0 5p R436 L418 27n C454 C455 2p R429 220 R430 220 R431 100k C448 470p R432 1k C433 470p L411 L412 C434 L413 C435 6p TC402 C436 0 5p...

Page 38: ...70p C364 470p R364 0 C367 470p R363 220k C369 L354 C368 D351 HVC350B C370 470p C374 7p C371 L355 C372 D352 HVC350B C373 R366 100k R367 100 C376 470p L357 L356 C375 470p 3SK255 Q353 G1 D S G2 R369 150 C377 470p R371 39k C378 470p R370 47k C379 470p R372 68k C380 470p C393 C381 D353 L358 12 5n R374 100k C382 470p R375 0 C383 0 5p R376 100k C385 470p D354 HVC350B C384 L359 C392 R377 0 C386 0 75p C387...

Page 39: ...T C611 C610 R800 R601 22k C608 C607 0 5p C613 470p D607 MA742 L602 1 5T C620 C603 0 5p R602 22k C614 470p C604 D606 MA742 C605 C602 D604 XB15A709 C601 D605 L601 3 5T D603 D601 MA4PH633 C573 0 01u C572 0 01u C571 470p R539 100 L509 9 5T C580 C570 470p C567 C579 C564 C574 1000p C575 470p C556 470p C576 220p C555 0 47u L508 1 5T C549 C551 30p C548 C550 30p RD60HUF1 01 Q504 C536 470p C535 220p R538 R5...

Page 40: ...Hz 00 440 480MHz 01 C X57 6863 XX C2 C350 NO 470p 3p C456 4p C620 NO 1p R350 27k NO 8n L354 12 5n C472 3p 2 5p C368 7p 10p 47 39 R358 0 75p NO C369 L355 8n 12 5n C502 5p 3p 15k R373 18k C523 47p 27p 18n L356 22n R423 220 330 0 75p 0 5p C371 C524 10p 8p 150 270 R424 20p 15p C372 39n L357 33n C373 8p 10p 15p 12p C527 12 5n L359 8n R436 120k 82k 5p 7p C381 5n L360 8n 8p 47p C540 R439 120k 82k C541 18...

Page 41: ...k C369 L354 C368 D351 HVC350B C370 470p C374 7p C371 L355 C372 D352 HVC350B C373 R366 100k R367 100 C376 470p L357 L356 C375 470p 3SK255 Q353 G1 D S G2 R369 150 C377 470p R371 39k C378 470p R370 47k C379 470p R372 68k C380 470p C393 C381 D353 L358 12 5n R374 100k C382 470p R375 0 C383 0 5p R376 100k C385 470p D354 HVC350B C384 L359 C392 R377 0 C386 0 75p C387 R378 100k L360 C388 6p L361 8n D355 HV...

Page 42: ... BA10324 3 4 IC203 BA10324AFV 1 4 MIC MUTE DTMF BUFF Q1 2SK1824 QT DQT PKD1200 AGC DET D201 DAN222 D202 1SS372 SUM SBC P9M P1M 8RC MIC AMP 8TC AFM SPM QT D DTM TX R CK BSH NAR DT WID PLLE ELVL DI S1 W02 3665 05 ENCODER REV SW CM MIC KEY2 ENCB ENCA CE VFO PTT TXD HOOK RXD SW VR1 R31 0649 05 VIARIABLE RESISTOR SB CL CALL KS1 Q6 KRC102S KI2 Func KS2 LCD Q9 2SB1132 Q R Q12 UMG3N DISPLAY UNIT X54 3450 ...

Page 43: ... AMP 8C SPM Q34 KRC102S 8T DRIVE AMP2 DRIVE AMP1 SB B IF DEMODULATOR AF PA AFM SW MCF Q407 2SJ347 D601 602 MA4PH633 D603 604 XB15A709 SW 8T 8T Q302 2SC2412K TRIPLER APC CONTROL SW D A CONV CV Q503 PD55008 R LPF 8R POW DET POW DET SW D A CONV RF Q408 KRX102U Q86 2SK1830 HPF 5M Q301 2SC2412K IF Q500 2SC5110 O Q504 RD60HUF1 D409 DAN235E EXT SP 16 8MHz Q352 3SK255 Q31 2SA1641 S T RF BPF TUNE RF BPF TU...

Page 44: ...ue required to obtain 12dB SINA G2 W 122 0dBm N 121 5dBm W 119 0dBm N 118 5dBm W 105 5dBm N 104 5dBm W 105 0dBm N 104 0dBm W 118 5dBm N 117 0dBm W 103 0dBm N 101 5dBm W 85 0dBm N 80 5dBm CF1 CF2 W N 5 0mVrms W N 0 12Vrms W N 1 40Vrms W N 1 16Vrms W N 1 26Vrms W N 1 04Vrms W 0 21Vrms N 0 094Vrms W 0 20Vrms N 0 10Vrms X54 345 Display Unit TX RX Unit TX RX Unit To make measurements in the AF section ...

Page 45: ...kHz DEV Wide 1 5kHz DEV Narrow The AF output level is adjusted for a 0 64V 8Ω by the front panel AF VOL control G D409 8ohm 12 Q503 vel meter 12dB SINAD Audio Frequency D602 W 93 0dBm N 91 0dBm CF1 CF2 W N 0 33Vrms W N 0 32Vrms W N 0 27Vrms W N 0 30Vrms W N 0 31Vrms W N 10mVrms W N 0 50Vrms W N 0 64Vrms 0dBm 4 53dBm 5 09dBm 13 8dBm 11 5dBm 18dBm 40W TX RX Unit FINAL Amp TX RX Unit X RX Unit VCO o ...

Page 46: ...T Hong Kong KENWOOD ELECTRONICS TECHNOLOGIES S PTE LTD Sales Marketing Division 1 Ang Mo Kio Street 63 Singapore 569110 TM 471A SPECIFICATIONS GENERAL Frequency Range TX C 400 430MHz C2 440 480MHz RX C 400 430MHz C2 440 480MHz Mode F3E FM Antenna Impedance 50Ω Usable Temperature Range 20 C 60 C 4 F 140 F Power Supply 13 8V DC 15 11 7 15 8V Grounding Method Negative ground Current Transmit max 13A ...

Search results

Summary of Contents for TM-471A

Reviews:

Related manuals for TM-471A

Brands by name

Popular brands

Kenwood TM-471A, Service Manual

Search results

Summary of Contents for TM-471A

Reviews:

Related manuals for TM-471A

Brands by name

Popular brands