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Kenwood TM-271A_271E service manual

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1. Wide 12kHz or more Narrow 10kHz or more 60dB Wide 30kHz or less Narrow 24kHz or less Squelch Sensitivity 0 1 V or less Audio Output 8 5 distortion 2W or higher 5 distortion Audio Output Impedance 8 TRANSMITTER Power Output High K E M2 M3 60W M4 25W Low K E M2 M3 Approx 25W Modulation Reactance modulation Spurious Emissions 60dB or less Maximum Frequency Deviation Wide 5kHz Narrow 2 5kHz Audio Distortion at 60 modulation 3 or less Microphone Impedance 600 Note All specifications General Transmitter and Receiver are guaran teed within the amateur radio band Guarantee K M2 M3 M4 E frequency range
2. F3E FM Antenna Impedance 50 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 K E M2 M3 13A or less M4 8A or less Receive at 2W output 1 0A or less Frequency Stability 20 C 60 C Within 2 5ppm Dimensions W x H x D projections not included 160 x 43 x 137 mm 6 5 16 x 1 11 16 x 5 13 32 inch Weight Approx 1 2kg 2 6lb RECEIVER Circuitry Double conversion superheterodyne Intermediate Frequency 1st 2nd 49 95MHz 450kHz Sensitivity 12dB SINAD Wide 0 18 V or less Narrow 0 22 V or less Selectivity 6dB
3. 53dBm 501 V Digital voltmeter Mod 1kHz Dev 3kHz Adjustment of TX VCO lock voltage 1 Remove R516 F501 R518 and R524 all on component side 2 Remove PCB from chassis 3 Transmit and check voltage at CV point Warning Do not transmit if step 1 is not complete 4 Adjust of voltage can be done by tuning 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 50Hz 2 Transmit knob 2 Maximum 1 CH TX high Power meter VR601 55W 1W power 2 Adjustment HEX value FF alignment 3 Transmit 3 High 1 CH TX low Encoder Low 50W 1 0W power CH TX low knob Low 60W CH TX center Center 60W CH TX high High 50W CH TX high High 50W 2 Transmit 4 Low 1 CH TX low 25W 1 0W power CH TX low CH TX center CH TX high CH TX high 2 Transmit 5 DCS 1 CH TX low Wide Modulation analyzer Adjust the waveform as below balance CH TC center Wide Narrow or Linear detector CH TX high Wide LPF 3kHz 2 Transmit Oscilloscope Item Condition Test equipment Terminal Parts Method Specifications Remarks Measurement Adjustment TM 271A 271E 25 Item Condition Test equipment Terminal Parts Method Specifications Remarks Measurement Adjus
4. appears Press any key other than MENU to cancel 4 Press MENU to reset the transceiver RESETTING THE TRANSCEIVER TM 271A 271E 20 ADJUSTMENT Adjustment Mode In Adjustment Mode the transceiver can adjusted using its panel keys Items that can be adjusted in Adjustment Mode 1 1 Frequency Tune 2 Transmit High Power 2 3 Transmit Low Power 2 4 DCS Balance 3 5 Max Deviation 3 6 CTCSS Fine Deviation 3 q Blinks in Adjustment Mode w Adjustment item display e Adjustment value display Can be adjusted while it is blinking Displayed as a hexadecimal number from 00 to FF r Adjustment value stored in memory When an adjustment value is determined it is equal to the value in 3 Panel Key Operation Method in Adjustment Mode q Power switch Volume control w When the knob is pressed once the adjustment value dis play blinks Select an adjustment item with 4 or 5 key before performing the operation It cannot be per formed while transmitting When the knob is rotated while the adjustment display is blinking the adjustment value changes Adjust transmis sion items while transmitting When the knob is pressed again the adjustment value stops blinking and lights and the adjustment value is saved in the memory of the transceiver For transmission item adjustment enter receive mode before performing the operation e Changing between adjustment value display and fre
5. 9 10 11 12 13 14 1 2 3 4 5 6 7 8 9 10 11 12 13 14 D2 COM3 COM2 COM3 COM0 SEG31 SEG30 SEG29 SEG28 SEG27 SEG26 SEG25 SEG24 SEG23 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17 SEG16 SEG15 SEG14 SEG13 SEG12 SEG11 SEG10 SEG9 SEG8 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 SEG0 D3 D4 J1 MIC JACK D19 D20 D21 CALL VFO MR REV FUNCTION D22 D23 D24 D25 D26 D27 D28 D29 D30 S1 ENCODER J72 0905 09 J72 0905 09 VR1 POWER VOL R47 R48 C22 C24 C25 C27 C30 C31 C32 C33 C34 C35 C36 C38 C39 8C 8C PTT PTT MIC MIC CM CM MBL MBL GND GND ME ME HOOK HOOK 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 271A 271E 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 view J72 0905 09 DISPLAY UNIT X54 3450 10 Foil side view J72 0905 09 DISPLA
6. AGC DTMF Q201 2SC4919 VCO Q403 2SC4738 GR TCXO D A CONV WID POWER NAR MIC IC161 M62363FP 3 8 CHARGE PUMP CHARGE PUMP 16 8MHz IC161 M62363FP 8 8 8TC BRI SQIN 8C CM SPLATTER FILTER 8C 8C MIC KEY MIC IDC Q404 2SC4649 N P 16 8MHz MIC PTT TXD DO ENCB KI3 ME Q407 2SJ347 IC401 MB15A02 LD DT VOL T CV 5C Q402 2SA1832 GR CL KI2 DTM Q10 KRA225S 5C Q6 KRC102S V PLLE DISPLAY UNIT X54 3450 10 Q 2SK50 MICMT D19 30 B30 2205 05 LCD BACK LIGHT Q9 2SB1132 Q R Q12 UMG3N SW MBL BRI IC3 LCD DRIVER LC75854W LC75854W CL CE DI COM0 3 SEG0 31 MBL DO LCD GND ME MIC Q1 2SK1824 X401 QT D TX R SPM AFM AMP PTT TXD Func CALL VFO REV MR KI1 KI2 KI3 KS2 KS1 SQC PKS PR1 PR9 PKD VR1 R31 0649 05 VIARIABLE RESISTOR POWER D A CONV IC161 M62363FP 4 8 P9MT P1MT PKD1200 PKD9600 VOL P9M QT DQT PKD9600 IC205 BU4S66 SW IC204 BU4S66 SW ENCB MHz ENCA S1 W02 3665 05 ENCODER PKD1200 BLOCK DIAGRAM TM 271A 271E 39 BLOCK DIAGRAM DT Q33 2SA1745 6 7 CF302 NARROW D303 DAN222 P1MT SW 8TC AVR 5V X351 49 95MHz 8RC OVER VOLTAGE DETECT IC66 AT24C64A10SI18 or CAT24WC64J1 RF IC402 UPB1509GV DIVIDER D302 DAN222
7. SQIN CPU93 WIDE CPU65 B TXD DT CPU53 HPF RXD TX RX UNIT X57 685X XX OVER VOLTAGE DETECTION E VOLTAGE REGULATOR 8C W NO EVOL2 RF SWITCH REVERSE CONNECTION PROTECTION DI PLLE CPU3 NARROW FROO EVOL23 APC CONTROLLER UL CPU21 CK CPU54 FINAL AMP PLLE CPU3 8CL D603 605 8CL LIPPLE FILTER DIGITAL POTENTIOMETER TEMPERATURE COMPENSATION NARROW CPU64 1 2Vcc D31 TV RX VCO MODI EVOL9 TX VCO 5M D351 352 LIMITTER KDC PC TV SW IF SWITCH RF BPF TUNING KEC PC D353 354 IF AMP 8T KEC Q402 403 Q35 36 APC VOLTAGE DETECT D405 406 BEAT SHIFT BUFFER AMP VOLTAGE DETECTOR RESET D606 607 8C D403 404 50 4MHz ANT SW ANT SW D1 4 VOLTAGE REGULATOR 5M 8TC CPU80 8RC CPU76 D32 CV D501 DRIVE AMP 8R RX 8R IF SWITCH 1 1A W NI EVOL1 EEPROM RF AMP MIC AMP SPLATTER FILTER 5C MOD DETECTION MODULATION 8C VOLTAGE DETECTOR INT 1 2Vcc CPU DC SW SB 8C AGC MIC MUTE AFV AF MUTE AF MUTE W NO EVOL2 NOISE AMP SQL AMP T R SW AFI EVOL12 DIVIDER HETERO VOLTAGE PROTECTION PLL IC KEC AFM CPU50 D407 T R SW Q33 34 KEC 8C SB OVER VOLTAGE DETECTION 16 8MHz BEAT SHIFT MOD LIPPLE FILTER RF AMP VOLTAGE REGULATOR 5C WIDE SURGE ABSORPTI
8. TC401 10p R416 470 C41 22u10 C268 1u R229 680k C361 1000p C215 0 1u R606 220 C432 0 3p R101 47k R376 100k C307 0 022u R166 1k C45 22u10 C530 0 47u 8C C319 1000p C281 1000p R509 22 C213 3300p C312 0 1u R526 150 R37 0 TH301 100k R514 0 L304 330n 8R 5C 5C C231 1000p C233 4 7u6 3 C310 0 33u C467 1000p L404 R162 1 5k R278 12k C52 1000p C515 27p 8T D409 DAN235E L604 5T 8T R419 2 7k R218 82k C465 22p R34 4 7k R521 100 C87 3p C44 22u10 C372 1000p C363 0 01u R268 1k R359 220k R319 10k C456 2p C507 1000p R208 1 5k C459 1000p R271 3 3k 8T C34 330u 25 C324 0 01u C450 22u10 L509 9 5T R211 82k R39 470k Q254 DTC363EU C366 0 1u R257 1M C387 1000p R426 47k R233 6 8k R360 470k R255 5 6k C278 0 1u KTA1664 Y Q35 C227 0 01u R230 220k R421 1 5k R351 470 68 5C R207 D404 MA2S304 C54 0 1u D403 MA2S304 L508 2 5T C428 470p 8R 69 5M D608 1SS355 C421 470p R106 1k C314 0 01u 34 D602 MA4PH633 R306 270k L302 330n CNVSS C410 10u6 3 C606 0 5p D303 DAN222 C448 470p R366 4
9. 1 8 R41 56 CP1 R90 0724 05 C35 4700p D24 B30 2205 05 R54 56 C39 0 1u D2 C22 1000p Q6 KRC102S C40 0 1u L1 R44 18k CN1 R21 10k D30 B30 2205 05 R46 100 D31 1SS355 C27 1000p R51 0 D3 B30 2205 05 R23 10k R25 56k D4 C38 470p D22 B30 2205 05 C36 1u D23 B30 2205 05 R10 1 2k R48 47k R26 3 9k D19 B30 2205 05 R49 56 C32 1000p C24 0 1u C31 1000p R42 2 7k Q10 KRA225S R47 47k D25 B30 2205 05 R45 33k C16 100p BL NC NC NC SEG0 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 NC 50 KI1 51 KI2 52 KI3 53 NC 54 NC 55 NC 56 VDD 57 VDD1 58 VDD2 59 VSS 60 OSC 61 DO to cpu 62 CE 63 CL 64 DI from cpu C34 4700p D29 B30 2205 05 D20 B30 2205 05 R53 0 D27 B30 2205 05 R22 10k VR1 R31 0646 05 R50 56 C30 0 1u R52 0 D28 B30 2205 05 R8 1k S1 W02 3665 05 SEG9 SEG15 SEG7 SEG10 SEG23 SEG3 SEG21 SEG11 COM2 SEG13 COM1 RESISTOR COM3 SEG24 KEY ILLUMINATION SEG1 LCD B38 0885 05
10. 1u C61 1000p D32 1812L110PR L602 5T R254 2 7k 89 C574 1000p C554 1000p R312 47k C53 1000p C560 1000p C613 27p C576 220p C265 0 1u R256 5 6k C51 10u6 3 D503 02DZ5 1 Y C280 47u16 R602 22k R313 100k 17 5C C389 1000p L506 9 5T C279 4 7u16 R601 22k R279 4 7k 87 R310 1k R263 91k BSB L507 1T R379 100k C253 0 22u C262 1000p R532 0 D607 MA742 R518 33 R35 47k Q34 KRC102S C40 0 1u R274 15k R62 0 C273 1u C611 2p C56 1000p R525 56k R529 470 R253 0 8T C558 0 01u R31 4 7k C549 220p R40 390k Q255 KRC102S R528 470 C35 1000p C525 1000p D31 ZSH5MA27 R272 3 9k R524 470 Q61 KRC404RTK R264 120k R38 330k 8T 2 COM 1 IN 3 OUT C556 1000p C252 39p 8R C50 0 01u C255 8200p 8C C309 0 022u C283 1000p C37 1000p R303 22k IC501 TA75W01FU 1 2 3 4 VEE 5 6 7 8 VCC D605 XB15A709 C261 0 01u R309 3 3k R262 18k C256 0 018u R311 33k C607 2p C303 4700p R260 220k C30 1000p C528 220p R32 470 C264 0 033u R280 390 C555 5p R4 1k R2 100 R3 100 CN1 R7 1k R5 1k R8 1k R6 1k C1
11. 2003 10 PRINTED IN JAPAN B51 8663 00 N 743 VHF FM TRANSCEIVER TM 271A 271E 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 685X XX 30 SCHEMATIC DIAGRAM 34 BLOCK DIAGRAM 38 LEVEL DIAGRAM 40 SPECIFICATION BACK COVER CONTENTS Microphone T91 0624 05 Cabinet A01 2193 01 Panel assy A62 1088 03 Knob Encoder K29 9293 03 Knob Volume K29 9292 03 Key top K29 9291 01 Microphone T91 0641 05 Cabinet A01 2193 01 Panel assy A62 1088 03 Knob Encoder K29 9293 03 Knob Volume K29 9292 03 Key top K29 9291 01 TM 271A M2 M4 TM 271A E K M3 E TM 271A 271E 2 Frequency Configuration The receiver utilizes double conversion The first IF is 49 95MHz and the second IF is 450kHz The first local oscil lator signal is supplied from the PLL circuit The PLL
12. 470 C375 1000p R403 1k C83 0 1u C451 470p C468 220p C315 0 1u C424 1u16 L502 68n IC401 MB15A02 11 12 13 14 15 16 17 18 19 20 C380 100p L419 100n R219 180k R110 47k C210 0 1u C454 6p R443 2 2k C417 1000p R441 100 R524 470 Q61 KRC404RTK 8R R228 10k C457 1000p L403 10u R264 120k R38 330k C501 1000p R352 100 R362 470k 8T C506 1000p 2 COM 1 IN 3 OUT R316 22k C556 1000p R226 100k C82 1000p C362 1000p R354 330 R249 15k C503 100p D408 MA2S111 D402 HZU5ALL C401 100p C206 R215 68k C252 39p 8R C517 3p C50 0 01u C255 8200p C370 1000p 8C R318 10k R501 1k C201 0 1u C309 0 022u C283 1000p C359 8p C37 1000p R303 22k C90 3p R439 47k C226 4700p R365 100k IC501 TA75W01FU 1 2 3 4 VEE 5 6 7 8 VCC D605 XB15A709 C152 3900p C261 0 01u C431 5p R368 100k R506 10k L351 820n C202 1000p R323 120k C211 820p C404 15u6 3 R309 3 3k R507 10 2SC4649 N P Q411 C162 4 7u6 3 R216 270k R432 1k R408 10 R262 18k R204 C256 0 018u R311 33k C449 470p C607 2p C303 4
13. 8T Q61 KRC404RTK Q302 2SC2412K TRIPLER INT TEMP1 APC CONTROL SW RXD TCXOMOD D A CONV CM CV R LPF 8R POW DET POW DET SW D A CONV RF Q503 PD55003 Q408 KRX102U Q86 2SK1830 T R SW HPF DTMF 5M Q301 2SC2412K IF Q501 2SC3357 D409 DAN235E EXT SP 16 8MHz Q352 3SK318 Q31 2SA1641 S T RX VCO RF BPF TUNE RF BPF TUNE 8R SP Q502 2SC3357 Q405 2SK508NV K52 EEPWP EEPCK EESDT IC301 SW Q255 KRC102S AMPSW Q354 2SK1830 SW 8T QT DQT TX RX SPM AFM AMPSW CL CE DI RSSI SQIN 8C 8M PKS SQC ENCA ENCB VOL P9MT DO MICKEY2 MICKEY RESET TM 271A 271E 40 LEVEL DIAGRAM To make G2 Q351 3 IC201 IC203 Q353 XF1 7 IC202 IC202 BPF BPF 6 8 Q406 ANT X54 345 G2 9 1 To make measurements in the RF section connect the RF level meter In the RF section use a 0 01 F coupling capacitor The display shows the SSG input value required to obtain 12dB SINA 1 G1 2 2 S Q352 10 Display Unit D IC161 TX RX U MIC To make measurements in the AF section connect the AC level meter AG is set so that MIC input becomes 3kHz 1 5kHz Wide Narrow DEV at 1kHz MOD D CF1 CF2 450kHz 7 IC203 TX RX Unit S IC301 5 49 95MHz 9 IC201 G1 20 1 Center Frequency W 124 0dBm N 123
14. C14 J72 0906 09 1 25 26 50 51 75 76 100 B E O G I I O G 33 PC BOARD TM 271A 271E Ref No Address IC31 12Q IC32 13O IC34 13M IC35 13L IC66 11L IC101 11N IC251 12B IC301 12E IC402 13G 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 12I Q406 13J Q407 12I Q408 11H Q410 12I Q411 12G Q440 12H Q501 10I Q502 10K D1 12O D2 11O D31 4N D32 5Q D61 4P D62 4P D301 13F D351 10D D352 10C D353 9B D354 8B D403 11K D404 11J D405 13K D406 12K D407 12K D408 12H D409 10G D501 10I D502 10J D605 7B D606 5B D607 4B TX RX UNIT X57 685X XX Foil side view J72 0906 09 0 10 TM 271A K 0 21 TM 271A M2 0 22 TM 271A M3 0 23 TM 271A M4 2 71 TM 271E E Component side Foil side Layer 1 Layer 2 Layer 3 Layer 4 J K L M N O P Q R S I H G F E D C B A 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 8 9 10 11 12 13 14 CF301 CF302 R601 R602 C30 C33 C34 R415 C35 C36 R416 C37 R417 C38 C39 IC31 IC32 IC34 IC35 1 3 4 5 1 3 4 5 C40 C41 C42 R423 C43 R424 R425 R426 R427 R428 R429 R800 ANT R430 R431 R432 R433 C53 R434 C54
15. D354 S D G2 G1 1 4 5 8 32 TM 271A 271E PC BOARD TX RX UNIT X57 685X XX Foil side view J72 0906 09 0 10 TM 271A K 0 21 TM 271A M2 0 22 TM 271A M3 0 23 TM 271A M4 2 71 TM 271E E J K L M N O P Q R S 1 2 3 4 5 6 7 8 9 10 11 12 13 14 C30 C33 C34 C35 C36 C37 C38 C39 IC31 IC32 IC34 IC35 1 3 4 5 1 3 4 5 C40 C41 C42 C43 R426 R427 R428 R429 C53 C54 C55 C56 C61 C66 IC66 1 4 5 8 TC401 TC402 C426 C427 Q31 E B C Q32 C87 Q33 Q34 C88 C89 C434 C90 C435 C436 C437 C438 C439 R281 C440 1 C444 D1 D2 2 Q61 L101 D403 D404 Q501 D405 Q502 B C E D406 D407 C279 C280 C282 C283 L501 L502 Q86 G D S G D S Q87 R102 R103 R104 R109 R110 R111 R114 R507 R509 R123 R124 R126 R127 D31 R511 D32 R512 R513 R514 R522 C101 C102 C104 D61 D62 C507 C509 C510 C511 C512 C513 C515 C526 R31 R32 R33 R34 R4 R38 R5 R39 R6 R7 R8 R40 R41 R61 R62 R63 Q406 G S D D502 R70 0 IC101 L405 L406 L407 L408 L411 L412 R86 L413 R87 L414 5 L416 R91 R92 R93 R94 X86
16. 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 271A 271E PC BOARD DISPLAY UNIT X54 3450 10 Component side view J72 0905 09 DISPLAY UNIT X54 3450 10 Foil side view J72 0905 09 J K L M N O P Q R S 1 2 3 4 5 6 7 8 9 10 11 12 13 14 SEG9 SEG8 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 SEG0 D3 D4 REV FUNCTION D23 D24 D29 D30 S1 ENCODER J72 0905 09 J72 0905 09 R47 R48 C22 C25 C27 C32 C34 C35 Q10 Q12 1 2 3 5 L1 R10 R26 Q6 Q9 B C E R8 R41 R42 R43 R44 R45 R49 R50 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 271A 271E 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 D29 3J D30 3K Ref No Address IC3 11H Q6 10M Q9 11M Q10 10N Q12 10N D31 9C J K L M N O P Q R S I H G F E D C B A 1 2 3 4 5 6 7 8
17. R526 C104 C301 C302 C306 C307 C308 C309 C501 C502 C503 C504 C505 D61 C506 D62 C507 C509 R356 C510 R358 R359 C511 C512 C513 C515 R360 R361 XF351 C326 R362 R363 R364 R365 R366 R367 R368 R369 C526 R370 R31 R371 R32 R372 R373 R33 R374 R34 R375 R376 R4 R38 R5 R39 R6 R7 R8 R40 R41 C357 C358 C359 C360 C361 D301 C362 C556 C363 C557 C544 C543 C364 C558 R61 C366 R62 C367 R63 C368 Q404 C369 Q405 G S D Q406 G S D Q407 G S D Q408 1 2 3 5 D501 D502 C370 C371 C372 C373 R70 Q410 C374 Q411 IC101 C375 C376 C377 C378 C379 L405 L406 L407 L408 C380 C381 IC301 1 10 11 20 L409 C382 C383 C384 C385 L601 C386 L602 C387 L603 C388 L410 L604 L411 L605 L412 R86 L413 R87 L414 L415 L416 L417 L418 C390 L419 C391 R91 R92 R93 R94 L420 L421 L422 L423 Q440 Q251 X86 D351 D352 D353 D354 C14 J72 0906 09 S D G2 G1 1 4 5 8 1 25 26 50 51 75 76 100 B E O G I I O G 32 33 TM 271A 271E PC BOARD PC BOARD TM 271A 271E Ref No Address IC31 12Q IC32
18. WP VCC SQIN CPU93 SBC CPU82 RESET CPU10 INT CPU18 1 2Vcc DTMF IN CPU95 RSSI CPU92 IC301 TK14489V SCAN SCAN SQLIN FLAMPO RFIN GND Hy_C FLAMPI RSSI AFO VCC IF_IN DEC1 DEC2 PH_S QUCO OSC B OSC E NC MIX_O 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 2SB1132 Q R Q9 IC3 LC75854W or PT6554LQ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 SEG28 SEG29 SEG30 SEG31 NC NC NC COM0 COM1 COM2 COM3 KS1 KS2 NC NC NC SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 SEG20 SEG20 SEG22 SEG23 SEG24 SEG25 SEG26 SEG27 C203 0 027u 0 027u 0 047u 0 027u 0 027u 1000p 1000p 680p 1000p C206 1000p 0 022u 0 022u 0 022u 0 022u C207 0 039u NO C614 3p NO NO NO 0 0 R119 0 NO 0 0 0 NO R120 NO NO 0 R121 0 NO NO NO 10k 18k R204 18k 18k 18k 1M 750k 750k 750k 750k R207 XF351 49 95MHz L71 0620 05 CF301 L72 0993 05 CF302 L72 0999 05 C259 0 01u C260 0 01u C270 4 7u6 3 R55 0 R 3 22V R 4 65V T 1 6V R 4 02V R 4 27V T 4 16V R 13 8V T 13 45V T 1 45V R 0 66V T 0 48V R 4 98V R 2 7V R 7 9V R 13 8V
19. 0 10UF K C560 CK73GB1H102K CHIP C 1000PF K C574 CK73GB1H102K CHIP C 1000PF K C576 CK73GB1H221K CHIP C 220PF K C602 C93 0561 05 CHIP C 12PF J C603 C93 0603 05 CHIP C 1000PF K C605 C93 0562 05 CHIP C 15PF J C606 CC73GCH1H0R5B CHIP C 0 5PF B C607 CC73GCH1H020B CHIP C 2 0PF B C608 C93 0565 05 CHIP C 27PF J C610 CC73GCH1H0R5B CHIP C 0 5PF B C611 CC73GCH1H020B CHIP C 2 0PF B C613 C93 0565 05 CHIP C 27PF J C614 C93 0553 05 CHIP C 3 0PF C E C615 C93 0564 05 CHIP C 22PF J C616 617 CK73GB1H102K CHIP C 1000PF K C623 C93 0553 05 CHIP C 3 0PF C TC401 C05 0399 05 CERAMIC TRIMMER 6PF TC402 C05 0245 05 CERAMIC TRIMMER 10PF E11 0425 05 3 5D PHONE JACK 3P E37 1127 05 PROCESSED LEAD WIRE CN1 E40 6268 05 FLAT CABLE CONNECTOR CN2 E40 5705 05 PIN ASSY CN5 E40 3246 05 PIN ASSY F1 F53 0246 05 FUSE 4 0A 32V F501 F53 0108 05 FUSE 1 8A 50V CF301 L72 0993 05 CERAMIC FILTER CF302 L72 0999 05 CERAMIC FILTER L101 L92 0443 05 FERRITE CHIP L201 L92 0443 05 FERRITE CHIP L301 L34 4554 05 COIL L302 L41 3385 08 SMALL FIXED INDUCTOR L303 304 L40 3381 86 SMALL FIXED INDUCTOR 0 33UH L351 L41 8285 08 SMALL FIXED INDUCTOR L352 L41 5685 08 SMALL FIXED INDUCTOR L354 356 L34 4612 05 AIR CORE COIL L357 L34 4610 05 AIR CORE COIL L401 L92 0443 05 FERRITE CHIP L403 L41 1005 08 SMALL FIXED INDUCTOR L404 L92 0442 05 FERRITE CHIP L405 L92 0443
20. According to the large 2 AG 1kHz 50mV Oscilloscope 3 Transmit AG AF V M 7 MIC 1 CH TX center Narrow Check 1 2 1 9kHz sensitivity 2 AG 1kHz 5 4mV TM 271A Narrow AG 1kHz 2 4mV TM 271E 3 Transmit 8 CTCSS 1 CH TX low Wide Modulation analyzer Encoder 0 75kHz Wide 50Hz fine CH TX center Wide Narrow or Linear detector knob 0 35kHz Narrow deviation CH TX high Wide LPF 3kHz 2 Transmit Oscilloscope 9 DCS fine 1 CH TX low Wide 0 75kHz Wide 50Hz Wide deviation CH TX center Wide Narrow 0 35kHz Narrow 40Hz Narrow CH TX high Wide 2 Transmit 10 DTMF 1 CH TX center Wide Narrow 3 0kHz Wide 200Hz Wide fine 2 Transmit 1 5kHz Narrow 100Hz Narrow deviation Receiver Section 1 Band pass 1 CH RX low Wide SSG ANT Encoder Adjust to maximum SINAD SINAD tuning CH RX center Wide Narrow Oscilloscope EXT SP knob 12dB or higher CH RX high Wide AF V M 2 SSG output Distortion meter 121dBm 0 2 V Wide 119dBm 0 25 V Narrow Mod 1kHz Dev 3 0kHz Wide Dev 1 5kHz Narrow Item Condition Test equipment Terminal Parts Method Specifications Remarks Measurement Adjustment TM 271A 271E 26 2 Squelch 1 CH RX low Wide SSG ANT Encoder Adjust to open the squelch tight CH RX center Wide Narrow Oscilloscope EXT SP knob CH RX high Wide AF
21. C458 220p C268 1u C361 1000p R101 47k R376 100k C319 1000p R509 22 C312 0 1u R514 0 L304 330n C467 1000p C515 27p D409 DAN235E 8T C465 22p C372 1000p C363 0 01u R268 1k R359 220k R319 10k C456 2p C507 1000p C459 1000p C324 0 01u C366 0 1u C387 1000p R360 470k R351 470 8R 69 R106 1k C314 0 01u 34 L302 330n CNVSS D303 DAN222 R366 470 R438 22k C311 0 1u C364 1000p R370 56 C504 1000p R510 1 5k L501 68n C384 2p 5M C463 1000p C151 1800p 5M R315 18k C519 82p C383 1000p R369 0 R444 1k C101 1000p R109 1 5k IC66 AT24C64A10SI18 or CAT24WC64JI 1 A0 2 A1 3 A2 4 GND 5 6 7 8 R442 100 IC402 UPB1509GV 1 2 3 4 5 6 7 8 R516 0 C104 0 1u R356 1k 5M R317 10k 5M R105 1k L303 330n 8R R504 270 C371 2p R111 1k R102 47k R511 47 C505 1000p R437 1k R325 33k C513 1000p R503 18 C358 1000p L101 C322 56p C460 18p C512 1000p 5C L301 L34 4554 05 8C 8C R81 47k 5C R123 0 C378 1000p D502 DA221 C302 1000p R70 47k 71 R104 1k L420 150n R321 22k C351 33p R502 270 R82 0
22. CC73GCH1H331J CHIP C 330PF J C306 CK73GB1H102K CHIP C 1000PF K C307 CK73GB1E223K CHIP C 0 022UF K C308 CK73GB1H102K CHIP C 1000PF K C309 CK73GB1E223K CHIP C 0 022UF K TX RX UNIT X57 685X XX 0 10 K 0 21 M2 0 22 M3 0 23 M4 2 71 E TM 271A 271E 12 PARTS LIST K M2 M3 M4 TM 271A E TM 271E Ref No Address Parts No Description Desti nation New parts Ref No Address Parts No Description Desti nation New parts TX RX UNIT X57 685X XX C310 CK73FB1C334K CHIP C 0 33UF K C311 312 CK73GB1C104K CHIP C 0 10UF K C313 C92 0662 05 CHIP TAN 15UF 6 3WV C314 CK73GB1H103K CHIP C 0 010UF K C315 318 CK73GB1C104K CHIP C 0 10UF K C319 CK73GB1H102K CHIP C 1000PF K C321 CC73GCH1H680J CHIP C 68PF J C322 CC73GCH1H560J CHIP C 56PF J C323 CC73GCH1H271J CHIP C 270PF J C324 CK73GB1H103K CHIP C 0 010UF K C326 CK73GB1H103K CHIP C 0 010UF K C350 CK73GB1H471K CHIP C 470PF K C351 CC73GCH1H330J CHIP C 33PF J C353 CK73GB1H103K CHIP C 0 010UF K C354 CC73GCH1H4R5B CHIP C 4 5PF B C355 CC73GCH1H180J CHIP C 18PF J C356 CC73GCH1H030B CHIP C 3 0PF B C357 CK73GB1H103K CHIP C 0 010UF K C358 CK73GB1H102K CHIP C 1000PF K C359 CC73GCH1H080B CHIP C 8 0PF B C360 362 CK73GB1H102K CHIP C 1000PF K C363 CK73GB1H103K CHIP C 0 010UF K C364 CK73GB1H102K CHIP C 1000PF K C366 CK73GB1C104K CHIP C 0 10UF K C367 CC73GCH1H151
23. DI QT DQT CPU1 DTMO EVOL15 IC101 CPU TONE DTMF Fig 10 Control circuit Fig 11 Memory circuit Q10 SW Q6 SW IC101 CPU D2 D4 Q9 SW D19 D30 Q12 SW IC3 LCD driver CE CL DI DO BL COM0 COM3 SEG0 SEG30 LCD BRI Fig 12 Display circuit Fig 13 Key matrix circuit Fig 14 Encoder CIRCUIT DESCRIPTION TM 271A 271E 6 Decode CTCSS DCS The signal W NO EVOL2 goes to DTMF IN pin 95 of CPU IC101 The CTCSS DCS signal will pass through the low pass filters in the CPU IC101 and be decoded within the CPU IC101 The DTMF signal will be decoded within the CPU IC101 D A Converter The D A converter IC161 is used to adjust MO modula tion AF volume TV voltage FC reference voltage and PC POWER CONTROL voltage level Adjustment values are sent from the CPU as serial data The D A converter has a resolution of 256 and the following relationship is valid D A output Vin VDAref 256 x n VDAref Vin Analog input VDAref D A reference voltage n Serial data value from the microprocessor CPU Power Supply Circuit When the power switch on the display unit is pressed the power port on the display unit which is connected port 17 POWER goes low then port 82 SBC goes high Q32 turns on SB SW Q31 turns on and power SB is supplied to the radio When the DC power supplied to the radio the voltage regulator IC IC33 supply into
24. PC ANT Q87 2SK1830 IC203 BA10324AFV 3 4 BUFF Vg V BUFFER D301 MA742 PLLE INT Vg 450kHz SW BPF IC252 LA4600 NOISE D A CONV IC501 TA75W01FU 1 2 IC501 TA75W01FU 2 2 WIDE ANT SW ELVLLD SW POWER PRE DRIVE AMP RF BUFF Q351 2SC5108 Y VCOMOD CL SW CF301 WIDE D351 352 HVC376B 8RC CK IC251 BA10324AFV Q353 3SK318 SBC TXRX 8C IC31 KIA7808AF AVR 8V TEMP2 MIX SW 5M AF FILTER TX VCO SW Q411 2SC4649 N P Q410 2SC5108 Y SW 8T 8CL D353 354 HVC376B 5C BSHIFT BSHIFT 8R SW SW Q504 RD70HVF1 E Q35 KTA1664 Y D607 MA742 D606 MA742 50 4MHz B DET SW 8R IC32 NJM78L05UA 5M SW VCOMOD R WIDE NARROW EEPROM Q252 253 2SK3019 8R RESET NARROW D A CONV IC33 NJM78L05UA AVR IC161 M62363FP 7 8 3FP BPF Q36 KRC102S Q254 DTC363EU IC161 M62363FP 2 8 8T Q406 2SK508NV K52 IC35 BD4740G 5C RESET X86 IC161 M62363FP 5 8 6 8 IC161 M62363FP 1 8 IC34 BD4732G DTMF BEEP 8TC SQIN Q32 KRC102S SBC Q251 2SC2412K PTT FINAL AMP 8C SPM MICMT SIGNAL Q34 KRC102S 8T DRIVE AMP SB B IF DEMODULATOR AF PA AFM SW CPU IC101 30622MAA B85GP MCF INT Q407 2SJ347 D602 MA4PH633 D603 605 XB15A709 SW 8T
25. PKS CLKFLS BSYFLS TXD RXD PTT NC NC NC EMPFLS NC NC NC NC CEFLS NC NC NC NC NC AFM EEPWP NC SPM AMPSW DT CK NC DST1 DST2 DST3 DST4 VCC NC VSS ADJ NARROW WIDE NC NC CL CE DO to LCD DI from LCD NC ENCB ENCA P9MT 99 100 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 SPM CPU51 AMPSW CPU52 W NI EVOL1 VOLI EVOL12 SW1 SW2 OUT VCC2 VCC1 IN IN GND RD70HVF1 01 Q504 AMPSW CPU52 MIC 8TC CPU80 SPM CPU51 8RC CPU76 BRI PC TV VOLO EVOL11 W NO EVOL2 2SC2412K Q301 8 9 10 11 12 13 14 IC251 BA10324AFV DTMF IN CPU95 INT CPU18 RESET CPU10 SBC CPU82 1 2Vcc SQIN CPU93 INT CPU18 RESET CPU10 SBC CPU82 IC35 BD4740G IC31 KIA7808AF IC32 NJM78L05UA AMPSW CPU52 VOLO EVOL11 SPM CPU51 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Func CALL VFO REV CM HOOK MIC ME PTT GND 8C MBL Key A ENCODER A CM ENCODER B MIC KEY DI from LCD CE CL DO 5C 8C VOL POWER RXD BRI PTT GND ME MIC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 SDA SCL
26. quency display The display changes as follows Adjustment value display Transmit frequency display Receive frequency dis play Adjustment value display The frequency for adjustment can be confirmed r Moves the adjustment item backward If it is operated when a frequency is displayed the adjustment item 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 contact due to rust or stain voltage may drop occur frequently and correct trans mission power may not be supplied In this case polish the DC cable connector If the problem still persists replace the DC cable with a new one r w e q TM 271 MENU q w e r t y u TX RX unit Component side 7 DCS Fine Deviation 3 8 DTMF Fine Deviation 9 Band Pass Tuning 4 10 Squelch Tight 5 11 Squelch Open 5 12 S Meter S1 Level 13 S Meter Full Level Note 1 The PLL lock voltage and Max Power Alignment for transmission cannot be adjusted in Adjustment Mode 2 Adjusted in 5 points in the transmission operating fre quency range 3 Adjusted in 3 points for the Wide Band Width in the tr
27. 0 10 0 21 0 22 2 71 1 2 3 4 5 6 7 8 9 10 CLK NC3 DATA LE FC NC4 FOUT P NC5 R OSCIN NC1 OSCOUT VP VCC DO GND LD NC2 FIN 2SC4649 N P Q404 2SK508NV K52 Q406 2SJ347 Q407 2SK508NV K52 Q405 2SC5108 Y Q410 Q408 KRX102U 2SC2412K Q440 CONT VDD 2SK1830 Q87 X86 8 00MHz L78 1409 05 2SK1830 Q86 8 9 10 11 12 13 14 1 2 3 4 5 6 7 2VOLI 2VOLO BLO BLI 1VOLI 1VOLO DO VDFref RESET GND FRQI FRQO PC TVO PC TVI VDD LD CLK DAT MODI MODO W NO W NI BRII BRIO QT DQT CPU1 1 2Vcc EVLLD CPU8 UL CPU21 PLLE CPU3 M1MT CPU76 XOUT CPU11 XIN CPU13 TX DTMF BSHIFT P9MT CPU75 MICMT CPU77 TX RX CPU20 W NO EVOL2 W NI EVOL1 MIC VOLO EVOL11 VOLI EVOL12 DT CPU53 CK CPU54 BRI PLLE CPU3 MODO EVOL10 PC TV UL CPU21 PC TVO EVOL3 EVLLD CPU8 P9MT CPU75 MICMT CPU77 MOD TX RX CPU20 TX RX CPU20 QT DQT CPU1 EVLLD CPU8 TX DTMF UL CPU21 PLLE CPU3 XOUT CPU11 XIN CPU13 POWER M1MT CPU76 P9MT CPU75 MICMT CPU77 CK CPU54 DT CPU53 W NO EVOL2 PC TV W NI EVOL1 MIC VOLI EVOL12 VOLO EVOL11 BRI SQIN CPU93 RSSI CPU92 SBC CPU82 1 2Vcc DTMF IN CPU95 BSHIFT IC101 30622MAA B85GP NC SQC
28. 05 49 Microphone T91 0624 05 M2 M4 704 Pamphlet 705 Warranty card 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 1995 12 K M2 H52 2027 02 M3 H52 2028 02 M4 H52 2029 12 E 50 Microphone T91 0641 05 K M3 E 11 DC cord E30 3452 05 E 20 Fuse 6x30 15A F51 0017 05 K M2 M3 M4 TM 271A 271E 19 Resetting the Tansceiver If your transceiver seems to be malfunctioning resetting the microprocessor may solve the problem The following 2 reset modes are available When performing the reset you may lose memory data and stored information Back up or write down important data before performing the reset Initial Settings The factory defaults for the operating frequencies are as follows Transceiver 144 000MHz The Memory Channels have no data stored The Weather Radio frequency AL channel is restored as 162 550MHz K market model only The Call Channel and frequency step size default values Note When in Channel Display Mode or while Key Lock is activated you cannot perform VFO reset or Full reset Full Reset This resets all transceiver parameters to the factory de fault values There are two methods available for resetting the transceiver Full Reset Method 1
29. 05 FERRITE CHIP L406 407 L40 2785 92 SMALL FIXED INDUCTOR 270NH L408 L40 3378 67 SMALL FIXED INDUCTOR 33NH L409 410 L40 2702 86 SMALL FIXED INDUCTOR 27UH L411 412 L40 2785 92 SMALL FIXED INDUCTOR 270NH L413 L40 4778 67 SMALL FIXED INDUCTOR 47NH L414 415 L40 2702 86 SMALL FIXED INDUCTOR 27UH L416 417 L92 0443 05 FERRITE CHIP L418 L41 3375 06 SMALL FIXED INDUCTOR L419 L41 1085 06 SMALL FIXED INDUCTOR L420 L41 1585 06 SMALL FIXED INDUCTOR L421 L41 1085 06 SMALL FIXED INDUCTOR L422 L40 5675 92 SMALL FIXED INDUCTOR 56NH L423 L92 0443 05 FERRITE CHIP L501 502 L41 6875 08 SMALL FIXED INDUCTOR L503 504 L41 2775 06 SMALL FIXED INDUCTOR L505 L34 4645 05 AIR CORE COIL L506 L34 4693 05 AIR CORE COIL L507 L34 4732 05 AIR CORE COIL L508 L34 4669 05 AIR CORE COIL L509 L34 4667 05 AIR CORE COIL L601 L34 4737 05 AIR CORE COIL L602 604 L34 4736 05 AIR CORE COIL L605 L34 4667 05 AIR CORE COIL X86 L78 1409 05 RESONATOR 8 00MHZ X401 L77 1944 05 TCXO 16 8MHZ XF351 L71 0620 05 MCF 49 95MHZ R1 R92 1252 05 CHIP R 0 OHM J 1 16W R2 3 RK73GB1J101J CHIP R 100 J 1 16W R4 8 RK73GB1J102J CHIP R 1 0K J 1 16W R31 RK73GB1J472J CHIP R 4 7K J 1 16W R32 R92 1215 05 CHIP R 470 J 1 2W R33 RK73GB1J473J CHIP R 47K J 1 16W R34 RK73GB1J472J CHIP R 4 7K J 1 16W R35 RK73GB1J473J CHIP R 47K J 1 16W R36 RK73GB1J152J CHIP R 1 5K J 1 16W
30. 1 Layer 2 Layer 3 Layer 4 TX RX UNIT X57 685X XX Component side view J72 0906 09 0 10 TM 271A K 0 21 TM 271A M2 0 22 TM 271A M3 0 23 TM 271A M4 2 71 TM 271E E PC BOARD TM 271A 271E Ref No Address IC33 12B IC161 1N IC201 10P IC202 11P IC203 12P IC204 10I IC205 11I IC252 10B IC401 12J IC501 8J Q35 13C Q36 12C Q201 11O Q252 12F Q253 12F Q254 11D Q255 10D Q302 13K Q351 12N Q354 9O Q402 12H Q403 13H Q503 6G Q504 5K D3 12E D4 12E D5 11E D6 11E D201 11O D202 10O D251 9E D302 12O D303 12O D401 12J D402 13I D503 8J D602 7P D603 7Q D608 8L J K L M N O P Q R S I H G F E D C B A 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 8 9 10 11 12 13 14 C20 R401 R402 R403 R210 R404 R211 R212 R406 R213 R407 R214 R408 C28 R215 R409 C29 J1 EXT SP R216 R217 R218 R219 R410 R411 IC161 1 12 13 24 R605 R412 R606 R413 R607 R414 R220 R221 R222 R418 R224 R225 R419 R226 J72 0906 09 R227 IC33 O G B C E I R228 R229 R420 R421 R422 C44 R230 C45 R231 R232 R233 R234 C49 R236 R237 C50 C201 C51 C52 C202 C203 C204 C205 C206 C207 C208 C209 R246 R247 R248 C400
31. 22 J 1 16W R510 RK73GB1J152J CHIP R 1 5K J 1 16W R511 RK73FB2A470J CHIP R 47 J 1 10W R512 RK73FB2A100J CHIP R 10 J 1 10W R513 RK73FB2A222J CHIP R 2 2K J 1 10W R514 R92 1217 05 CHIP R 0 OHM R516 R92 0670 05 CHIP R 0 OHM R518 RK73EB2B330J CHIP R 33 J 1 8W R519 RK73GB1J333J CHIP R 33K J 1 16W R520 RK73GB1J183J CHIP R 18K J 1 16W R521 RK73GB1J101J CHIP R 100 J 1 16W R522 RK73EB2B331J CHIP R 330 J 1 8W R523 RK73GB1J393J CHIP R 39K J 1 16W R524 R92 1215 05 CHIP R 470 J 1 2W R525 RK73GB1J563J CHIP R 56K J 1 16W R526 R92 1261 05 CHIP R 150 J 1 2W R527 RK73GB1J224J CHIP R 220K J 1 16W R528 529 RK73GB1J471J CHIP R 470 J 1 16W R530 RK73GB1J102J CHIP R 1 0K J 1 16W R531 RK73GB1J473J CHIP R 47K J 1 16W R532 533 R92 1252 05 CHIP R 0 OHM J 1 16W R601 602 RK73GB1J223J CHIP R 22K J 1 16W R605 RK73GB1J153J CHIP R 15K J 1 16W R606 RK73GB1J221J CHIP R 220 J 1 16W R607 RK73GB1J331J CHIP R 330 J 1 16W R800 R92 1061 05 JUMPER VR601 R12 6427 05 TRIMMING POT 47K 12 D1 6 DA221 DIODE D31 ZSH5MA27 SURGE ABSORBER D32 1812L110PR VARISTOR D61 02DZ18 X Y ZENER DIODE D62 MA2S077 DIODE D201 DAN222 DIODE D202 1SS372 DIODE D251 MA742 DIODE D301 MA742 DIODE D302 303 DAN222 DIODE D351 354 HVC376B VARIABLE CAPACITANCE DIODE D401 MA2S111 DIODE D402 HZU5ALL DIODE D403 406 MA2S304 VARIABLE CAPACITANCE DIODE D4
32. 2SK508NV K52 FET Q407 2SJ347 FET Q408 KRX102U TRANSISTOR Q410 2SC5108 Y TRANSISTOR Q411 2SC4649 N P TRANSISTOR Q440 2SC2412K TRANSISTOR Q501 502 2SC3357 TRANSISTOR Q503 PD55003TR DRIVE FET Q504 2B RD70HVF1 01 FINAL FET TH97 98 NCP18WF104J03 THERMISTOR TH301 NCP18WF104J03 THERMISTOR Ref No Address Parts No Description Desti nation New parts Ref No Address Parts No Description Desti nation New parts TX RX UNIT X57 685X XX TM 271A 271E 17 EXPLODED VIEW Parts with the exploded numbers larger than 700 are not supplied 3 2 1 B A 1 30 31 18 2 3 Dx8 12 13 14 29 Ax2 A Cx12 26 23 13 14 IC252 Q504 25 27 9 8 Cx2 Cx2 6 701 S No label 702 Standard label K 700 Caution label 703 Sticker M3 28 44 43 48 15 42 24 24 Bx2 16 103 101 104 102 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 TM 271A 271E 18 PACKING Parts with the exploded numbers larger than 700 are not supplied 3 2 1 D C 17 Fuse Blade 15A 32V F51 0024 05 E 5 Instruction manual B62 1738 10 K M2 M3 E B62 1739 10 K M2 E B62 1745 10 M3 B62 1746 10 M4 B62 1784 10 E 10 DC cord E30 2111 15 K M2 M3 M4 46 Screw set N99 0395
33. 5dBm W 119 5dBm N 119 0dBm W 104 7dBm N 103 7dBm W 103 9dBm N 103 4dBm W 0 75Vrms N 0 36Vrms W 0 30Vrms N 0 18Vrms W 112 3dBm N 111 5dBm W 92 1dBm N 90 7dBm W 77 6dBm N 74 2dBm W N 5 0mVrms 2 0mVrms for E type W N 0 12Vrms W N 1 40Vrms W N 1 16Vrms W N 1 26Vrms W N 1 04Vrms Receiver Section Transmitter Section TM 271A 271E 41 LEVEL DIAGRAM S To make measurements in the RF section connect the RF Wattmeter 50 D Q504 To make measurements in the AF section connect the AC level meter ANT input 53dBm 1kHz FM 3kHz DEV Wide 1 5kHz DEV Narrow The AF output level is adjusted for a 0 64V 8 by the front panel AF VOL control Q406 vel meter 12dB SINAD TX RX Unit Q410 1 11 Q411 FINAL Amp Q503 2 D409 TX RX Unit S IC402 Audio Frequency Q501 D TX RX Unit VCO CF1 CF2 450kHz Q502 G IC301 D602 G ANT 5 3dBm 10dBm 4 8dBm 12 5dBm 26 5dBm 8 8dBm 60W W 85 0dBm N 84 5dBm W N 0 33Vrms W N 0 32Vrms W N 0 26Vrms W N 0 30Vrms W N 0 31Vrms W N 10mVrms W N 0 50Vrms W N 0 64Vrms 14 J1 IC161 12 Q251 8 9 12 8ohm 10 IC251 7 IC252 IC251 5 1 IC251 IC251 11 1 3 KENWOOD CORPORATION 2967 3 Ishikawa machi Hachioji shi Tokyo 192 8525 Japan KENWOOD U S A CORPORATION P O B
34. C 100PF J C504 507 CK73GB1H102K CHIP C 1000PF K C509 CC73GCH1H150J CHIP C 15PF J C510 CC73GCH1H080B CHIP C 8 0PF B C511 514 CK73GB1H102K CHIP C 1000PF K C515 CC73GCH1H270J CHIP C 27PF J C516 CK73GB1H821K CHIP C 820PF K C517 CC73GCH1H030B CHIP C 3 0PF B C518 CC73GCH1H330J CHIP C 33PF J C519 CC73GCH1H820J CHIP C 82PF J C522 CK73FB1H102K CHIP C 1000PF K C525 CK73GB1H102K CHIP C 1000PF K C526 CK73GB1H681K CHIP C 680PF K C527 CK73GB1H102K CHIP C 1000PF K C528 CK73GB1H221K CHIP C 220PF K C529 CK73FB1H102K CHIP C 1000PF K C530 CK73FB1C474K CHIP C 0 47UF K C531 C92 0719 05 CHIP TAN 47UF 25WV C533 C93 0572 05 CHIP C 100PF J C536 CK73FB1H102K CHIP C 1000PF K C541 542 CM73F2H120J CHIP C 12PF J TM 271A 271E 13 K M2 M3 M4 TM 271A E TM 271E PARTS LIST Ref No Address Parts No Description Desti nation New parts Ref No Address Parts No Description Desti nation New parts TX RX UNIT X57 685X XX C543 544 CM73F2H150J CHIP C 15PF J C545 C93 0603 05 CHIP C 1000PF K C546 CK73FB1C474K CHIP C 0 47UF K C549 CM73F2H221J CHIP C 220PF J C550 CM73F2H680J CHIP C 68PF J C552 C93 0564 05 CHIP C 22PF J C553 C93 0553 05 CHIP C 3 0PF C C554 C93 0603 05 CHIP C 1000PF K C555 C93 0555 05 CHIP C 5 0PF C C556 C93 0603 05 CHIP C 1000PF K C557 558 CK73GB1H103K CHIP C 0 010UF K C559 CK73GB1C104K CHIP C
35. C426 30p L409 27u L408 33n C427 8p L410 27u R423 220 C429 1p R429 270 L411 270n C434 150p L413 47n C435 10p L412 270n L414 27u C439 10p R424 100 L415 27u C440 11p L401 L418 33n D407 1SV278 IC202 BA10358FV 1 2 3 4 5 6 7 8 VCC SPLATTER FILTER OR GATE W NI EVOL1 5C RX VCO TX VCO CV VOTAGE DROPPED CHARGE PUMP MIC AMP IDC TCXO IDC AGC BUFFER AMP CK CPU54 DT CPU53 DT CPU53 HPF TX RX UNIT X57 685X XX W NO EVOL2 DI PLLE CPU3 FROO EVOL23 UL CPU21 CK CPU54 PLLE CPU3 8CL 8CL LIPPLE FILTER DIGITAL POTENTIOMETER RX VCO MODI EVOL9 TX VCO KDC Q402 403 D405 406 BEAT SHIFT BUFFER AMP 8C D403 404 CV MIC AMP SPLATTER FILTER MOD MODULATION 8C 1 2Vcc AGC MIC MUTE T R SW PLL IC D407 T R SW 16 8MHz BEAT SHIFT MOD LIPPLE FILTER RF AMP MOD SUM AMP PLL SYNTHESIZER SQC PKS PR1 PR9 PKD SINGLE ANALOG SW SINGLE ANALOG SW MOD BUFFA 1 2Vcc DC AMP Q201 SURGE ABSORPTION D5 6 RIPPLE FILTER 1 2 3 4 5 6 7 8 9 10 CLK NC3 DATA LE FC NC4 FOUT P NC5 R OSCIN NC1 OSCOUT VP VCC DO GND LD NC2 FIN 2SC4649 N P Q404 2SK508NV K52 Q406 2SJ347 Q407 2SK5
36. C55 R435 C56 R436 R437 R438 R439 R440 R441 C61 R442 R443 R444 R251 C66 R252 R253 R254 R255 R256 R257 R258 R259 C606 IC66 1 4 5 8 C607 C418 R260 TC401 R261 R262 TC402 R263 R264 C610 R265 C611 R266 C421 C616 C617 C426 C427 C428 C429 Q31 E B C Q32 C87 Q33 Q34 C88 C89 C430 C431 C432 C434 C90 C435 C436 C437 C438 C439 R281 C440 C441 C444 C251 C252 C253 C448 C254 C255 C449 C256 C257 C258 C259 D1 D2 C450 C451 C452 C453 C260 C454 C261 C455 C262 C456 C263 C457 C264 C458 C265 Q61 C459 Q301 C266 C460 C461 L101 C462 D403 C463 C464 D404 C465 Q501 B C E D405 C466 Q502 B C E D406 C467 D407 D408 C468 D409 L301 C279 C471 D605 D606 D607 C280 C474 C282 C283 L501 L502 Q86 G D S G D S Q87 IC402 Q352 Q353 S D G2 G1 R102 R103 R104 R109 R301 R110 R111 L351 BPF L352 R308 R114 L354 L355 R309 L356 L357 R501 IC251 1 7 8 14 R502 R503 R504 R310 R505 R506 R507 R509 R123 R124 R126 R127 R510 D31 R511 D32 R512 R513 R514 R325 R522 C101 C102
37. C614 3p NO NO NO 0 0 R119 0 NO 0 0 0 NO R120 NO NO 0 R121 0 NO NO NO 10k 18k R204 18k 18k 18k 1M 750k 750k 750k 750k R207 R55 0 7 30V 7 90V 7 10V 4 96V 4 94V 4 96V 5 02V 7 90V 4 80V BRIGHTNESS MAX 0V BRIGHTNESS OFF Note The components marked with a dot are parts of layer 1 t t t C422 470p C33 1000p C559 0 1u 35 C408 22p R427 100k R305 1 8k C461 1000p C377 1000p L603 5T C218 10u6 3 C43 22u10 R118 0 C444 470p L601 6T C527 1000p R422 10k C438 0 5p R304 4 7k C511 1000p C437 470p C212 1200p R161 1 2k C453 220p R322 100 B 5M C164 10u6 3 R259 12k R301 4 7k C617 1000p IC33 NJM78L05UA 2 COM 3 IN 1 OUT 2 COM 3 IN 1 OUT 2SC3357 Q502 R371 39k C88 4p R252 470k L504 27n 2SA1641 S T Q31 R261 120k C263 0 033u C55 0 1u R36 1 5k C232 1000p 5C C514 1000p R200 680 R103 1k R258 2 7k L421 100n R227 22k C29 470p C301 4 7u6 3 C376 1000p R527 220k C502 1000p R350 27k C220 4 7u6 3 R353 100k BSB C163 1000p C603 1000p C441 0 5p R324 0 C458 220p C257 0 039u R41 330k
38. R276 RK73GB1J473J CHIP R 47K J 1 16W R277 RK73GB1J683J CHIP R 68K J 1 16W R278 RK73GB1J123J CHIP R 12K J 1 16W R279 RK73GB1J472J CHIP R 4 7K J 1 16W R280 RK73GB1J391J CHIP R 390 J 1 16W R281 R92 0670 05 CHIP R 0 OHM R301 302 RK73GB1J472J CHIP R 4 7K J 1 16W R303 RK73GB1J223J CHIP R 22K J 1 16W R304 RK73GB1J472J CHIP R 4 7K J 1 16W R305 RK73GB1J182J CHIP R 1 8K J 1 16W R306 RK73GB1J274J CHIP R 270K J 1 16W R308 RK73GB1J334J CHIP R 330K J 1 16W R309 RK73GB1J332J CHIP R 3 3K J 1 16W R310 RK73GB1J102J CHIP R 1 0K J 1 16W R311 RK73GB1J333J CHIP R 33K J 1 16W R312 RK73GB1J473J CHIP R 47K J 1 16W R313 RK73GB1J104J CHIP R 100K J 1 16W R314 RK73GB1J222J CHIP R 2 2K J 1 16W R315 RK73GB1J183J CHIP R 18K J 1 16W R316 RK73GB1J223J CHIP R 22K J 1 16W R317 320 RK73GB1J103J CHIP R 10K J 1 16W R321 RK73GB1J223J CHIP R 22K J 1 16W R322 RK73GB1J101J CHIP R 100 J 1 16W R323 RK73GB1J124J CHIP R 120K J 1 16W R324 R92 1252 05 CHIP R 0 OHM J 1 16W R325 RK73GB1J333J CHIP R 33K J 1 16W R349 RK73GB1J473J CHIP R 47K J 1 16W R350 RK73GB1J273J CHIP R 27K J 1 16W R351 RK73GB1J471J CHIP R 470 J 1 16W R352 RK73GB1J101J CHIP R 100 J 1 16W R353 RK73GB1J104J CHIP R 100K J 1 16W R354 RK73GB1J331J CHIP R 330 J 1 16W R355 RK73GB1J471J CHIP R 470 J 1 16W R356 RK73GB1J102J CHIP R 1 0K J 1 16W R358 RK73G
39. R314 2 2k C516 820p L352 560n C326 0 01u C509 15p D501 1SS355 C379 1000p R151 10k C518 33p R513 2 2k C466 100p C313 15u6 3 C66 1000p L503 27n 70 C323 270p R512 10 8R C510 8p R364 0 R250 12k R505 2 2k 8R C267 0 47u C464 1000p 5M 5M C360 1000p C357 0 01u R152 4 7k D302 DAN222 C462 10p R373 47k L422 56n C316 0 1u C250 0 1u C375 1000p C83 0 1u C468 220p C315 0 1u L502 68n C380 100p L419 100n R110 47k R443 2 2k R441 100 8R C457 1000p C501 1000p R352 100 R362 470k C506 1000p R316 22k C82 1000p C362 1000p R354 330 R249 15k C503 100p C517 3p C370 1000p R318 10k R501 1k C359 8p R439 47k R365 100k C152 3900p R368 100k R506 10k L351 820n R323 120k R507 10 2SC4649 N P Q411 2SC3357 Q501 C102 0 1u R302 4 7k R320 10k R269 39k C317 0 1u R375 100k C353 0 01u R440 100 17 5M C318 0 1u TONE DTMF PLLE NC NC GND CNVSS EVLLD BSHIFT RESET XOUT VSS XIN VCC GND NC POWER INT NC TX RX UL NC NC EEPSDT EEPCK 26 27 28 29 30 31 32 33 34 35 36 37 38 3
40. T 0 82V N 5V W 0V T 1 23V R 2 46V R 4 98V R 1 8mV BS OFF 5V BS ON T 7 55V R 4 98V R 7 99V R 4 92V T 3 9mV R 13 66V T 12 94V R 7 04V R 7 42V R 4 90V R 0 74V T 0 62V R 4 31V R 3 37V R 6 11V R 6 17V R 4 84V T 5 73V 4 98V R 7 9V R 0 75V R 1 15V R 0 71V R 0 56V R 3 37V R 4 7mV SQ OFF 4 97V SQ ON R 2 48V R 1 44V R 7 7V R 6 34V R 6 64V R 4 98V N 0V W 5V T 1 26V R 1 74V T 6 8V R 3 3V T 0 88V 4 97V R 4 98V R 6 96V T 6 8V T 7 82V R 0 97V R 7 9V R 4 96V T 0 76V T 7 84V R 1 23V R 7 95V R 2 8mV R 0 1mV R 0 76V R 4 05V R 7 98V R 5V R 7 01V R 2 7V 7 30V 7 90V 7 10V 4 96V 4 94V 4 96V 5 02V R 7 84V T 5 61V T 2 5V T 1 46V T 7 85V R 0 87V T 4 97V R 2 88V R 5 86V R 3 16V 7 90V T 7 84V 4 80V BRIGHTNESS MAX 0V BRIGHTNESS OFF TM 271A 271E 38 Q440 2SC2412K DT P1M IC202 BA10358FV SB D201 DAN222 D202 1SS372 KI1 IC203 BA10324 3 4 IC203 BA10324AFV 1 4 D A CONV MIC KEY M PLLE TCXOMOD AGC DET TX RX UNIT X57 685X XX CK LOOP FILTER KS1 8C ELV BUF MIC MUTE CE 8CL IC201 NJM2100V PLL IC 8RC CK RF SBC SUM SW 5C CM MIC KEY2 DI V MIC 8C LIPPLE FILTER D2 4 B30 2205 05 KEY BACK LIGHT ENCA SW BSH KS2 RXD HOOK RXD
41. circuit in the transmitter generates the necessary frequencies Figure 1 shows the frequencies CIRCUIT DESCRIPTION Receiver System The receiver is double conversion superheterodyne The frequency configuration is shown in Figure 1 Front end RF Amplifier An incoming signal from the antenna is applied to an RF amplifier Q353 after passing through a transmit receive switch circuit D603 D605 are off and a band pass filter L357 L356 and varactor diodes D353 D354 After the signal is amplified Q353 the signal is filtered through a band pass filter L354 L355 and varactor diodes D351 D352 to eliminate unwanted signals before it is passed to the first mixer The voltage of these diodes are controlled by tracking the CPU IC101 center frequency of the band pass filter See Fig 2 First Mixer The signal from the RF amplifier is heterodyned with the first local oscillator signal from the PLL frequency synthesizer circuit at the first mixer Q352 to create a 49 95MHz first intermediate frequency 1st IF signal The first IF signal is then fed through one pair of monolithic crystal filter MCF XF351 to further remove spurious signals ANT SW RF AMP 1st MIX AF PA TCXO MIC AMP X3 multiply RF AMP POWER AMP CF 450kHz MCF 49 95MHz IF SYSTEM PLL VCO 16 8MHz 50 4MHz ANT RX TX SP MIC 1 2 Fig 1 Frequency configuration IF Amplifier The first IF sig
42. control 81 NC I 82 SBC O Battery switch 83 85 NC I 86 CM I O MIC key check 87 I For AMR DTMF keypad MIC 88 I For AMR DTMF keypad MIC 89 VOL I Volume encoder 90 TEMP2 I Temperature 2 91 TEMP1 I Temperature 1 92 RSSI I RSSI input 93 SQIN I Squelch input 94 AVSS GND 95 DTMF IN I CTCSS DCS Clone 1050Hz input 96 VREF 5V 97 AVCC 5V 98 100 NC I Microprocessor 30622MAA B85GP TX RX Unit IC101 TM 271A 271E 9 Display Unit X54 3450 10 Ref No Parts name Description IC3 IC LCD controller Q6 Transistor DC switch Q9 Transistor LCD backlit switch Q10 Transistor Key backlit switch Q12 Transistor Brightness function switch D2 4 LED Key backlit D19 30 LED LCD backlit D31 Diode Reverse connection protection TX RX Unit X57 685X XX Ref No Parts name Description IC31 IC Voltage regulator 8C IC32 IC Voltage regulator 5C IC33 IC Voltage regulator 5M IC34 IC Voltage detector reset IC35 IC Voltage detector int IC66 IC EEPROM IC101 IC CPU IC161 IC Digital potentiometer IC201 IC MIC amplifier IDC IC202 IC MIC amplifier Splatter filter IC203 IC Buffer amplifier SUM amplifier DC amplifier 1 2 Vcc IC204 205 IC Single analog switch IC251 IC Audio filter IC252 IC Audio amplifier IC301 IC FM demodulation IC401 IC PLL synthesizer IC40
43. 0 C451 C452 C453 C260 C454 C261 C455 C262 C456 C263 C457 C264 C458 C265 C459 Q301 C266 C460 C461 C462 C463 C464 C465 Q501 B C E C466 C467 D408 C468 D409 L301 C471 D605 D606 D607 C474 L501 IC402 Q352 Q353 S D G2 G1 R301 L351 BPF L352 R308 L354 L355 R309 L356 L357 R501 IC251 1 7 8 14 R502 R503 R504 R310 R505 R506 R507 R509 R510 R325 R526 C301 C302 C306 C307 C308 C309 C501 C502 C503 C504 C505 C506 C507 C509 R356 R358 R359 C511 R360 R361 XF351 C326 R362 R363 R364 R365 R366 R367 R368 R369 R370 R371 R372 R373 R374 R375 R376 C357 C358 C359 C360 C361 D301 C362 C556 C363 C557 C544 C543 C364 C558 C366 C367 C368 Q404 C369 Q405 G S D Q406 G S D Q407 G S D Q408 1 2 3 5 D501 D50 C370 C371 C372 C373 Q410 C374 Q411 C375 C376 C377 C378 C379 L407 L408 C380 C381 IC301 1 10 11 20 L409 C382 C383 C384 C385 L601 C386 L602 C387 L603 C388 L410 L604 L605 L4 L414 L415 L416 L417 L418 C390 L419 C391 L420 L421 L422 L423 Q440 Q251 D351 D352 D353
44. 01 22k R321 22k D202 1SS372 C351 33p C228 10u6 3 R413 10k R502 270 R82 0 C411 0 1u R314 2 2k C516 820p R279 4 7k C204 2 2u10 87 L352 560n R220 15k R310 1k C326 0 01u C203 C418 1000p C425 0 1u35 R263 91k C509 15p BSB D501 1SS355 L507 1T C379 1000p R221 15k R151 10k R379 100k 8C R407 1 5k C89 4p C253 0 22u C262 1000p R232 9 1k R532 0 C518 33p C423 0 047u35 D607 MA742 R518 33 R513 2 2k C217 10u6 3 R35 47k C466 100p C430 4 5p C313 15u6 3 C66 1000p Q34 KRC102S C40 0 1u L503 27n 70 C323 270p R274 15k R62 0 C273 1u C611 2p R512 10 C56 1000p 8R R417 220k L417 C510 8p R525 56k R364 0 R401 1k R250 12k R505 2 2k R529 470 8R C406 1000p R253 0 C267 0 47u C464 1000p R231 120k 5M 5M C360 1000p C357 0 01u 8T R152 4 7k C558 0 01u D302 DAN222 R433 4 7k R31 4 7k C549 220p C462 10p R373 47k R40 390k L422 56n 8C Q255 KRC102S C214 150p R528 470 C35 1000p R411 5 6k C525 1000p C316 0 1u R402 1k D31 ZSH5MA27 R213 330k R214 68k C250 0 1u R272 3 9k R414
45. 01 2193 01 CABINET 2 3B A10 4048 21 CHASSIS 3 3A A62 1088 03 PANEL ASSY 5 1D B62 1738 10 INSTRUCTION MANUAL K M2 M3 5 1D B62 1738 10 INSTRUCTION MANUAL E 5 1D B62 1739 10 INSTRUCTION MANUAL K M2 E 5 1D B62 1745 10 INSTRUCTION MANUAL M3 5 1D B62 1746 10 INSTRUCTION MANUAL M4 5 1D B62 1784 10 INSTRUCTION MANUAL E 6 3B B72 2171 04 MODEL NAME PLATE K 6 3B B72 2172 04 MODEL NAME PLATE M2 6 3B B72 2173 04 MODEL NAME PLATE M3 6 3B B72 2174 04 MODEL NAME PLATE M4 6 3B B72 2175 04 MODEL NAME PLATE E 8 3B E04 0167 05 RF COAXIAL PECEPTACLE M K M2 M3 8 3B E04 0167 05 RF COAXIAL PECEPTACLE M M4 9 3B E04 0170 05 RF COAXIAL RECEPTACLE N E 10 3C E30 2111 15 DC CORD ACCESSORY K M2 M3 10 3C E30 2111 15 DC CORD ACCESSORY M4 11 3C E30 3452 05 DC CORD ACCESSORY E 12 2B E30 7501 05 TNC CABLE E 13 2B E30 7512 05 DC CORD RADIO K M2 M3 13 2B E30 7512 05 DC CORD RADIO M4 14 2B E30 7513 05 DC CORD RADIO E 15 3A E37 1082 05 SPEAKER WIRE 16 2A E37 1097 05 FLAT CABLE 17 3C F51 0024 05 FUSE BLADE 15A 32V E 18 2B F10 2449 01 SHIELDING COVER 20 3C F51 0017 05 FUSE 6 30 15A K M2 M3 20 3C F51 0017 05 FUSE 6 30 15A M4 23 2B G02 0894 04 EARTH SPRING FINAL FET 24 2A G10 1324 04 FIBROUS SHEET DISPLAY UNIT 25 3B G1
46. 05 8C R349 47k R504 270 C371 2p C414 0 1u R111 1k C251 4 7u6 3 R530 1k R102 47k D301 MA742 Q32 KRC102S R511 47 C531 47u25 C38 1000p D251 MA742 74 C505 1000p R437 1k C545 1000p R325 33k R533 0 D201 DAN222 5C C452 470p D606 MA742 5M L605 9 5T C513 1000p R503 18 C358 1000p L101 C522 1000p R86 0 C610 0 5p C230 0 1u C308 1000p R436 120k C322 56p C608 27p 71 R277 68k R164 1k C460 18p C271 1200p CN5 C512 1000p C402 100p 5C C616 1000p C208 0 01u L301 L34 4554 05 C207 IC201 NJM2100V 1 2 3 4 5 6 7 8 V C42 0 01u 69 R430 220 35 C529 1000p C275 1u TC402 10p C455 3p C61 1000p D32 1812L110PR 8C L602 5T 8C R87 1k R254 2 7k 89 R434 0 C574 1000p C554 1000p R312 47k C53 1000p C560 1000p C613 27p C576 220p C265 0 1u R410 8 2k R256 5 6k R81 47k 5C C51 10u6 3 R123 0 D503 02DZ5 1 Y C416 1000p C378 1000p C280 47u16 R602 22k R313 100k D502 DA221 17 5C R217 220k C389 1000p C302 1000p R70 47k L506 9 5T 71 R104 1k L420 150n C413 0 01u C279 4 7u16 R6
47. 06 220 C307 0 022u C45 22u10 C530 0 47u C281 1000p R526 150 R37 0 TH301 100k 8R 5C C310 0 33u R278 12k C52 1000p 8T L604 5T R34 4 7k R521 100 C44 22u10 R271 3 3k 8T C34 330u 25 L509 9 5T R39 470k Q254 DTC363EU R257 1M R255 5 6k C278 0 1u KTA1664 Y Q35 68 C54 0 1u L508 2 5T D608 1SS355 D602 MA4PH633 R306 270k C606 0 5p R265 5 6k R308 330k C254 0 22u SB 73 R275 15k R33 47k R276 47k C36 1000p C306 1000p R273 12k C258 0 01u C536 1000p C350 470p C274 0 22u C546 0 47u R800 F501 R520 18k R605 15k C39 0 1u D61 02DZ18 X Y R531 47k C272 1000p R251 47k 70 Q36 KRC102S R519 33k C28 220p B C276 1000p R281 0 C49 0 01u 34 C550 68p C526 680p R266 5 6k C266 1u C277 1000p 2SA1745 6 7 Q33 C557 0 01u R61 470 C615 22p 8C R349 47k C251 4 7u6 3 R530 1k D301 MA742 Q32 KRC102S C531 47u25 C38 1000p D251 MA742 74 C545 1000p R533 0 D606 MA742 L605 9 5T C522 1000p C610 0 5p C308 1000p C608 27p 71 R277 68k C271 1200p CN5 C616 1000p C42 0 01u 69 35 C529 1000p C275
48. 07 1SV278 VARIABLE CAPACITANCE DIODE D408 MA2S111 DIODE D409 DAN235E DIODE D501 1SS355 DIODE D502 DA221 DIODE D503 02DZ5 1 Y ZENER DIODE D602 MA4PH633 DIODE D603 XB15A709 DIODE D605 XB15A709 DIODE D606 607 MA742 DIODE D608 1SS355 DIODE IC31 KIA7808AF ANALOG IC IC32 33 NJM78L05UA BI POLAR IC IC34 BD4732G MOS IC IC35 BD4740G MOS IC IC66 AT24C64A10SI18 ROM IC IC66 CAT24WC64JI ROM IC IC101 30622MAA B85GP MPU IC161 M62363FP MOS IC IC201 NJM2100V MOS IC IC202 BA10358FV MOS IC IC203 BA10324AFV MOS IC IC204 205 BU4S66 MOS IC IC251 BA10324AFV MOS IC IC252 2B LA4600 BI POLAR IC IC301 TK14489V BI POLAR IC IC401 MB15A02 MOS IC IC402 UPB1509GV BI POLAR IC IC501 TA75W01FU MOS IC Q31 2SA1641 S T TRANSISTOR Q32 KRC102S DIGITAL TRANSISTOR Q33 2SA1745 6 7 TRANSISTOR Q34 KRC102S DIGITAL TRANSISTOR Q35 KTA1664 Y TRANSISTOR Q36 KRC102S DIGITAL TRANSISTOR Q61 KRC404RTK DIGITAL TRANSISTOR Q86 87 2SK1830 FET Q201 2SC4919 TRANSISTOR TM 271A 271E 16 PARTS LIST K M2 M3 M4 TM 271A E TM 271E Q251 2SC2412K TRANSISTOR Q252 253 2SK3019 FET Q254 DTC363EU DIGITAL TRANSISTOR Q255 KRC102S DIGITAL TRANSISTOR Q301 302 2SC2412K TRANSISTOR Q351 2SC5488 TRANSISTOR Q352 353 3SK318 FET Q354 2SK1830 FET Q402 2SA1832 GR TRANSISTOR Q403 2SC4738 GR TRANSISTOR Q404 2SC4649 N P TRANSISTOR Q405 406
49. 08NV K52 Q405 2SC5108 Y Q410 Q408 KRX102U 2SC2412K Q440 CONT VDD 2SK1830 Q87 X86 8 00MHz L78 1409 05 2SK1830 Q86 8 9 10 11 12 13 14 1 2 3 4 5 6 7 2VOLI 2VOLO BLO BLI 1VOLI 1VOLO DO VDFref RESET GND FRQI FRQO PC TVO PC TVI VDD LD CLK DAT MODI MODO W NO W NI BRII BRIO QT DQT CPU1 1 2Vcc EVLLD CPU8 UL CPU21 PLLE CPU3 M1MT CPU76 XOUT CPU11 XIN CPU13 TX DTMF BSHIFT P9MT CPU75 MICMT CPU77 TX RX CPU20 W NO EVOL2 W NI EVOL1 MIC VOLO EVOL11 VOLI EVOL12 DT CPU53 CK CPU54 BRI PLLE CPU3 MODO EVOL10 PC TV UL CPU21 PC TVO EVOL3 EVLLD CPU8 P9MT CPU75 MICMT CPU77 MOD TX RX CPU20 T 4 16V T 0 82V R 1 8mV BS OFF 5V BS ON R 4 92V T 3 9mV R 7 04V R 4 90V R 0 74V T 0 62V R 3 37V R 6 11V R 6 17V R 7 9V R 0 71V R 2 48V R 7 7V 4 97V R 4 98V R 6 96V T 6 8V R 0 97V R 4 96V R 2 8mV R 0 1mV R 0 76V R 4 05V R 7 98V R 7 01V X57 685 1 3 SCHEMATIC DIAGRAM TM 271A 271E 35 J I H G F X57 685 2 3 35 C461 1000p C377 1000p R118 0 C511 1000p R322 100 R301 4 7k 2SC3357 Q502 R371 39k L504 27n C514 1000p R103 1k L421 100n C301 4 7u6 3 C376 1000p C502 1000p R353 100k R324 0
50. 1 With the transceiver power OFF press F Power All indicators light momentarily followed by the full reset confirmation message VFO Reset This resets the transceiver 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 than F to cancel 3 Press F again to reset the transceiver WAIT appears momentarily Full Reset Method 2 1 Press F MENU and turn the Tuning control to select Menu No 99 RESET 2 Press MENU and turn the Tuning control to select FULL 3 Press MENU SURE appears Press any key other than MENU to cancel 4 Press MENU to reset the transceiver WAIT appears momentarily 2 Press VFO SURE appears Press any key other than VFO to cancel 3 Press VFO again to reset the transceiver WAIT appears momentarily VFO Reset Method 2 1 Press F MENU and turn the Tuning control to select Menu No 99 RESET 2 Press MENU and turn the Tuning control to select VFO 3 Press MENU SURE
51. 1 4127 14 RUBBER SHEET CHASSIS 26 2B G11 4240 04 RUBBER SHEET DRIVE FET 27 3B G13 1468 04 CUSHION CHASSIS K M2 M3 27 3B G13 1468 04 CUSHION CHASSIS M4 28 3A G53 1525 03 PACKING PANEL 29 2B G53 1542 03 PACKING PHONE JACK 30 1B G53 1544 01 PACKING SHIELDING COVER 31 1A G53 1548 02 GASKET 33 2C 1D H12 3112 05 PACKING FIXTURE 34 3D H13 1190 02 CARTON BOARD 36 1D H25 2341 04 PROTECTION BAG 37 2D H52 1995 12 ITEM CARTON CASE K M2 37 2D H52 2027 02 ITEM CARTON CASE M3 37 2D H52 2028 02 ITEM CARTON CASE M4 37 2D H52 2029 12 ITEM CARTON CASE E 39 3C J19 1584 05 MIC HOLDER ACCESSORY 40 3D J29 0662 03 BRACKET ACCESSORY 42 3A K29 9291 01 KEY TOP 43 3A K29 9292 03 KNOB VOLUME 44 3A K29 9293 03 KNOB ENCODER A 2B N67 2608 46 PAN HEAD SEMS SCREW B 2A N80 2010 45 PAN HEAD TAPTITE SCREW C 2B 3B N87 2606 46 BRAZIER HEAD TAPTITE SCREW D 1B 2B N87 2614 46 BRAZIER HEAD TAPTITE SCREW 46 3D N99 0395 05 SCREW SET ACCESSORY 48 3A T07 0739 05 SPEAKER 49 2C T91 0624 05 MICROPHONE ACCESSORY M2 M4 50 2C T91 0641 05 MICROPHONE ACCESSORY K M3 E 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 CK73G
52. 104K CHIP C 0 10UF K C128 CK73GB1H102K CHIP C 1000PF K C151 CK73GB1H182K CHIP C 1800PF K C152 CK73GB1H392K CHIP C 3900PF K C161 CK73GB1H102K CHIP C 1000PF K C162 C92 0507 05 CHIP TAN 4 7UF 6 3WV C163 CK73GB1H102K CHIP C 1000PF K C164 C92 0560 05 CHIP TAN 10UF 6 3WV C165 CK73GB1A105K CHIP C 1 0UF K C201 CK73GB1C104K CHIP C 0 10UF K C202 CK73GB1H102K CHIP C 1000PF K C203 CK73GB1C273K CHIP C 0 027UF K K M2 M3 C203 CK73GB1C273K CHIP C 0 027UF K M4 C203 CK73GB1C473K CHIP C 0 047UF K E C204 C92 0514 05 CHIP TAN 2 2UF 10WV C205 CK73GB1C104K CHIP C 0 10UF K C206 CK73GB1H102K CHIP C 1000PF K K M2 M3 C206 CK73GB1H102K CHIP C 1000PF K M4 C206 CK73GB1H681K CHIP C 680PF K E C207 CK73GB1C223K CHIP C 0 022UF K K M2 M3 C207 CK73GB1C223K CHIP C 0 022UF K M4 C207 CK73GB1C393K CHIP C 0 039UF K E C208 CK73GB1H103K CHIP C 0 010UF K C209 CC73GCH1H680J CHIP C 68PF J C210 CK73GB1C104K CHIP C 0 10UF K C211 CK73GB1H821K CHIP C 820PF K C212 CK73GB1H122K CHIP C 1200PF K C213 CK73GB1H332K CHIP C 3300PF K C214 CC73GCH1H151J CHIP C 150PF J C215 CK73GB1C104K CHIP C 0 10UF K C216 CC73GCH1H390J CHIP C 39PF J C217 218 C92 0560 05 CHIP TAN 10UF 6 3WV C220 C92 0507 05 CHIP TAN 4 7UF 6 3WV C222 CK73GB1C104K CHIP C 0 10UF K C225 C92 0004 05 CHIP TAN 1 0UF 16WV C226 CK73GB1H472K CHIP C 4700PF K C227 CK73GB1E103K CH
53. 13O IC34 13M IC35 13L IC66 11L IC101 11N IC251 12B IC301 12E IC402 13G 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 12I Q406 13J Q407 12I Q408 11H Q410 12I Q411 12G Q440 12H Q501 10I Q502 10K D1 12O D2 11O D31 4N D32 5Q D61 4P D62 4P D301 13F D351 10D D352 10C D353 9B D354 8B D403 11K D404 11J D405 13K D406 12K D407 12K D408 12H D409 10G D501 10I D502 10J D605 7B D606 5B D607 4B TX RX UNIT X57 685X XX Foil side view J72 0906 09 0 10 TM 271A K 0 21 TM 271A M2 0 22 TM 271A M3 0 23 TM 271A M4 2 71 TM 271E E TX RX UNIT X57 685X XX Foil side view J72 0906 09 0 10 TM 271A K 0 21 TM 271A M2 0 22 TM 271A M3 0 23 TM 271A M4 2 71 TM 271E E Component side Foil side Layer 1 Layer 2 Layer 3 Layer 4 TM 271A 271E SCHEMATIC DIAGRAM 34 7 6 5 4 3 2 1 A B C D E t t C422 470p C408 22p R427 100k C218 10u6 3 C444 470p R422 10k C438 0 5p C437 470p C212 1200p R161 1 2k C453 220p C164 10u6 3 C88 4p C232 1000p R200 680 R227 22k C220 4 7u6 3 C163 1000p C441 0 5p TC401 10p R416 470 R229 680k C215 0 1u C432 0 3p R166 1k 8C C213 3300p 5C C231 1000p C233 4 7u6 3 L404 R
54. 144 148MHz 144 146MHz
55. 15A02 11 12 13 14 15 16 17 18 19 20 R219 180k C210 0 1u C454 6p C417 1000p R228 10k L403 10u R226 100k D408 MA2S111 D402 HZU5ALL C401 100p C206 R215 68k C201 0 1u C90 3p C226 4700p C431 5p C202 1000p C211 820p C404 15u6 3 C162 4 7u6 3 R216 270k R432 1k R408 10 R204 C449 470p R418 1k 8C R431 100k R206 100 C225 1u16 R404 10k R209 240k R420 1k R225 150k C412 10u6 3 R210 18k C442 10u6 3 R428 47k CN2 1 2 3 4 5 6 7 D5 DA221 C16 470p D6 DA221 C19 470p C17 470p C18 470p C20 470p IC205 BU4S66 1 I O 2 O I 3 VSS 4 5 R237 0 R236 10k C235 1u PR9 PR1 PKS SQC 5C R234 0 IC204 BU4S66 1 I O 2 O I 3 VSS 4 CONT 5 VDD C222 0 1u R224 560 PKD PKD 5C R93 6 8k R94 10k TH98 100k C97 1000p TH97 100k C98 1000p C216 39p IC161 M62363FP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 R222 10k IC203 BA10324AFV VCC VEE C209 68p C165 1u X401 L77 1944 05 R406 10k C475 1000p C476 1000p C473 1000p C400 0 1u L406 270n L407 270n
56. 162 1 5k R419 2 7k R218 82k C87 3p R208 1 5k C450 22u10 R211 82k R426 47k R233 6 8k C227 0 01u R230 220k R421 1 5k 5C R207 D404 MA2S304 D403 MA2S304 C428 470p 5M C421 470p C410 10u6 3 C448 470p R203 100k R412 10k D405 MA2S304 2SC4919 Q201 C205 0 1u 2SC4738 GR Q403 2SA1832 GR Q402 D406 MA2S304 R212 82k L416 C403 100p L201 R205 820 R409 100k D401 MA2S111 C409 0 1u C436 0 75p R165 1k R425 47k R435 100 R415 0 C161 1000p L405 C414 0 1u D201 DAN222 5C C452 470p 5M R86 0 C230 0 1u R436 120k R164 1k C402 100p C208 0 01u C207 IC201 NJM2100V 1 2 3 4 5 6 7 8 V R430 220 TC402 10p C455 3p R87 1k R434 0 R410 8 2k C416 1000p R217 220k C413 0 01u D202 1SS372 C228 10u6 3 R413 10k C411 0 1u C204 2 2u10 R220 15k C203 C418 1000p C425 0 1u35 R221 15k 8C R407 1 5k C89 4p R232 9 1k C423 0 047u35 C217 10u6 3 C430 4 5p R417 220k L417 R401 1k C406 1000p R231 120k R433 4 7k 8C C214 150p R411 5 6k R402 1k R213 330k R214 68k R414 470 R403 1k C451 470p C424 1u16 IC401 MB
57. 2 IC Divider Hetero IC501 IC APC controller Q31 32 Transistor DC switch SB Active when power is on Q33 34 Transistor DC switch 8R Active while RX Q35 36 Transistor DC switch 8T Active while TX Q61 Transistor Over voltage detection Active when PS voltage is more than 18V Q86 87 Transistor Beat shift Active while beat shift is on Q201 Transistor AGC MIC mute Q251 Transistor Buffer amplifier RX audio Q252 253 FET AF mute Active while AFM is H Q254 Digital transistor AF mute Active while SPM is H Q255 Transistor AF mute Active while AMPSW is H Q301 Transistor Noise amplifier SQL amplifier Ref No Parts name Description Q302 Transistor Buffer amplifier 16 8MHz 3rd over tone Q351 Transistor IF amplifier Q352 FET Mixer Q353 FET RF amplifier LNA Q354 Transistor 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 switch Q408 Transistor T R switch Q410 Transistor Buffer amplifier Output of VCO Q411 Transistor RF amplifier Output of VCO Q440 Transistor Lipple filter Q501 502 Transistor RF amplifier Drive stage Q503 FET RF amplifier Drive amplifier Q504 FET RF amplifier Final amplifier D1 Diode Surge absorption CM D2 Diode Surge absorption MIC key D3 Diode Surge absorption RXD D4 Diode Sur
58. 27 R5 R529 R R151 R152 C514 C516 C517 C518 C519 C522 C525 C527 C528 C529 R35 R1 R36 R2 R37 R3 C530 C531 C533 C536 C151 C152 C559 Q402 Q403 C560 L201 D503 L404 R81 R82 IC252 1 10 IC5 5 8 CN1 CN2 CN5 Q252 Q253 D S G D S G Q254 Q255 C10 1 17 18 2 CM MIC KEY CE DO 8C POWER BRI GND MIC ENCA ENCB DI CL 5C VOL RXD PTT ME C13 R200 C15 C16 C17 C18 C19 GND PR9 PR1 PKS SQC PKD 5M CNVSS RESET 1 7 POWER RXD TXD CV RF DC B E 8T PKD GND PR9 PR1 PKS SQC GND 1 10 11 20 30 TM 271A 271E PC BOARD TX RX UNIT X57 685X XX Component side view J72 0906 09 0 10 TM 271A K 0 21 TM 271A M2 0 22 TM 271A M3 0 23 TM 271A M4 2 71 TM 271E E J K L M N O P Q R S 1 2 3 4 5 6 7 8 9 10 11 12 13 14 R210 R404 R211 R212 R406 R213 R407 R214 R408 R215 R409 R216 R217 R218 R219 IC161 1 12 13 24 R605 R606 R607 R220 R221 R222 R224 R225 R226 J72 0906 09 R227 R228 R229 R230 R231 R232 R233 R234 C202 C203 C204 C205 C206 C207 C208 C209 R247 C400 C210 C404 C211 C212 C406 C213 C21
59. 29 RK73GB1J684J CHIP R 680K J 1 16W R230 RK73GB1J224J CHIP R 220K J 1 16W R231 RK73GB1J124J CHIP R 120K J 1 16W R232 RK73GB1J912J CHIP R 9 1K J 1 16W R233 RK73GB1J682J CHIP R 6 8K J 1 16W R234 R92 1252 05 CHIP R 0 OHM J 1 16W R236 RK73GB1J103J CHIP R 10K J 1 16W R237 R92 1252 05 CHIP R 0 OHM J 1 16W R246 RK73GB1J154J CHIP R 150K J 1 16W R247 RK73GB1J124J CHIP R 120K J 1 16W R248 RK73GB1J562J CHIP R 5 6K J 1 16W R249 RK73GB1J153J CHIP R 15K J 1 16W 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 RK73GB1J124J CHIP R 120K J 1 16W R262 RK73GB1J183J CHIP R 18K J 1 16W R263 RK73GH1J913D CHIP R 91K D 1 16W R264 RK73GH1J124D CHIP R 120K D 1 16W R265 RK73GH1J562D CHIP R 5 6K D 1 16W R266 RK73GB1J562J CHIP R 5 6K J 1 16W R268 RK73GB1J102J CHIP R 1 0K J 1 16W R269 RK73GB1J393J CHIP R 39K J 1 16W R271 RK73GB1J332J CHIP R 3 3K J 1 16W R272 RK73GB1J392J CHIP R 3 9K J 1 16W R273 RK73GB1J123J CHIP R 12K J 1 16W R274 275 RK73GB1J153J CHIP R 15K J 1 16W
60. 3 470p C14 470p C10 1000p C15 470p R1 0 D3 DA221 D2 DA221 D4 DA221 D1 DA221 8C 5C 5M 88 R522 330 R523 39k C533 100p L505 15n C542 12p C541 12p C552 22p C553 3p C614 C623 3p C602 12p C605 15p D603 XB15A709 VR601 47k R607 330 PR9 C305 330p C304 330p 1 2 3 4 VCC 5 6 7 VEE 2SC2412K Q251 FB R63 0 D62 MA2S077 1 NC 2 SUB 3 GND 4 VOUT 5 VCC IC34 BD4732G 1 NC 2 SUB 3 GND 4 VOUT 5 VCC J1 F1 FB C282 330u25 C388 7p C390 9p C391 16p 2SK1830 Q354 PD55003TR Q503 C544 15p C543 15p KEC 8TC CURRENT PROTECTION BUFFER AMP MIC AUDIO FILTER SQIN CPU93 B OVER VOLTAGE DETECTION E VOLTAGE REGULATOR 8C REVERSE CONNECTION PROTECTION APC CONTROLLER FINAL AMP D603 605 TEMPERATURE COMPENSATION 1 2Vcc D31 TV 5M LIMITTER PC TV SW KEC PC 8T KEC Q35 36 APC VOLTAGE DETECT VOLTAGE DETECTOR RESET D606 607 ANT SW ANT SW D1 4 VOLTAGE REGULATOR 5M 8TC CPU80 8RC CPU76 D32 DRIVE AMP RX 1 1A 5C DETECTION VOLTAGE DETECTOR INT DC SW SB 8C W NO EVOL2 NOISE AMP SQL AMP VOLTAGE PROTECTION KEC Q33 34 KEC 8C SB OVER VOLTAGE DETECTION VOLTAGE REGULATOR 5C SURGE AB
61. 305 R151 R152 R349 C310 C311 C312 C313 C314 R350 C315 R351 C316 R352 R353 C317 C318 R354 C319 R355 R161 R162 R164 C128 R165 R166 C514 C321 C322 C516 C323 C517 C324 C518 C519 C522 C525 C527 C528 C529 R35 R1 R36 R2 R37 R3 C530 R379 C531 C533 C536 C151 C152 C541 C542 C350 C351 C545 C546 C353 C354 C161 C355 C549 C162 C356 C163 C164 Q201 C165 C550 C552 C553 C554 C555 D302 D303 C559 Q402 Q403 C560 L201 D503 L401 L403 L404 C574 C576 R81 R82 IC252 1 10 C389 IC501 1 4 5 8 CN1 CN2 CN5 TH97 TH98 Q252 Q253 D S G D S G Q254 Q255 C10 1 17 18 2 CM MIC KEY CE DO 8C POWER BRI GND MIC ENCA ENCB DI CL 5C VOL RXD PTT ME C13 R200 C15 C16 C17 R203 C18 R204 C19 R205 R206 R207 R208 R209 GND PR9 PR1 PKS SQC PKD 5M CNVSS RESET 1 7 POWER RXD TXD CV RF DC B E TEMP1 PC 8T BPF AFV 8T TEMP2 PKD GND PR9 PR1 PKS SQC GND 1 10 11 20 30 31 TM 271A 271E PC BOARD Component side Foil side Layer 1 Layer 2 Layer 3 Layer 4 TX RX UNIT X57 685X X
62. 36 37 38 39 40 41 42 43 44 45 46 47 48 49 NC 50 KI1 51 KI2 52 KI3 53 NC 54 NC 55 NC 56 VDD 57 VDD1 58 VDD2 59 VSS 60 OSC 61 DO to cpu 62 CE 63 CL 64 DI from cpu C34 4700p D29 B30 2205 05 D20 B30 2205 05 R53 0 D27 B30 2205 05 R22 10k VR1 R31 0646 05 R50 56 C30 0 1u R52 0 D28 B30 2205 05 R8 1k R4 1k R2 100 R3 100 CN1 R7 1k R5 1k R8 1k R6 1k C13 470p C14 470p C10 1000p C15 470p R1 0 D3 DA221 D2 DA221 D4 DA221 D1 DA221 CN2 1 2 3 4 5 6 7 D5 DA221 C16 470p D6 DA221 C19 470p C17 470p C18 470p C20 470p IC205 BU4S66 1 I O 2 O I 3 VSS 4 5 R237 0 R236 10k C235 1u PR9 PR1 PKS SQC TONE DTMF PLLE NC NC GND CNVSS EVLLD BSHIFT RESET XOUT VSS XIN VCC GND NC POWER INT NC TX RX UL NC NC EEPSDT EEPCK 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 P1MT 77 MICMT 78 NC 79 8RC 80 8TC 81 NC 82 SBC 83 NC 84 NC 85 NC 86 CM 87 MICKEY2 88 MICKEY 89 VO
63. 36 SW Q35 SW LD 8RC 8C 8R 8T 8TC PLL lock LD H Fig 7 Unlock circuit Transmitter System Outline The transmitter circuit produces and amplifies the desired frequency directly It FM modulates the carrier signal by means of a varicap diode Power Amplifier Circuit The transmit output signal from the VCO passes through the transmission reception selection diode D409 and ampli fied by Q501 Q502 and Q503 The amplified signal goes to the final amplifier Q504 through a low pass filter The low pass filter removes unwanted high frequency harmonic com ponents 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 output with a diode D606 D607 and applies a voltage to IC501 IC501 compares the APC control voltage PC generated by the D A converter IC161 and DC amplifier IC203 with the detection output voltage IC501 generates the voltage to control Q503 and Q504 and stabilizes transmission output The APC circuit is configured to protect over current of Q503 and Q504 due to fluctuations of the load at the antenna end and to stabilize transmission output at voltage and tem perature variations See Fig 9 RF AMP Q501 DRIVE AMP Q503 FINAL AMP Q504 PRE DRIVE AMP Q502 DC AMP IC203 ANT SW D602 D603 D605 LPF ANT
64. 4 C408 C215 C409 C216 C217 C218 C602 C603 C410 X401 C605 C411 C412 C413 C608 C220 C222 C225 C226 C227 C228 C613 C614 C615 C230 C231 C232 C233 C623 VR601 C97 C98 C442 D201 D202 Q302 Q504 D G L302 D602 D603 L303 L304 C473 D608 IC201 1 4 5 8 1 4 5 8 IC202 IC203 L506 L507 L508 L509 Q351 Q354 G S D R302 R303 R304 R305 R306 R311 R312 R313 R314 R315 R316 R317 R318 R319 R320 R321 1 7 8 14 R322 R323 R324 R521 R524 R527 R528 R529 R530 R531 R532 C303 R533 C304 TH301 C305 R349 C310 C311 C312 C313 C314 R350 C315 R351 C316 R352 R353 C317 C318 R354 C319 R355 R161 R162 R164 C128 R165 R166 C321 C322 C323 C324 C525 R379 C536 C541 C542 C350 C351 C545 C546 C353 C354 C161 C355 C549 C162 C356 C163 C164 Q201 C165 C550 C552 C553 C554 C555 D302 D303 C559 C560 L401 L403 L404 C574 C576 C389 IC501 1 4 5 8 TH97 TH98 R203 R204 R205 R206 R207 R208 R209 TEMP1 PC 8T BPF AFV 8T TEMP2 1 10 31 Component side Foil side Layer
65. 70 R438 22k R203 100k R265 5 6k R308 330k C311 0 1u C254 0 22u C364 1000p SB 73 R275 15k R33 47k R276 47k R370 56 C36 1000p R412 10k D405 MA2S304 2SC4919 Q201 C306 1000p R273 12k C205 0 1u C258 0 01u C504 1000p 2SC4738 GR Q403 C536 1000p R510 1 5k 2SA1832 GR Q402 L501 68n C384 2p 5M C350 470p C274 0 22u C463 1000p C151 1800p D406 MA2S304 5M R212 82k L416 R315 18k C546 0 47u R800 F501 C403 100p R520 18k R605 15k C519 82p C383 1000p R369 0 R444 1k C101 1000p R109 1 5k C39 0 1u IC66 AT24C64A10SI18 or CAT24WC64JI 1 A0 2 A1 3 A2 4 GND 5 6 7 8 D61 02DZ18 X Y L201 R531 47k R442 100 C272 1000p R251 47k R205 820 R409 100k 70 IC402 UPB1509GV 1 2 3 4 5 6 7 8 D401 MA2S111 R516 0 Q36 KRC102S R519 33k C28 220p C409 0 1u B C104 0 1u C276 1000p R281 0 R356 1k 5M R317 10k C49 0 01u 34 C550 68p C526 680p 5M R105 1k C436 0 75p L303 330n R165 1k R266 5 6k C266 1u R425 47k 8R R435 100 C277 1000p 2SA1745 6 7 Q33 C557 0 01u R61 470 R415 0 C161 1000p C615 22p L4
66. 700p R418 1k 2SC3357 Q501 8C R431 100k C102 0 1u R260 220k R302 4 7k R206 100 C30 1000p R320 10k C225 1u16 C528 220p R404 10k R269 39k R32 470 R209 240k C264 0 033u R280 390 C317 0 1u R420 1k R375 100k C353 0 01u R440 100 17 5M C555 5p R225 150k C412 10u6 3 R210 18k C442 10u6 3 C318 0 1u R428 47k C25 1000p C15 100p R43 820 C33 1000p C19 680p C4 100p D26 B30 2205 05 Q12 UMG3N D21 B30 2205 05 J1 1 8 R41 56 CP1 R90 0724 05 C35 4700p D24 B30 2205 05 R54 56 C39 0 1u D2 C22 1000p Q6 KRC102S C40 0 1u L1 R44 18k CN1 R21 10k D30 B30 2205 05 R46 100 D31 1SS355 C27 1000p R51 0 D3 B30 2205 05 R23 10k R25 56k D4 C38 470p D22 B30 2205 05 C36 1u D23 B30 2205 05 R10 1 2k R48 47k R26 3 9k D19 B30 2205 05 R49 56 C32 1000p C24 0 1u C31 1000p R42 2 7k Q10 KRA225S R47 47k D25 B30 2205 05 R45 33k C16 100p BL NC NC NC SEG0 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
67. 9 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 P1MT 77 MICMT 78 NC 79 8RC 80 8TC 81 NC 82 SBC 83 NC 84 NC 85 NC 86 CM 87 MICKEY2 88 MICKEY 89 VOL 90 TEMP2 91 TEMP1 92 RSSI 93 SQIN 94 AVSS 95 DTMF IN 96 VREF 97 AVCC 98 NC NC NC 74 73 R124 47k R92 1k R91 1k 87 R127 47k 88 89 2SC2412K Q302 C321 68p C474 1000p SQC PKS PR1 5M 68 R125 47k R119 R120 R122 0 R121 R246 150k R247 120k R248 5 6K C249 4 7u6 3 2SC5488 Q351 R355 470 C355 18p C354 4 5p C356 3p R358 220 R361 180 C367 150p R363 330k C369 3p L354 50n L355 50n D351 HVC376B C368 27p R367 100 C373 6p C374 27p D352 HVC376B 3SK318 Q352 G1 D S G2 3SK318 Q353 G1 D S G2 R372 47k R374 27k L356 50n C382 27p C386 36p L357 35 5n D353 HVC376B D354 HVC376B C471 10p C128 1000p R126 47k L423 R114 47k 5M C385 8p C381 4 5p 2SK3019 Q252 2SK3019 Q253 8TC CPU80 FM DEMODULATION TP TEMPERATURE COMPENSATION TEMPERATURE COMPENSATION 5M WIDE CPU65 TXD RXD R
68. B1H102K 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 C 0 10UF K C31 33 CK73GB1H102K CHIP C 1000PF K C34 35 CK73GB1H472K CHIP C 4700PF K C36 CK73GB0J105K CHIP C 1 0UF K C38 CK73GB1H471K CHIP C 470PF K C39 40 CK73GB1C104K CHIP C 0 10UF K 103 2A E29 1201 04 INTER CONNECTOR LCD CN1 E40 6005 05 FLAT CABLE CONNECTOR J1 E08 0877 05 MODULAR JACK 104 2A J21 8463 03 HARDWARE FIXTURE LCD L1 L92 0138 05 FERRITE CHIP CP1 R90 0724 05 MULTI COMP 1K X4 R8 RK73GB1J102J CHIP R 1 0K J 1 16W R10 RK73GB1J122J CHIP R 1 2K J 1 16W R21 23 RK73GB1J103J CHIP R 10K J 1 16W R25 RK73GB1J563J CHIP R 56K J 1 16W R26 RK73GB1J392J CHIP R 3 9K J 1 16W R41 RK73FB2A560J CHIP R 56 J 1 10W R42 RK73GB1J272J CHIP R 2 7K J 1 16W R43 RK73GB1J821J CHIP R 820 J 1 16W R44 RK73GB1J183J CHIP R 18K J 1 16W R45 RK73GB1J333J CHIP R 33K J 1 16W R46 RK73GB1J101J CHIP R 100 J 1 16W R47 48 RK73GB1J473J CHIP R 47K J 1 16W R49 50 RK73FB2A560J CHIP R 56 J 1 10W R51 53 R92 1252 05 CHIP R 0 OHM J 1 16W R54 RK73FB2A560J CHIP R 56 J 1 10W DISPLAY UNIT X54 3450 10 TM 271A E TM 271A 271E 11 K M2 M3 M4 TM 271A E TM 271E PARTS LIST Ref No Address Parts No Description Desti nation New parts Ref No Address Parts No Descr
69. B1J221J CHIP R 220 J 1 16W R359 RK73GB1J224J CHIP R 220K J 1 16W R360 RK73GB1J474J CHIP R 470K J 1 16W R361 RK73GB1J181J CHIP R 180 J 1 16W R362 RK73GB1J474J CHIP R 470K J 1 16W R363 RK73GB1J334J CHIP R 330K J 1 16W R364 R92 1252 05 CHIP R 0 OHM J 1 16W R365 RK73GB1J104J CHIP R 100K J 1 16W R366 RK73GB1J471J CHIP R 470 J 1 16W R367 RK73GB1J101J CHIP R 100 J 1 16W R368 RK73GB1J104J CHIP R 100K J 1 16W R369 R92 1252 05 CHIP R 0 OHM J 1 16W R370 RK73GB1J560J CHIP R 56 J 1 16W R371 RK73GB1J393J CHIP R 39K J 1 16W R372 373 RK73GB1J473J CHIP R 47K J 1 16W R374 RK73GB1J273J CHIP R 27K J 1 16W R375 376 RK73GB1J104J CHIP R 100K J 1 16W R379 RK73GB1J104J CHIP R 100K J 1 16W R401 403 RK73GB1J102J CHIP R 1 0K J 1 16W R404 RK73GB1J103J CHIP R 10K J 1 16W R406 RK73GB1J103J CHIP R 10K J 1 16W R407 RK73GB1J152J CHIP R 1 5K J 1 16W TM 271A 271E 15 K M2 M3 M4 TM 271A E TM 271E PARTS LIST Ref No Address Parts No Description Desti nation New parts Ref No Address Parts No Description Desti nation New parts TX RX UNIT X57 685X XX R408 RK73GB1J100J CHIP R 10 J 1 16W R409 RK73GB1J104J CHIP R 100K J 1 16W R410 RK73GB1J822J CHIP R 8 2K J 1 16W R411 RK73GB1J562J CHIP R 5 6K J 1 16W R412 413 RK73GB1J103J CHIP R 10K J 1 16W R414 RK73GB1J471J CHIP R 470 J 1 16W R415 R92 1252 05 CHIP
70. C2 VCC1 IN IN GND SDA SCL WP VCC SQIN CPU93 SBC CPU82 RESET CPU10 INT CPU18 1 2Vcc DTMF IN CPU95 RSSI CPU92 IC301 TK14489V SCAN SCAN SQLIN FLAMPO RFIN GND Hy_C FLAMPI RSSI AFO VCC IF_IN DEC1 DEC2 PH_S QUCO OSC B OSC E NC MIX_O 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 XF351 49 95MHz L71 0620 05 CF301 L72 0993 05 CF302 L72 0999 05 R 3 22V R 4 65V R 4 27V R 0 66V T 0 48V N 5V W 0V T 1 23V R 2 46V R 4 98V R 7 99V R 7 42V R 4 84V T 5 73V 4 98V R 0 75V R 0 56V R 4 7mV SQ OFF 4 97V SQ ON R 1 44V R 6 34V R 6 64V N 0V W 5V T 1 26V T 6 8V T 0 88V T 7 82V R 1 23V R 5V R 2 7V R 7 84V T 5 61V R 2 88V R 5 86V R 3 16V TX RX UNIT X57 685X XX TM 271A 271E SCHEMATIC DIAGRAM 36 K L M N O X57 685 3 3 t C33 1000p C559 0 1u R305 1 8k L603 5T C43 22u10 L601 6T C527 1000p R304 4 7k B 5M R259 12k C617 1000p IC33 NJM78L05UA 2 COM 3 IN 1 OUT 2 COM 3 IN 1 OUT R252 470k 2SA1641 S T Q31 R261 120k C263 0 033u C55 0 1u R36 1 5k 5C R258 2 7k C29 470p R527 220k R350 27k BSB C603 1000p C257 0 039u R41 330k C41 22u10 R6
71. C401 R249 C402 C403 C210 C404 C211 C212 C406 C213 C214 C408 R250 C215 C409 C216 C217 C218 C602 C603 C410 X401 C605 C411 C412 C413 C608 C414 C220 C416 C222 C417 C225 C226 C227 C228 C613 R268 C614 R269 C615 C422 C423 C424 C230 C425 C231 C232 C82 C233 C83 C235 R271 R272 R273 R274 F501 Q35 R275 R276 Q36 R277 C623 R278 VR601 R279 R280 C97 C98 C249 C442 C250 D3 D4 D5 D6 D201 D202 Q302 C267 C268 D401 D402 C270 C271 C272 C273 Q503 S S G D C274 Q504 D G C275 C276 C277 C278 F1 L302 D602 D603 L303 L304 C473 D608 C281 IC201 1 4 5 8 1 4 5 8 C475 IC202 C476 IC203 IC204 IC205 1 3 4 5 1 3 4 5 L503 L504 L505 L506 L507 L508 IC401 L509 D251 Q351 Q354 G S D R101 R105 R106 R302 R303 R304 R305 R306 R118 R119 E SP R311 R312 R313 R120 R314 R121 R315 R316 R122 R317 R318 R125 R319 R320 R321 1 7 8 14 R322 R516 R323 R324 R518 R519 R520 R521 R523 R524 R525 R527 R528 R529 R530 R531 R532 C303 R533 C304 TH301 C
72. D603 D605 ANT SW IC161 D A IC203 DC AMP Q302 X3 multiply IC402 1 2 divider X401 TCXO IC301 IF system 1st local OSC VCO PLL W NO EVOL2 CF301 Wide CF302 Narrow TV CPU L354 355 D351 352 BPF Fig 2 Receiver system TM 271A 271E 3 Wide Narrow Switching Circuit The Wide port pin 65 and Narrow port pin 64 of the CPU is used to switch between ceramic filters When the Wide port is high the ceramic filter SW diodes D303 D302 cause CF301 to turn on to receive a Wide signal When the Narrow port is high the ceramic filter SW di odes D303 D302 cause CF302 to turn on to receive a Nar row signal See Fig 3 AF Signal System The detection signal from IF IC IC301 goes to D A con verter IC161 to adjust the gain and is output to AF filter IC251 for characterizing the signal The AF signal output from IC251 and the DTMF signal BEEP signal are summed and the resulting signal goes to the D A converter IC161 The AFO output level is adjusted by the D A converter The signal output from the D A converter is input to the audio power amplifier IC252 The AF signal from IC252 switches between the internal speaker and speaker jack J1 output See Fig 4 Squelch Circuit The detection output from the FM IF IC IC301 passes through a noise amplifier Q301 to detect noise A voltage is applied to the CPU IC101 The CPU controls squelch ac cording to the voltag
73. F SWITCH NARROW NARROW CPU64 D351 352 IF SWITCH RF BPF TUNING D353 354 IF AMP 50 4MHz D501 8R 8R IF SWITCH W NI EVOL1 EEPROM RF AMP CPU AFV AF MUTE AF MUTE AFI EVOL12 DIVIDER HETERO AFM CPU50 WIDE RF AMP DRIVE STAGE BUFFER AMP RF BPF TUNING MIXER RF AMP 8RC CPU76 8TC CPU80 AMPSW CPU52 SPM CPU51 BRI 8RC CPU76 VOLO EVOL11 W NO EVOL2 MIC PC TV RF AMP DRIVE STAGE CM MICKEY VOL TV TX RX CPU20 QT DQT CPU1 EVLLD CPU8 TX DTMF UL CPU21 PLLE CPU3 XOUT CPU11 XIN CPU13 POWER M1MT CPU76 P9MT CPU75 MICMT CPU77 CK CPU54 DT CPU53 W NO EVOL2 PC TV W NI EVOL1 MIC VOLI EVOL12 VOLO EVOL11 BRI SQIN CPU93 RSSI CPU92 SBC CPU82 1 2Vcc DTMF IN CPU95 BSHIFT IC101 30622MAA B85GP NC SQC PKS CLKFLS BSYFLS TXD RXD PTT NC NC NC EMPFLS NC NC NC NC CEFLS NC NC NC NC NC AFM EEPWP NC SPM AMPSW DT CK NC DST1 DST2 DST3 DST4 VCC NC VSS ADJ NARROW WIDE NC NC CL CE DO to LCD DI from LCD NC ENCB ENCA P9MT 99 100 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 SPM CPU51 AMPSW CPU52 W NI EVOL1 VOLI EVOL12 SW1 SW2 OUT VC
74. HIELD WHITE GRAY YELLOW PTT E MIC E MIC HK 1 8 TM 271A 271E 23 ADJUSTMENT Adjustment Location Adjustment Points Notes EEPROM The tuning data Deviation Squelch etc for the EEP ROM is stored in memory When parts are changed re adjust the transceiver AF PA IC IC252 How to mounting the IC252 Speaker Cable The speaker cable should be formed before mounting the shield cover as below Fuse To mount the fuse the cable terminal direction must be as follow Except the E type models 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 ANT TC401 TC402 L301 BPF B E TX RX unit Foil side F501 VR601 Q503 Q504 R516 R518 R524 IC252 GND PR9 PR1 PKS SQC PKD 5M CNVSS RESET POWER RXD TXD CV RF DC B E TEMP1 PC 8T BPF AFV 8T TEMP2 TX RX unit Component side E type models TM 271A 271E 24 ADJUSTMENT PCB Section 1 Setting 1 Power supply voltage DC Power supply terminal 13 8V 2 VCO lock 1 CH TX high Digital voltmeter CV TC402 5 5V 0 2V voltage 2 CH RX high TC401 5 5V 0 2V 3 CH TX low Check 0 5V or more 4 CH RX low 3 IF coil 1 CH RX center Wide SSG AFV L301 3 25 3 35V DC 2 SSG output
75. IP C 0 010UF K C228 C92 0560 05 CHIP TAN 10UF 6 3WV C230 CK73GB1C104K CHIP C 0 10UF K C231 232 CK73GB1H102K CHIP C 1000PF K C233 C92 0507 05 CHIP TAN 4 7UF 6 3WV C235 CK73GB1A105K CHIP C 1 0UF K C249 C92 0507 05 CHIP TAN 4 7UF 6 3WV 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 CK73GB1H102K CHIP C 1000PF K C263 264 CK73GB1C333K CHIP C 0 033UF K C265 CK73GB1C104K CHIP C 0 10UF K C266 CK73GB1A105K CHIP C 1 0UF K C267 CK73GB1A474K CHIP C 0 47UF K C268 CK73GB1A105K CHIP C 1 0UF K C270 C92 0507 05 CHIP TAN 4 7UF 6 3WV C271 CK73GB1H122K CHIP C 1200PF K C272 CK73GB1H102K CHIP C 1000PF K C273 CK73GB1A105K CHIP C 1 0UF K C274 CK73FB1C224K CHIP C 0 22UF K C275 CK73GB1A105K CHIP C 1 0UF K C276 277 CK73GB1H102K CHIP C 1000PF K C278 CK73GB1C104K CHIP C 0 10UF K C279 C92 0516 05 CHIP TAN 4 7UF 16WV C280 C92 0040 05 CHIP ELE 47UF 16WV C281 CK73GB1H102K CHIP C 1000PF K C282 CE04EQ1E331M ELECTRO 330UF 25WV C283 CK73GB1H102K CHIP C 1000PF K C301 C92 0507 05 CHIP TAN 4 7UF 6 3WV C302 CK73GB1H102K CHIP C 1000PF K C303 CK73GB1H472K CHIP C 4700PF K C304 305
76. J CHIP C 150PF J C368 CC73GCH1H270J CHIP C 27PF J C369 CC73GCH1H030B CHIP C 3 0PF B C370 CK73GB1H102K CHIP C 1000PF K C371 CC73GCH1H020B CHIP C 2 0PF B C372 CK73GB1H102K CHIP C 1000PF K C373 CC73GCH1H060B CHIP C 6 0PF B C374 CC73GCH1H270J CHIP C 27PF J C375 379 CK73GB1H102K CHIP C 1000PF K C380 CC73GCH1H101J CHIP C 100PF J C381 CC73GCH1H4R5B CHIP C 4 5PF B C382 CC73GCH1H270J CHIP C 27PF J C383 CK73GB1H102K CHIP C 1000PF K C384 CC73GCH1H020B CHIP C 2 0PF B C385 CC73GCH1H080B CHIP C 8 0PF B C386 CC73GCH1H360J CHIP C 36PF J C387 CK73GB1H102K CHIP C 1000PF K C388 CC73GCH1H070B CHIP C 7 0PF B C389 CK73GB1H102K CHIP C 1000PF K C390 CC73GCH1H090B CHIP C 9 0PF B C391 CC73GCH1H160G CHIP C 16PF G C400 CK73GB1C104K CHIP C 0 10UF K C401 403 CC73GCH1H101J CHIP C 100PF J C404 C92 0662 05 CHIP TAN 15UF 6 3WV C406 CK73GB1H102K CHIP C 1000PF K C408 CC73GCH1H220J CHIP C 22PF J C409 CK73GB1C104K CHIP C 0 10UF K C410 C92 0560 05 CHIP TAN 10UF 6 3WV C411 CK73GB1C104K CHIP C 0 10UF K C412 C92 0560 05 CHIP TAN 10UF 6 3WV C413 CK73GB1H103K CHIP C 0 010UF K C414 CK73GB1C104K CHIP C 0 10UF K C416 418 CK73GB1H102K CHIP C 1000PF K C421 422 CK73GB1H471K CHIP C 470PF K C423 C92 0555 05 CHIP TAN 0 047UF 35WV C424 C92 0004 05 CHIP TAN 1 0UF 16WV C425 C92 0001 05 CHIP C 0 1UF 35WV C426 CC73GCH1H300J CHIP C 30
77. L 90 TEMP2 91 TEMP1 92 RSSI 93 SQIN 94 AVSS 95 DTMF IN 96 VREF 97 AVCC 98 NC NC NC 74 73 5C R234 0 IC204 BU4S66 1 I O 2 O I 3 VSS 4 CONT 5 VDD C222 0 1u R224 560 PKD PKD 5C R124 47k R93 6 8k R92 1k R94 10k R91 1k TH98 100k C97 1000p TH97 100k C98 1000p 87 R127 47k 88 89 C216 39p IC161 M62363FP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 R222 10k IC203 BA10324AFV VCC VEE C209 68p C165 1u X401 L77 1944 05 R406 10k 2SC2412K Q302 C321 68p 8C 5C 5M 88 C475 1000p C476 1000p C473 1000p C400 0 1u L406 270n L407 270n C426 30p L409 27u L408 33n C427 8p L410 27u R423 220 C429 1p R429 270 L411 270n C434 150p L413 47n C435 10p L412 270n L414 27u C439 10p R424 100 L415 27u C440 11p L401 L418 33n C474 1000p R522 330 R523 39k C533 100p L505 15n C542 12p C541 12p C552 22p C553 3p C614 C623 3p C602 12p C605 15p D603 XB15A709 VR601 47k R607 330 SQC PKS PR1 PR9 5M 68 R125 47k R119 R120 R122 0 R121 R246 150k C305 330
78. N X tal 8MHz 14 VCC 5V 15 NMI Input only 16 NC I 17 POWER I Power key input 18 INT I com stop 19 NC I 20 TX RX O TX RX 21 UL I PLL unlock detect 22 23 NC I 24 EEPSDT I O EEPROM data 25 EEPCK O EEPROM clock 26 EEPWP O EEPROM write protect 27 28 NC I Nch open drain 29 SQC O Squelch signal output for TNC TxD for flash 30 PKS I PTT input for TNC RxD for flash 31 CLKFLS I GND 32 BSYFLS O Vcc 33 TXD O To PC 34 RXD I From PC 35 PTT I PTT input 36 38 NC I 39 EMPFLS I O GND 40 43 NC I 44 CEFLS I O Vcc 45 49 NC I 50 AFM O AF mute 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 Input data from LCD 72 NC I 73 ENCB I Encoder input B 74 ENCA I Encoder input A 75 TNC9600 O TNC speed H 9600 L 1200 76 TNC1200 O TNC speed L 9600 H 1200 77 MICMT O MIC mute 78 NC I NC 79 8RC O 8R control 80 8TC O 8T
79. ON KEC RF AMP DRIVE STAGE AF MUTE MOD BUFFER AMP SUM AMP RF BPF TUNING AF MUTE MIXER RF AMP 8R PLL SYNTHESIZER SEG9 SEG15 SEG7 SEG10 SEG23 SEG3 SEG21 SEG11 COM2 SEG13 COM1 RESISTOR COM3 SEG24 KEY ILLUMINATION SEG1 LCD B38 0885 05 SEG17 SEG27 SEG29 SEG4 SEG26 SEG31 SEG5 SEG14 SEG18 SEG19 VARIABLE SEG8 SEG12 SEG2 SEG20 LCD ILLUMINATION DISPLAY UNIT X54 3450 10 SEG22 MR SEG0 SEG16 COM0 SEG6 SEG28 SEG25 SEG30 POWER SQC PKS PR1 PR9 PKD 8RC CPU76 IC252 LA4600 1 2 3 4 5 6 7 8 9 10 PTT BRI RXD POWER VOL 8C 5C DO CL CE DI MICKEY ENCB CM ENCA MIC ENCODER 8TC CPU80 AMPSW CPU52 SPM CPU51 BRI 8RC CPU76 VOLO EVOL11 W NO EVOL2 MIC PC TV LCD CONTROLLER KEY BACKLIT SWITCH DIMMER FUNCTION SWITCH LCD BACKLIT D2 4 LCD BACKLIT SWITCH DC SWITCH KEY BACKLIT D19 30 MHz amp MENU ADJUASTMENT ON OFF amp VOLUME ADJUASTMENT SINGLE ANALOG SW SINGLE ANALOG SW DC SW SB DC SW 8R DC SW 8T MOD BUFFA 1 2Vcc DC AMP Q201 RF AMP DRIVE STAGE OVER VOLTAGE DETECTION SURGE ABSORPTION D5 6 BRI CM MICKEY VOL TV AUDIO AMP RIPPLE FILTER 144 148MHz 144 146MHz TM 271A TM 271E E K M3 M2 M4 X57 685X XX 0 23
80. OX 22745 2201 East Dominguez Street Long Beach CA 90801 5745 U S A KENWOOD ELECTRONICS CANADA INC 6070 Kestrel Road Mississauga Ontario Canada L5T 1S8 KENWOOD ELECTRONICS DEUTSCHLAND GMBH Rembr cker Str 15 63150 Heusenstamm Germany KENWOOD ELECTRONICS BELGIUM N V Leuvensesteenweg 248 J 1800 Vilvoorde Belgium KENWOOD ELECTRONICS FRANCE S A 13 Boulevard Ney 75018 Paris France KENWOOD ELECTRONICS U K LIMITED KENWOOD House Dwight Road Watford Herts WD18 9EB United Kingdom KENWOOD ELECTRONICS EUROPE B V Amsterdamseweg 37 1422 AC Uithoorn The Netherlands KENWOOD ELECTRONICS ITALIA S p A Via G Sirtori 7 9 20129 Milano Italy KENWOOD IBERICA S A Bolivia 239 08020 Barcelona Spain KENWOOD ELECTRONICS AUSTRALIA PTY LTD A C N 001 499 074 16 Giffnock Avenue Centrecourt Estate North Ryde N S W 2113 Australia KENWOOD ELECTRONICS HONG KONG LTD Unit 3712 3724 Level 37 Tower one Metroplaza 223 Hing Fong Road Kwai Fong N T Hong Kong KENWOOD ELECTRONICS TECHNOLOGIES S PTE LTD Sales Marketing Division 1 Ang Mo Kio Street 63 Singapore 569110 TM 271A E SPECIFICATIONS GENERAL Frequency Range TX K M4 144 148MHz E 144 146MHz M2 M3 136 174MHz RX K E M2 M3 136 174MHz M4 144 148MHz Mode
81. PF J C427 CC73GCH1H080B CHIP C 8 0PF B C428 CK73GB1H471K CHIP C 470PF K C429 CC73GCH1H010B CHIP C 1 0PF B C430 CC73GCH1H4R5B CHIP C 4 5PF B C431 CC73GCH1H050B CHIP C 5 0PF B C432 CC73GCH1H0R3B CHIP C 0 3PF B C434 CC73GCH1H151J CHIP C 150PF J C435 CC73GCH1H100C CHIP C 10PF C C436 CC73GCH1HR75B CHIP C 0 75PF B C437 CK73GB1H471K CHIP C 470PF K C438 CC73GCH1H0R5B CHIP C 0 5PF B C439 CC73GCH1H100C CHIP C 10PF C C440 CC73GCH1H110G CHIP C 11PF G C441 CC73GCH1H0R5B CHIP C 0 5PF B C442 C92 0560 05 CHIP TAN 10UF 6 3WV C444 CK73GB1H471K CHIP C 470PF K C448 449 CK73GB1H471K CHIP C 470PF K C450 C92 0795 05 CHIP TAN 22UF 10WV C451 452 CK73GB1H471K CHIP C 470PF K C453 CK73GB1H221K CHIP C 220PF K C454 CC73GCH1H060B CHIP C 6 0PF B C455 CC73GCH1H030B CHIP C 3 0PF B C456 CC73GCH1H020B CHIP C 2 0PF B C457 CK73GB1H102K CHIP C 1000PF K C458 CK73GB1H221K CHIP C 220PF K C459 CK73GB1H102K CHIP C 1000PF K C460 CC73GCH1H180J CHIP C 18PF J C461 CK73GB1H102K CHIP C 1000PF K C462 CC73GCH1H100C CHIP C 10PF C C463 464 CK73GB1H102K CHIP C 1000PF K C465 CC73GCH1H220J CHIP C 22PF J C466 CC73GCH1H101J CHIP C 100PF J C467 CK73GB1H102K CHIP C 1000PF K C468 CK73GB1H221K CHIP C 220PF K C471 CC73GCH1H100C CHIP C 10PF C C473 476 CK73GB1H102K CHIP C 1000PF K C501 502 CK73GB1H102K CHIP C 1000PF K C503 CC73GCH1H101J CHIP
82. POWER DET D606 D607 IC501 VR601 APC CONTROL D409 IC161 PC TVO PC Q411 RF AMP Q501 RF AMP Q502 PRE DRIVE AMP Q503 ANT DRIVE AMP Q504 FINAL AMP IC402 1 2 DIVIDER IC161 Q406 D A CONVERTER D A CONVERTER D A CONVERTER X401 TCXO 16 8MHz VCO IC401 PLL Q410 BUFFER Q404 RF AMP IC203 BUFFER IC101 IC161 MIC KEY INPUT CPU IC161 IC203 SUM AMP IC202 IC201 MIC MIC IDC SPLATTER FILTER Fig 9 APC circuit Fig 8 Transmitter system CIRCUIT DESCRIPTION TM 271A 271E 5 Control Circuit The CPU carries out the following tasks See Fig 10 1 Controls the WIDE NARROW TX RX outputs 2 Adjusts the AF signal level of the AF filter IC251 and turns the filter select compounder on or off 3 Controls the display unit 4 Controls the PLL IC401 5 Controls the D A converter IC161 and adjusts the vol ume modulation and transmission power Memory Circuit The transceiver has an 64k bit EEPROM IC66 The EEPROM contains adjustment data The CPU IC101 con trols the EEPROM through three serial data lines See Fig 11 IC161 D A converter IC401 PLL IC101 CPU LD DT CK PLLE EEPCK IC101 CPU IC66 EEPROM EEPSDT EEPWP Display Circuit The CPU IC101 controls the display LCD and LEDs When power is on the LCD driver will use the BL line to con trol the LCD illumination a
83. R 0 OHM J 1 16W R416 RK73GB1J471J CHIP R 470 J 1 16W R417 RK73GB1J224J CHIP R 220K J 1 16W R418 RK73GB1J102J CHIP R 1 0K J 1 16W R419 RK73GB1J272J CHIP R 2 7K J 1 16W R420 RK73GB1J102J CHIP R 1 0K J 1 16W R421 RK73GB1J152J CHIP R 1 5K J 1 16W R422 RK73GB1J103J CHIP R 10K J 1 16W R423 RK73GB1J221J CHIP R 220 J 1 16W R424 RK73GB1J101J CHIP R 100 J 1 16W R425 426 RK73GB1J473J CHIP R 47K J 1 16W R427 RK73GB1J104J CHIP R 100K J 1 16W R428 RK73GB1J473J CHIP R 47K J 1 16W R429 RK73GB1J271J CHIP R 270 J 1 16W R430 RK73GB1J221J CHIP R 220 J 1 16W R431 RK73GB1J104J CHIP R 100K J 1 16W R432 RK73GB1J102J CHIP R 1 0K J 1 16W R433 RK73GB1J472J CHIP R 4 7K J 1 16W R434 R92 1252 05 CHIP R 0 OHM J 1 16W R435 RK73GB1J101J CHIP R 100 J 1 16W R436 RK73GB1J124J CHIP R 120K J 1 16W R437 RK73GB1J102J CHIP R 1 0K J 1 16W R438 RK73GB1J223J CHIP R 22K J 1 16W R439 RK73GB1J473J CHIP R 47K J 1 16W R440 442 RK73GB1J101J CHIP R 100 J 1 16W R443 RK73GB1J222J CHIP R 2 2K J 1 16W R444 RK73GB1J102J CHIP R 1 0K J 1 16W R501 RK73GB1J102J CHIP R 1 0K J 1 16W R502 RK73GB1J271J CHIP R 270 J 1 16W R503 RK73GB1J180J CHIP R 18 J 1 16W R504 RK73GB1J271J CHIP R 270 J 1 16W R505 RK73GB1J222J CHIP R 2 2K J 1 16W R506 RK73GB1J103J CHIP R 10K J 1 16W R507 RK73GB1J100J CHIP R 10 J 1 16W R509 RK73GB1J220J CHIP R
84. R37 R92 1252 05 CHIP R 0 OHM J 1 16W R38 RK73GB1J334J CHIP R 330K J 1 16W R39 RK73GB1J474J CHIP R 470K J 1 16W R40 RK73GB1J394J CHIP R 390K J 1 16W R41 RK73GB1J334J CHIP R 330K J 1 16W R61 RK73GB1J471J CHIP R 470 J 1 16W R62 63 R92 1252 05 CHIP R 0 OHM J 1 16W R70 RK73GB1J473J CHIP R 47K J 1 16W R81 RK73GB1J473J CHIP R 47K J 1 16W R82 R92 1252 05 CHIP R 0 OHM J 1 16W R86 R92 1252 05 CHIP R 0 OHM J 1 16W R87 RK73GB1J102J CHIP R 1 0K J 1 16W R91 92 RK73GB1J102J CHIP R 1 0K J 1 16W R93 RK73GB1J682J CHIP R 6 8K J 1 16W R94 RK73GB1J103J CHIP R 10K J 1 16W R101 102 RK73GB1J473J CHIP R 47K J 1 16W R103 106 RK73GB1J102J CHIP R 1 0K J 1 16W R109 RK73GB1J152J CHIP R 1 5K J 1 16W R110 RK73GB1J473J CHIP R 47K J 1 16W R111 RK73GB1J102J CHIP R 1 0K J 1 16W R114 RK73GB1J473J CHIP R 47K J 1 16W R118 R92 1252 05 CHIP R 0 OHM J 1 16W R119 R92 0670 05 CHIP R 0 OHM K M3 M4 R119 R92 0670 05 CHIP R 0 OHM E R120 R92 1252 05 CHIP R 0 OHM J 1 16W M4 R120 123 R92 1252 05 CHIP R 0 OHM J 1 16W K R121 123 R92 1252 05 CHIP R 0 OHM J 1 16W E R122 123 R92 1252 05 CHIP R 0 OHM J 1 16W M2 M3 M4 R124 127 RK73GB1J473J CHIP R 47K J 1 16W R151 RK73GB1J103J CHIP R 10K J 1 16W R152 RK73GB1J472J CHIP R 4 7K J 1 16W TM 271A 271E 14 PARTS LIST K M2 M3 M4 TM 271A E TM 271E Ref No Address Parts No Descripti
85. SEG17 SEG27 SEG29 SEG4 SEG26 SEG31 SEG5 SEG14 SEG18 SEG19 VARIABLE SEG8 SEG12 SEG2 SEG20 LCD ILLUMINATION DISPLAY UNIT X54 3450 10 SEG22 MR SEG0 SEG16 COM0 SEG6 SEG28 SEG25 SEG30 ENCODER LCD CONTROLLER KEY BACKLIT SWITCH DIMMER FUNCTION SWITCH LCD BACKLIT D2 4 LCD BACKLIT SWITCH DC SWITCH KEY BACKLIT D19 30 MHz amp MENU ADJUASTMENT ON OFF amp VOLUME ADJUASTMENT 144 148MHz 144 146MHz TM 271A TM 271E E K M3 M2 M4 X57 685X XX 0 23 0 10 0 21 0 22 2 71 Func CALL VFO REV CM HOOK MIC ME PTT GND 8C MBL Key A ENCODER A CM ENCODER B MIC KEY DI from LCD CE CL DO 5C 8C VOL POWER RXD BRI PTT GND ME MIC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 2SB1132 Q R Q9 IC3 LC75854W or PT6554LQ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 SEG28 SEG29 SEG30 SEG31 NC NC NC COM0 COM1 COM2 COM3 KS1 KS2 NC NC NC SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 SEG20 SEG20 SEG22 SEG23 SEG24 SEG25 SEG26 SEG27 C203 0 027u 0 027u 0 047u 0 027u 0 027u 1000p 1000p 680p 1000p C206 1000p 0 022u 0 022u 0 022u 0 022u C207 0 039u NO
86. SORPTION KEC AF MUTE AF MUTE 8R POWER IC252 LA4600 1 2 3 4 5 6 7 8 9 10 PTT BRI RXD POWER VOL 8C 5C DO CL CE DI MICKEY ENCB CM ENCA MIC DC SW SB DC SW 8R DC SW 8T OVER VOLTAGE DETECTION BRI AUDIO AMP RD70HVF1 01 Q504 AMPSW CPU52 MIC 8TC CPU80 SPM CPU51 8RC CPU76 BRI PC TV VOLO EVOL11 W NO EVOL2 2SC2412K Q301 8 9 10 11 12 13 14 IC251 BA10324AFV DTMF IN CPU95 INT CPU18 RESET CPU10 SBC CPU82 1 2Vcc SQIN CPU93 INT CPU18 RESET CPU10 SBC CPU82 IC35 BD4740G IC31 KIA7808AF IC32 NJM78L05UA AMPSW CPU52 VOLO EVOL11 SPM CPU51 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 C259 0 01u C260 0 01u C270 4 7u6 3 T 1 6V R 4 02V R 13 8V T 13 45V T 1 45V R 4 98V R 2 7V R 7 9V R 13 8V R 4 98V T 7 55V R 13 66V T 12 94V R 4 31V R 1 15V R 3 37V R 4 98V R 1 74V R 3 3V R 7 9V T 0 76V T 7 84V R 7 95V T 2 5V T 1 46V T 7 85V R 0 87V T 4 97V T 7 84V TX RX UNIT X57 685X XX SCHEMATIC DIAGRAM TM 271A 271E 37 7 6 5 4 3 2 1 T S R Q P X54 345 1 1 C25 1000p C15 100p R43 820 C33 1000p C19 680p C4 100p D26 B30 2205 05 Q12 UMG3N D21 B30 2205 05 J1
87. V M 2 SSG output Distortion meter 115dBm 0 4 V Wide Narrow Mod 1kHz Dev 3 0kHz Wide Dev 1 5kHz Narrow 3 Squelch 1 CH RX low Wide open CH RX center Wide Narrow CH RX high Wide 2 SSG output 125dBm 0 126 V 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 501 V 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 encoder 5 S meter 1 CH RX center Wide S1 2 SSG output 118dBm 0 28 V Mod 1kHz Dev 3 0kHz 6 S meter 1 CH RX center Wide full scale 2 SSG output 96dBm 3 54 V Mod 1kHz Dev 3 0kHz Item Condition Test equipment Terminal Parts Method Specifications Remarks Measurement Adjustment ADJUSTMENT TM 271A 271E 27 TX RX UNIT X57 685X XX 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 for LCD 7 CL Clock for LCD 8 DO Data transfer to LCD 9 5C 5V DC power supply 10 8C 8V DC supply 11 VOL Volume 12 POWER Power Key 13 RXD RXD 14 BRI Brightness Control 15 PTT PTT 16 GND Groun
88. X Component side view J72 0906 09 0 10 TM 271A K 0 21 TM 271A M2 0 22 TM 271A M3 0 23 TM 271A M4 2 71 TM 271E E TX RX UNIT X57 685X XX Component side view J72 0906 09 0 10 TM 271A K 0 21 TM 271A M2 0 22 TM 271A M3 0 23 TM 271A M4 2 71 TM 271E E PC BOARD TM 271A 271E Ref No Address IC33 12B IC161 1N IC201 10P IC202 11P IC203 12P IC204 10I IC205 11I IC252 10B IC401 12J IC501 8J Q35 13C Q36 12C Q201 11O Q252 12F Q253 12F Q254 11D Q255 10D Q302 13K Q351 12N Q354 9O Q402 12H Q403 13H Q503 6G Q504 5K D3 12E D4 12E D5 11E D6 11E D201 11O D202 10O D251 9E D302 12O D303 12O D401 12J D402 13I D503 8J D602 7P D603 7Q D608 8L J I H G F E D C B A 1 2 3 4 5 6 7 8 9 10 11 12 13 14 CF301 CF302 R601 R602 R415 R416 R417 R423 R424 R425 R426 R427 R429 R800 ANT R430 R431 R432 R433 R434 R435 R436 R437 R438 R439 R440 R441 R442 R443 R444 R251 R252 R253 R254 R255 R256 R257 R258 R259 C606 C607 C418 R260 TC401 R261 R262 R263 R264 C610 R265 C611 R266 C421 C616 C617 C4 C427 C428 C429 C430 C431 C432 C C437 C438 C439 C440 C441 C444 C251 C252 C253 C448 C254 C255 C449 C256 C257 C258 C259 C45
89. Y UNIT X54 3450 10 Foil side view J72 0905 09 DISPLAY UNIT X54 3450 10 Component side view J72 0905 09 PC BOARD TM 271A 271E 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 D29 3J D30 3K Ref No Address IC3 11H Q6 10M Q9 11M Q10 10N Q12 10N D31 9C J I H G F E D C B A 1 2 3 4 5 6 7 8 9 10 11 12 13 14 C20 R401 R402 R403 R408 C28 R409 C29 J1 EXT SP R410 R411 R412 R413 R414 R418 R419 IC33 O G B C E I R420 R421 R422 C44 C45 C49 R236 R237 C50 C201 C51 C52 R246 R248 C400 C401 R249 C402 C403 C408 R250 C410 C411 C412 C413 C414 C416 C417 R268 R269 C422 C423 C424 C425 C82 C83 C235 R271 R272 R273 R274 F501 Q35 R275 R276 Q36 R277 R278 R279 R280 C249 C250 D3 D4 D5 D6 C267 C268 D401 D402 C270 C271 C272 C273 Q503 S S G D C274 C275 C276 C277 C278 F1 C281 C475 C476 IC204 IC205 1 3 4 5 1 3 4 5 L503 L504 L505 IC401 D251 R101 R105 R106 R118 R119 E SP R120 R121 R122 R125 R516 R518 R519 R520 R521 R523 R524 R525 R5
90. als rectangular wave are passed through a band limiting filter For 9600bps GMSK for example compared to 4800Hz signals nearly sine wave signals passed through a filter these signals have a hissing sound like digital modulation when listened to by ear Different types of modulation such as GMSK is distin guished by the type of band limiting filter Pin Pin Specification No Name 1 PKD bps switching 1200bps 9600bps Modulation input 400mVp p 4Vp p Frequency shift 3 0 5kHz 2 2 0 5kHz 4 PR9 Output level 500mVp p 10k Always output during reception 5 PR1 Output level 500mVp p 10k Not output when squelch off Table 4 Data terminal input output level TM 271A 271E 7 Transmission Signals Transmission modulation signals enter from PKD of the data terminal CN2 The path to the modulation depends on whether communications are 1200bps or 9600bps mode For 1200bps mode the transmission modulation signals from single analog switch IC204 pass through MIC amplifier IC201 202 and summing amplifier IC203 and go to VCO X401 through D A converter IC161 For 9600bps mode the transmission modulation signals from single analog switch IC205 pass through summing amplifier IC303 go to TCXO X401 and VCO through D A converter IC161 See Fig 17 Reception Signals PR9 is the 9600bps data communications reception out put It outputs the FM detection circuit output through an AF fil
91. ansmission operating frequency range Adjusted in 1 point for the Narrow Band Width 4 Adjusted in 3 points in the reception operating frequency range 5 Adjusted in 3 points for the Wide Band Width in the re ception operating frequency range Adjusted in 1 point for the Narrow Band Width How to Enter Adjustment Mode To perform adjustments with transceiver panel keys the transceiver must be set to Adjustment Mode While shorting the following figure terminals on the PCB with tweezers etc turn the power switch ON to enter Ad justment Mode See Fig 1 LCD Display When Adjustment Mode is Enabled Example of Frequency Tune See Table 1 for an LCD display list Fig 1 Fig 2 Fig 3 TM 271A 271E 21 Adjustment Item Adjustment On the Note Transmit Receive Signalling Frequency Point Display MHz MHz Frequency Tune Center 155 10 155 05 TX High Power Low H icon appear 136 10 136 05 Low 142 10 142 05 Center 150 10 150 05 High 156 10 156 05 High 173 90 173 95 TX Low Power Low L icon appear 136 10 136 05 Low 142 10 142 05 Center 150 10 150 05 High 156 10 156 05 High 173 90 173 95 DCS Balance Low DCS icon appear 136 10 136 05 DCS 023N Center 155 10 155 05 High 173 90 173 95 DCS Balance Narrow Center DCS and N icon appear 155 10 155 05 Max Deviation Low 136 10 136 05 Cen
92. d 17 GND Ground 18 MIC Microphone CN2 1 GND Ground 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 for LCD 7 CL Clock for LCD 8 DO Data transfer to LCD 9 5C 5V DC power supply 10 8C 8V DC supply 11 VOL Volume 12 POWER Power Key 13 RXD RXD 14 BRI Brightness Control 15 PTT PTT 16 GND Ground 17 ME ME 18 MIC Microphone TERMINAL FUNCTION J I H G F E D C B A 1 2 3 4 5 6 7 8 9 10 11 12 13 14 D2 COM3 COM2 COM3 COM0 SEG31 SEG30 SEG29 SEG28 SEG27 SEG26 SEG25 SEG24 SEG23 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17 SEG16 SEG15 SEG14 SEG13 SEG12 SEG11 SEG10 SEG9 SEG8 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
93. e SQIN level The signal from the RSSI pin of IC301 is used for S meter The electric field strength of the receive signal can be known before the SQIN voltage is input to the CPU and the scan stop speed is improved Narrow IC101 64pin IF_IN MIX_O IC301 IF System CF302 Narrow CF301 Wide R320 R319 R317 R318 D303 D302 Wide IC101 65pin AF Filter D A CONV D A CONV IC161 IC251 IC161 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 reference oscillator signal is divided at IC401 by a fixed counter to produce the 5 or 6 25kHz reference fre quency The voltage controlled oscillator VCO output signal is buffer amplified by Q410 then divided in IC401 by a dual module programmable counter The divided signal is com pared in phase with the 5 or 6 25kHz reference signal in the phase comparator in IC401 The output signal from the phase comparator is filtered through a low pass filter and passed to the VCO to control the oscillator frequency See Fig 6 VCO The operating frequency is generated b
94. ge absorption PTT D5 Diode Surge absorption SQC D6 Diode Surge absorption PKS D31 Diode Reverse connection protection D32 Poly switch Current protection D61 62 Diode Over voltage detection D201 Diode OR gate MIC mute AGC D202 Diode AGC D251 Diode Limiter D301 Diode Detection D302 303 Diode IF switch Wide Narrow D351 354 Varicap RF BPF tuning D401 Diode Ripple filter D402 Diode Voltage dropped D403 404 Varicap RX VCO D405 406 Varicap TX VCO D407 Varicap Modulation D408 Diode Lipple filter D409 Diode RF switch TX RX D501 502 Diode Temperature compensation D503 Diode Voltage protection D602 603 Diode ANT switch D605 Diode ANT switch D606 607 Diode APC voltage detect D608 Diode Temperature compensation COMPONENTS DESCRIPTION TM 271A 271E 10 PARTS LIST New Parts indicates safety critical components Parts without Parts No are not supplied Les articles non mentionnes dans le Parts No ne sont pas fournis Teile ohne Parts No werden nicht geliefert L Scandinavia K USA P Canada Y PX Far East Hawaii T England E Europe Y AAFES Europe X Australia M Other Areas K M2 M3 M4 TM 271A E TM 271E Ref No Address Parts No Description Desti nation New parts Ref No Address Parts No Description Desti nation New parts TM 271A E DISPLAY UNIT X54 3450 10 1 1B A
95. iption Desti nation New parts DISPLAY UNIT X54 3450 10 TX RX UNIT X57 685X XX R55 R92 1252 05 CHIP R 0 OHM J 1 16W VR1 R31 0646 05 VARIABLE RESISTOR D31 1SS355 DIODE IC3 LC75854W MOS IC IC3 PT6554LQ MOS IC Q6 KRC102S DIGITAL TRANSISTOR Q9 2SB1132 Q R TRANSISTOR Q10 KRA225S DIGITAL TRANSISTOR Q12 UMG3N TRANSISTOR S1 W02 3665 05 ENCODER C10 CK73GB1H102K CHIP C 1000PF K C13 20 CK73GB1H471K CHIP C 470PF K C28 CK73GB1H221K CHIP C 220PF K C29 CK73GB1H471K CHIP C 470PF K C30 CK73GB1H102K CHIP C 1000PF K C33 CK73GB1H102K CHIP C 1000PF K C34 CE04EQ1E331M ELECTRO 330UF 25WV C35 38 CK73GB1H102K CHIP C 1000PF K C39 40 CK73GB1C104K CHIP C 0 10UF K C41 C92 0795 05 CHIP TAN 22UF 10WV C42 CK73GB1H103K CHIP C 0 010UF K C43 45 C92 0795 05 CHIP TAN 22UF 10WV C49 50 CK73GB1H103K CHIP C 0 010UF K C51 C92 0589 05 CHIP TAN 47UF 6 3WV C52 53 CK73GB1H102K CHIP C 1000PF K C54 55 CK73GB1C104K CHIP C 0 10UF K C56 CK73GB1H102K CHIP C 1000PF K C61 CK73GB1H102K CHIP C 1000PF K C66 CK73GB1H102K CHIP C 1000PF K C82 CK73GB1H102K CHIP C 1000PF K C83 CK73GB1C104K CHIP C 0 10UF K C87 CC73GCH1H030C CHIP C 3 0PF C C88 89 CC73GCH1H040C CHIP C 4 0PF C C90 CC73GCH1H030C CHIP C 3 0PF C C97 98 CK73GB1H102K CHIP C 1000PF K C101 CK73GB1H102K CHIP C 1000PF K C102 CK73GB1C104K CHIP C 0 10UF K C104 CK73GB1C
96. nal 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 eliminate unwanted signals before it is am plified and FM detected in IC301 Item Rating Nominal center frequency 49 95MHz Pass bandwidth 5 0kHz or more at 3dB 35dB stop bandwidth 20 0kHz or less Ripple 1 0dB or less Insertion loss 5 0dB or less Guaranteed attenuation 80dB or more at fo 1MHz Spurious 40dB or more Terminal impedance 350 5 5pF Table 1 Crystal filter L71 0620 05 XF351 Item Rating Nominal center frequency 450kHz 6dB bandwidth 6 0kHz or more 50dB bandwidth 12 5kHz or less Ripple 2 0dB or less Insertion loss 6 0dB or less Guaranteed attenuation 35 0dB or more within fo 100kHz Terminal impedance 2 0k Table 2 Ceramic filter L72 0993 05 CF301 Item Rating Nominal center frequency 450kHz 6dB bandwidth 4 5kHz or more 50dB bandwidth 10 0kHz or less Ripple 2 0dB or less Insertion loss 6 0dB or less Guaranteed attenuation 60 0dB or more within fo 100kHz Terminal impedance 2 0k Table 3 Ceramic filter L72 0999 05 CF302 ANT L357 356 D353 354 BPF Q353 RF AMP Q351 IF AMP IC161 D A CONVERTER Q352 MIX XF351 MCF D602
97. nd key backlight LEDs The brightness function is controlled by the switch Q12 The LCD driver IC3 and CPU IC101 communicate through the CE CL DI DO lines See Fig 12 Key Matrix Circuit The TM 271 front panel has function keys Each of them is connected to a cross point of a matrix of the KI1 to KI3 and KSI to KS2 ports of the LCD 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 to the D A converter IC161 The DTMF signal is output from DTMF pin of the CPU and summed with a MIC signal by the summing amplifier IC203 and the resulting signal goes to the D A converter IC161 The D A converter IC161 adjusts the MOD level and the balance between the MOD and CTCSS DCS levels Part of a CTCSS DCS signal is summed with MOD and the resulting signal goes to the VCOMOD pin of the VCO This signal is applied to a varicap diode in the VCO for direct FM modula tion IC3 LCD driver KI1 KI2 KI3 KS2 KS1 FUNC REV CALL VFO MR MHz Encoder X401 TCXO IC161 D A VCO IC203 SUM AMP IC203 SUM AMP IC401 PLL TCXO MOD VCO MOD Amp
98. on Desti nation New parts Ref No Address Parts No Description Desti nation New parts TX RX UNIT X57 685X XX R161 RK73GB1J122J CHIP R 1 2K J 1 16W R162 RK73GB1J152J CHIP R 1 5K J 1 16W R164 166 RK73GB1J102J CHIP R 1 0K J 1 16W R200 RK73GB1J681J CHIP R 680 J 1 16W R203 RK73GB1J104J CHIP R 100K J 1 16W R204 RK73GB1J103J CHIP R 10K J 1 16W E R204 RK73GB1J183J CHIP R 18K J 1 16W K M2 M3 R204 RK73GB1J183J CHIP R 18K J 1 16W M4 R205 RK73GB1J821J CHIP R 820 J 1 16W R206 RK73GB1J101J CHIP R 100 J 1 16W R207 RK73GB1J105J CHIP R 1 0M J 1 16W E R207 RK73GB1J754J CHIP R 750K J 1 16W K M2 M3 R207 RK73GB1J754J CHIP R 750K J 1 16W M4 R208 RK73GB1J152J CHIP R 1 5K J 1 16W R209 RK73GB1J244J CHIP R 240K J 1 16W R210 RK73GB1J183J CHIP R 18K J 1 16W R211 212 RK73GB1J823J CHIP R 82K J 1 16W R213 RK73GB1J334J CHIP R 330K J 1 16W R214 215 RK73GB1J683J CHIP R 68K J 1 16W R216 RK73GB1J274J CHIP R 270K J 1 16W R217 RK73GB1J224J CHIP R 220K J 1 16W R218 RK73GB1J823J CHIP R 82K J 1 16W R219 RK73GB1J124J CHIP R 120K J 1 16W R220 221 RK73GH1J153D CHIP R 15K D 1 16W R222 RK73GB1J103J CHIP R 10K J 1 16W R224 RK73GB1J561J CHIP R 560 J 1 16W R225 RK73GB1J154J CHIP R 150K J 1 16W R226 RK73GB1J104J CHIP R 100K J 1 16W R227 RK73GB1J223J CHIP R 22K J 1 16W R228 RK73GB1J103J CHIP R 10K J 1 16W R2
99. p C304 330p 1 2 3 4 VCC 5 6 7 VEE R247 120k R248 5 6K C249 4 7u6 3 2SC2412K Q251 FB R63 0 D62 MA2S077 1 NC 2 SUB 3 GND 4 VOUT 5 VCC IC34 BD4732G 1 NC 2 SUB 3 GND 4 VOUT 5 VCC J1 F1 FB C282 330u25 2SC5488 Q351 R355 470 C355 18p C354 4 5p C356 3p R358 220 R361 180 C367 150p R363 330k C369 3p L354 50n L355 50n D351 HVC376B C368 27p R367 100 C373 6p C374 27p D352 HVC376B 3SK318 Q352 G1 D S G2 3SK318 Q353 G1 D S G2 R372 47k R374 27k L356 50n C382 27p C386 36p L357 35 5n D353 HVC376B D354 HVC376B C388 7p C390 9p C391 16p C471 10p S1 W02 3665 05 C128 1000p R126 47k L423 R114 47k 5M D407 1SV278 IC202 BA10358FV 1 2 3 4 5 6 7 8 VCC 2SK1830 Q354 C385 8p C381 4 5p 2SK3019 Q252 2SK3019 Q253 PD55003TR Q503 C544 15p C543 15p KEC SPLATTER FILTER 8TC CPU80 FM DEMODULATION OR GATE W NI EVOL1 TP 5C 8TC RX VCO TX VCO CV VOTAGE DROPPED CHARGE PUMP MIC AMP IDC TCXO CURRENT PROTECTION IDC AGC BUFFER AMP BUFFER AMP TEMPERATURE COMPENSATION MIC CK CPU54 TEMPERATURE COMPENSATION DT CPU53 5M AUDIO FILTER
100. ter 155 10 155 05 High 173 90 173 95 Max Deviation Narrow Center N icon appear 155 10 155 05 CTCSS Fine Deviation Low CT icon appear 136 10 136 05 CTCSS 88 5Hz Center 155 10 155 05 High 173 90 173 95 CTCSS Fine Deviation Narrow Center CT and N icon appear 155 10 155 05 DCS Fine Deviation Low DCS icon appear 136 10 136 05 DCS 023N Center 155 10 155 05 High 173 90 173 95 DCS Fine Deviation Narrow Center DCS and N icons appear 155 10 155 05 DTMF Fine Deviation Center 155 10 155 05 DTMF 9 DTMF Fine Deviation Narrow Center N icon appear 155 10 155 05 Band Pass Tuning Low BUSY icon appear 136 10 136 05 Center 155 10 155 05 High 173 90 173 95 Squelch Tight Low 136 10 136 05 Center 146 10 146 05 High 173 90 173 95 Squelch Tight Narrow Center N icon appear 146 10 146 05 Squelch Open Low 136 10 136 05 Center 146 10 146 05 High 173 90 173 95 Squelch Open Narrow Center N icon appear 146 10 146 05 S Meter S1 Level Center 146 10 146 05 S Meter Full Level Center 146 10 146 05 ADJUSTMENT Table 1 Adjustment items display and test frequency list TM 271A 271E 22 Test Equipment Required for Alignment Test Equipment Major Specifications 1 Standard Signal Generator Frequency Range 136 to 175MHz SSG Modulation Frequency modulation and e
101. ter IC251 These signals are always 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 simultaneous receive mode and transmit mode traffic during packet communications only during 1200bps The signal is output from pin 29 of IC101 to the data terminal The logic is as shown in the table below SQC terminal output L SQ CLOSE CN2 H SQ BUSY IC204 Analog switch IC201 202 MIC amp IC203 Sum amp IC205 Analog switch IC251 AF filter 76 75 IC101 CPU 1200bps 9600bps VCO TCXO D A converter D A converter Q252 Mute SW D6 D5 PKS CPU pin 30 SQC CPU pin 29 PKD PR9 PR1 PKS SQC CN2 CIRCUIT DESCRIPTION Fog 17 Data terminal and peripheral circuits TM 271A 271E 8 SEMICONDUCTOR DATA Terminal Function Pin No Name I O Function 1 TONE O CTCSS DCS Clone output 2 DTMF O DTMF BEEP 1750Hz output 3 PLLE O PLL IC chip select 4 5 NC I 6 GND GND 7 CNVSS 8 EVLLD O 9 BSHIFT O Beat shift 10 RESET Reset 11 XOUT X tal 8MHz 12 VSS GND 13 XI
102. the CPU VDD and reset voltage detect IC IC34 IC34 will generate signal RESET in to the reset terminal on the CPU IC101 to carry out a power ON reset If DC power is less than about 9 5V the radio is unable to power on When the DC power voltage deceases from normal volt age the INT voltage detector IC IC35 will set to high on CPU port 18 INT if B line will became less than about 9 5V Then 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 IC34 RST SBC IGN R77 R76 R39 R40 INT 5M BATT IC101 CPU POWER SW POWER RESET 5M IC35 INT SB IGN Fig 15 Decode Fig 16 Power supply circuit CIRCUIT DESCRIPTION Data Terminal and Peripheral Circuits CN2 data terminal is the data communications terminal on the TX RX PCB It handles transmission control data in put output and squelch signals There are two data communications modes 9600bps mode and 1200bps mode Unlike with 1200bps AFSK with this type of high speed modulation frequency modulation is carried out after the digital base band sign
103. tment ADJUSTMENT If normal power is not obtained please follow the step below Open the shielding cover upper and screw 3 locations around ANT pin 1 Switch off the transceiver Impedance of Final FET Q504 and Drive FET Q503 can be measured easily using DVM mode Normal condition Gate 20k 50k Drain 1M 2M The above impedance values are rough estimations 2 Switch on the transceiver Check the voltage at F501 out put point The voltage is around 13 8V in receiving condition The voltage will be 12 6V in transmitting condition If found 0V at this point then F501 is broken 3 Remove R516 4 Connect 50 load at the ANT location Transmit and check current drain at High power mode If the current drain is less than 1A then Final FET is bro ken If the current drain is less than 5 0A short the Drive FET gate to ground and check the current drain If the current drain is not 0 1A less than the original value then the Drive FET is broken 5 Check input power level at Drive FET gate location Connect the wire to RF location Transmit and check for power to be within the range of 0 3W 0 6W If power found is less than 0 3W check the circuit before the Drive FET 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
104. xternal modulation Output 127dBm 0 1 V to greater than 7dBm 100mV 2 Power Meter Input Impedance 50 Operation Frequency 136 to 175MHz or more Measurement Capability Vicinity of 100W 3 Deviation Meter Frequency Range 136 to 175MHz 4 Digital Volt Meter Measuring Range 1 to 20V DC DVM Accuracy High input impedance for minimum circuit loading 5 Oscilloscope DC through 30MHz 6 High Sensitivity Frequency Range 10Hz to 1000MHz Frequency Counter Frequency Stability 0 2ppm 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 8 Dummy Load Approx 8 10W or more 12 Regulated Power Supply 13 8V approx 20A adjustable from 9 to 17V Useful if ammeter requipped 13 Spectrum Analyzer Center frequency 50KHz to 1000MHz 14 Tracking Generator Output Voltage 100mV or more Tuning cable E30 3383 05 Adapter cable E30 3383 05 is required for injecting an audio if adjustment mode is used MIC connector Front view Test cable for microphone input E30 3360 08 1 BLC 2 PSB 3 E 4 PTT 5 ME 6 MIC 7 HOOK 8 CM ADJUSTMENT Lead wire MIC Shield wire 3 2 4 5 6 7 8 3 1 2 4 5 6 7 8 1 GREEN RED BLACK BLUE S
105. y Q406 in transmit mode and Q405 in receive mode The oscillator frequency is controlled by applying the VCO control voltage obtained from the phase comparator to the varactor diodes D405 and D406 in transmit mode and D403 and D404 in receive mode The TX RX pin is set high in receive mode causing Q408 and Q407 to turn Q406 off and turn Q405 on The TX RX pin is set low in transmit mode The outputs from Q405 and Q406 are amplified by Q410 and sent to the RF amplifiers See Fig 6 D405 406 Q406 TX VCO Q410 BUFF AMP D403 404 Q405 RX VCO Q407 408 T R SW Charge pump LPF Phase comparator 1 M 1 N 5kHz 6 25kHz 5kHz 6 25kHz REF OSC 16 8MHz PLL DATA IC401 PLL IC Q404 AMP RF amplifiers Q402 403 TX RX CPU Fig 6 PLL circuit CIRCUIT DESCRIPTION TM 271A 271E 4 Unlock Circuit During reception the 8RC signal goes high the 8TC signal goes low and Q34 turns on Q33 turns on and a voltage is applied to 8R During transmission the 8RC signal goes low the 8TC signal goes high and Q36 turns on Q35 turns on and a voltage is applied to 8T The CPU monitors the PLL IC401 LD signal directly When the PLL is unlocked during transmission the PLL LD signal goes low The CPU detects this signal and makes the 8TC signal low When the 8TC signal goes low no voltage is applied to 8T and no signal is transmitted See Fig 7 IC101 CPU Q34 SW Q33 SW IC401 PLL Q

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