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SERVICE

MANUAL

PMR446 FM TRANSCEIVER

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Summary of Contents for IC-4088SR

Page 1: ...SERVICE MANUAL PMR446 FM TRANSCEIVER ...

Page 2: ...rovided on the inside back cover for your convenience 1 Make sure a problem is internal before disassembling the transceiver 2 DO NOT open the transceiver until the transceiver is disconnected from its power source 3 DO NOT force any of the variable components Turn them slowly and smoothly 4 DO NOT short any circuits or electronic parts An insulated turning tool MUST be used for all adjustments 5 ...

Page 3: ...PLY CIRCUITS 4 3 4 5 PORT ALLOCATIONS 4 3 SECTION 5 ADJUSTMENT PROCEDURES 5 1 PREPARATION 5 1 5 2 ADJUSTMENT MODE ADJUSTMENTS 5 3 SECTION 6 PARTS LIST SECTION 7 MECHANICAL PARTS AND DISASSEMBLY 7 1 CABINET PARTS 7 1 7 2 ACCESSORIES 7 1 SECTION 8 SEMI CONDUCTOR INFORMATION SECTION 9 BOARD LAYOUTS 9 1 MAIN UNIT 9 1 9 2 RF UNIT 9 3 SECTION 10 BLOCK DIAGRAM SECTION 11 VOLTAGE DIAGRAM 11 1 MAIN UNIT 11...

Page 4: ...0 g Approx TRANSMITTER Output power Less than 500 mW ERP Modulation system Variable reactance frequency modulation Max frequency deviation 2 5 kHz Spurious emissions 0 25 µW Adjacent channel power More than 60 dB External microphone connector 3 conductor 2 5 d mm 2 2 kΩ RECEIVER Receiving system Double conversion superheterodyne system Intermediate frequency 1st 21 7 MHz 2nd 450 kHz Sensitivity 12...

Page 5: ...hannel No 1 2 3 4 5 6 7 8 9 10 11 12 13 Frequency Hz 67 0 71 9 74 4 77 0 79 7 82 5 85 4 88 5 91 5 94 8 97 4 100 0 103 5 Channel No 14 15 16 17 18 19 20 21 22 23 24 25 26 Frequency Hz 107 2 110 9 114 8 118 8 123 0 127 3 131 8 136 5 141 3 146 2 151 4 156 7 162 2 Channel No 27 28 29 30 21 32 33 34 35 36 37 38 Frequency Hz 167 9 173 8 179 9 186 2 192 8 203 5 210 7 218 1 225 7 233 6 241 8 250 3 OFF ...

Page 6: ...PD78F9407AGK Audio amplifier IC305 NJM2070 T 3 Regulator Q308 2SB798 TOP VIEW BOTTOM VIEW 2nd IF filter Fl3 CFWM450G Reference oscillator X2 CR 669 21 25 MHz VCO circuit RF amplifier Q1 2SC4228 BOTTOM VIEW 1st IF amplifier Q3 2SC4215 1st IF amplifier Fl2 FL 297 1st mixer Q2 2SK320 PLL IC IC2 UPD3140GS FM IF IC IC1 TA31136FN TOP VIEW ...

Page 7: ...ew A and 5 screws B 2 Remove the rear panel in the direction of the arrow REMOVING THE RF UNIT 1 Unscrew 2 screws H 2 Unsolder 2 points I and remove the RF unit REMOVING THE MAIN UNIT 1 Remove 1 knob C unscrew 1 nut D and then remove 1 ring E 2 Unscrew 1 screw F 3 Unsolder 2 points G and remove the MAIN unit in the direction of the arrow ...

Page 8: ... 4 1 4 2ND MIXER AND DEMODULATOR CIRCUITS RF UNIT The 2nd mixer circuit converts the 1st IF signal to a 2nd IF signal A double conversion superheterodyne system which converts receive signals twice improves the image rejection ratio and obtains stable receiver gain The 1st IF signal from the IF amplifier Q3 is applied to the 2nd mixer section in the FM IF IC IC1 pin 16 and is mixed with the 2nd LO...

Page 9: ... unit are applied to the modulation circuit D8 D9 to modu late transmit signals at the VCO circuit Q8 The modulated signal is applied to the drive amplifier circuit 4 2 3 DRIVE POWER AMPLIFIER CIRCUITS RF UNIT The drive power amplifier circuit amplifies the VCO oscillat ing signal to the output power level The modulated transmit signal is amplified at the drive amplifiers Q5 Q6 after being amplifi...

Page 10: ...mode switch Outputs the clock signal to the EEP ROM MAIN unit IC300 Outputs the data signals to the EEP ROM MAIN unit IC300 Input port for the control signal of the tone detection Outputs the shift control signal to the PLL IC RF unit IC2 Outputs the strobe signals to the PLL IC RF unit IC2 Outputs the clock signal to the PLL IC RF unit IC2 Outputs the data signals to the PLL IC RF unit IC2 27 31 ...

Page 11: ... range 300 600 MHz Impedance 50 Ω SWR Less than 1 2 1 Frequency range 0 1 600 MHz Frequency accuracy 1 ppm or better Sensitivity 100 mV or better EQUIPMENT FM deviation meter Standard signal generator SSG AC millivoltmeter Audio generator GRADE AND RANGE Frequency range 30 600 MHz Measuring range 0 to 10 kH Frequency range 0 1 600 MHz Output level 0 1 µV 32 mV 127 to 17 dBm Measuring range 10 mV 1...

Page 12: ... as follow Reference frequency adjustment Displayed Output power adjustment Displayed FM deviation adjustment Displayed CTCSS adjustment Displayed Squelch adjustment Displayed A B TEST J1 to RF unit J1 DC power supply 4 5 V 1 0 A Frequency counter FM deviation meter CAUTION DO NOT transmit while the SSG is connected to the antenna RF power meter 50 Ω 1 1000 mW to DC IN Standard signal generator Lo...

Page 13: ...FF Transmitting Operating channel Ch 1 Set group No 24 Transmitting Operating channel Ch 1 Connect an SSG to J1 on the RF unit and set as Level 0 13 µV 125 dBm Modulation OFF Receiving Set an SSG as Level OFF Receiving Verify Loosely couple a fre quency counter to the antenna Connect an RF power meter to the RF test port J1 Connect an FM devia tion meter to the RF test port J1 speaker 5 2 ADJUSTME...

Page 14: ...OR ERJ2GEJ 155 X 1 5 MΩ T R376 7030007570 S RESISTOR ERJ2GEJ 122X 1 2 kΩ T R377 7030007340 S RESISTOR ERJ2GEJ 153 X 15 kΩ B R378 7030005230 S RESISTOR ERJ2GEJ 334 X 330 kΩ T R379 7030004990 S RESISTOR ERJ2GEJ 221 X 220 Ω B R381 7030005600 S RESISTOR ERJ2GEJ 273 X 27 kΩ T R382 7030008010 S RESISTOR ERJ2GEJ 123 X 12 kΩ T R383 7030005710 S RESISTOR ERJ2GEJ 121 X 120 Ω T R384 7030005090 S RESISTOR ERJ...

Page 15: ...002130 CONNECTOR 04 730A2 02BKA T J303 6450000130 CONNECTOR HSJ1102 01 540 T DS300 5030002520 LCD L2 0494TAY B DS301 5040002230 S LED CL 200YG C TS B MC300 7700002160 MICROPHON KUC3523 040245 B S304 2260001900 SWITCH SW 149 SKHLLD T W300 7030010040 S RESISTOR ERJ2GE JPW T W301 7030010040 S RESISTOR ERJ2GE JPW B W302 7120000470 JUMPER ERDS2T0 T S Surface mount 6 2 REF ORDER DESCRIPTION M NO NO M Mo...

Page 16: ...T T C13 4030017730 S CERAMIC ECJ0EB1E471K B C14 4030017570 S CERAMIC ECJ0EC1H040B T C15 4030017730 S CERAMIC ECJ0EB1E471K T C16 4030017640 S CERAMIC ECJ0EC1H150J B C18 4030016950 S CERAMIC ECJ0EB1A473K B C19 4030017730 S CERAMIC ECJ0EB1E471K B S Surface mount C20 4030017730 S CERAMIC ECJ0EB1E471K B C21 4030017630 S CERAMIC ECJ0EC1H120J B C22 4030017600 S CERAMIC ECJ0EC1H080C B C23 4030017460 S CER...

Page 17: ...ERJ2GE JPW B W7 7030003860 S RESISTOR ERJ3GE JPW V B W8 7030010040 S RESISTOR ERJ2GE JPW B EP1 0910056422 PCB B 5925B EP2 6910013310 S BEAD MMZ1608D121B B M Mounted side T Mounted on the Top side B Mounted on the Bottom side S Surface mount 6 4 REF ORDER DESCRIPTION M NO NO ...

Page 18: ...930058310 2605 DC cap 1 MP25 8830000550 Nut E 1 MP32 8810009560 Screw PH B0 2x6 ZK BT 5 MP33 8810008620 Screw PH B0 2x20 ZK BT 1 MP35 8930059600 2628 Mic rubber 1 MP36 8930059610 Sponge HC 1 SECTION 7 MECHANICAL PARTS AND DISASSEMBLY 7 1 Screw abbreviations B0 BT Self tapping PH Pan head ZK Black REF NO ORDER NO DESCRIPTION QTY 7 1 CABINET PARTS CHASSIS PARTS REF NO ORDER NO DESCRIPTION QTY MAIN U...

Page 19: ...2 C MP302 M MP303 M EP303 M DS300 M MP301 M MAIN Unit RF Unit MP1 C SP1 C MP22 C MP18 C MP35 C MP304 M MP17 C MP9 C MP13 C MP1 RF MP32 C MP5 C S304 M J302 M MC300 M R406 M J301 M J303 M MP11 C MP10 C MP19 C MP39 C EP1 C M L for IC 4088E M for IC 4088SR H for IC 4088S or IC 4088A NOTE See the marking when verifing short antenna type Antenna marking here Back side ...

Page 20: ...4228 R44 Symbol R44 2SA1586 GR Symbol SG 2SC3356 Symbol R22 B E C E C B B E C S D G B E C 2SC4116GR Symbol LG 2SC4117GR Symbol DG E C B E C B 2SC4228 R45 Symbol R45 E C B 2SC5108 Y Symbol MC E C B E1 B1 B2 C1 E2 C2 XP4601 Symbol 5C E1 B1 C2 C1 B2 E2 2SB798 DK Symbol DK B C E C 3SK320 Symbol U7 G G S D 2SB1132Q Symbol BA B C E B E C B E C B E C B E C B E C S S S G D D D D E C B E C B S D G B E C G ...

Page 21: ...347 D301 C328 Q303 R330 R362 Q304 C304 C330 R345 C327 R329 W300 C331 R360 C340 IC300 R423 C317 R394 Q307 C324 J300 C344 C348 D308 Q312 R382 R383 R373 C389 C364 J300 D318 R396 C367 R406 C356 C347 R374 R365 C361 R384 R392 IC305 C358 R385 S304 Q313 R388 R357 C335 C339 R366 R433 R378 C346 IC304 R358 R432 R361 C401 R381 C351 C337 C334 R308 R307 C390 C398 R431 R428 C329 C399 R430 C397 SP R301 R300 R332 ...

Page 22: ...C326 C313 R327 R334 C394 C321 C316 R333 R335 R338 R340 SP SP R364 C311 C395 C396 C400 R415 R416 C385 C386 C387 C388 R424 IC301 R414 C319 R410 R379 C350 Q308 C368 C392 C393 R411 R350 R427 C338 C365 EP304 C382 R403 C381 EP306 Q311 C371 EP308 Q302 W301 EP307 R343 DS301 C383 EP302 R413 R412 EP301 D307 D306 R304 C303 EP300 X300 R305 C301 C300 MC300 ...

Page 23: ... C120 R66 C98 R78 R32 C43 R27 C47 C46 R33 C85 X1 C88 C44 R65 C49 B5925B J1 C15 L7 C11 L6 C9 C10 D2 D4 C14 R3 R1 R2 Q1 C12 L5 D3 FI4 C39 Q10 C75 R83 D10 R49 D11 C76 R48 C60 C104 R38 C51 Q9 Q7 C54 L20 R35 L19 L18 C50 R39 C55 C52 R36 R67 W4 R40 C58 L22 D8 C56 C118 R50 C77 Q14 R82 Q11 R51 C74 C53 C57 R37 Q8 C106 R41 L23 D9 L21 ...

Page 24: ...73 D7 R46 C48 R10 R9 C24 C45 R34 IC1 Q2 R75 C113 C21 W8 J2 J2 R77 C22 L8 C13 R81 C16 L9 C20 R6 R7 R4 C112 C18 C99 R14 C29 C36 C28 L14 C122 R12 Q4 C30 C31 C32 C26 L11 C27 C7 L12 D1 C8 L4 C25 R11 L10 C6 FI2 C19 C117 C3 L3 C4 C2 C89 C90 L2 C5 C1 W7 R8 Q3 R64 C87 C86 C23 J2 to the MAIN unit J300 1 10 20 11 UNLK PLCK DATA PLSTB DASTB DACK GND SHIFT T 3 T 3 3V MTX 02_PSC VCC GND GND MOD AF R 3 SQLIN SEN...

Page 25: ...MP HVIN VIN RESET RXC TXC BPON CHGC AF REG AFON AFV AFV MICIN Q307 2SA1362 D318 RB551V Q306 2SC4116 IC305 NJM2070 Q311 2SC4213 RMUT Q316 2SJ144 PTTC MMUT PTTS Q317 DTC144EU Q310 DTA113ZU Q309 DTC114TU Q313 2SK1829 SCREMBLER Pre emphasis De emphasis MIC AMP TONE FIL CTCSS IDC AMP LPF MICIN AFOUT CPU IC301 UPD789407A D309 D310 D313 MA2S111 3 VCO3 PSC VCC Q10 2SA1586 Q11 2SC4116 D10 D11 MA2S111 2 PSC...

Page 26: ... S1 2 S2 3 S3 4 S4 5 S5 6 S6 7 S7 8 S8 9 S9 10 S10 11 S11 12 S12 13 S13 14 S14 15 C3 16 C2 17 C1 C381 470 P C375 470 P C357 470 P C355 0 0047 C383 0 1 C301 24 P C300 24 P C303 0 01 C313 100 P C389 0 1 C335 220 P C344 0 047 C339 220 P C349 0 001 C362 0 1 C378 0 1 C367 470 P C377 330 P C366 0 1 C372 0 1 C379 470 P C380 470 P C369 470 P C361 470 P C346 100 P C336 270 P C334 0 1 C329 47 P C332 0 001 C...

Page 27: ...P C55 1 5 P C53 2 P C52 2 P C51 0 5 P C50 2 P C54 470 P C74 470 P C104 470 P R36 47 k L21 27 nH C 88 1 C43 470 P C42 470 P C45 470 P C44 0 1 C48 0 047 C 87 0 1 C86 0 047 C46 22 P C47 68 P C23 0 001 C24 0 047 C63 470 P C62 0 047 C73 0 01 C72 0 001 C20 470 P C18 0 047 C15 470 P C13 470 P C12 470 P C25 470 P C36 470 P C38 470 P C34 470 P C122 3 P C29 0 001 C28 0 001 C99 0 001 D10 MA2S111 W4 W5 R21 68...

Page 28: ...ca Inc Glenwood Centre 150 6165 Highway 17 Delta B C V4K 5B8 Canada Phone 1 604 952 4266 Fax 1 604 952 0090 URL http www icomcanada com E mail info icomcanada com Icom Canada A B N 88 006 092 575 290 294 Albert Street Brunswick Victoria 3056 Australia Phone 61 03 9387 0666 Fax 61 03 9387 0022 URL http www icom net au E mail sales icom net au Icom Australia Pty Ltd 146A Harris Road East Tamaki Auck...

Page 29: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan S 13914IZ C1 q 2003 2004 Icom Inc ...

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