Icom IC-4088E Service Manual Download Page 21

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SECTION 9

BOARD LAYOUTS

9-1 MAIN UNIT

9 - 1

C377

J303

TEST

S305

J302

B5918D

SP +

J301

R406

S304

J300

C354

C364

J300

C347

R377

R381

R363

R357

R373

C344

C335

C339

IC304

R378

C346

R384

R392

C361

R374

R366

R358

C389

C334

R356

R348

R346

C336

R359

R344

C329

C332

R361

R365

R388

C351

Q313

C348

C328

Q306

Q307

C324

R394

C317

R330

C340

C304

R308

R307

C390

C315

C384

R409

R417

R389

R419

C357

R399

C375

C333

R386

C376

C360

R402

C379

C380

R400

C369

C372

C366

R393

R387

Q317

R426

Q318

Q309

Q310

R420

D309

D310

R425

D313

D317

R328

R300

R301

R418

R331

C312

C319

C323

C320

R332

R375

C314

R362

Q304

R347

Q303

D301

C343

R376

C345

Q314

Q315

D305

C363

R395

C359

C330

R345

C327

R329

R382

C367

C356

R385

C358

R396

R383

IC305

IC300

IC303

IC302

C331

R360

R423

C337

W300

C373

R397

D308

Q312

R368

J300
to the RF unit J2

UNLK

ATA

PLSTB

ASTB

GND

SHIFT

T+3

+3V

MTX-00_PSC

VCC

GND

MOD

R+3

SQLIN

SENS

Summary of Contents for IC-4088E

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

Page 2: ......

Page 3: ...POWER SUPPLY CIRCUITS 4 3 4 5 PORT ALLOCATIONS 4 3 SECTION 5 ADJUSTMENT PROCEDURES 5 1 PREPARATION 5 1 5 2 ADJUSTMENT 5 2 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 1 11 2 ...

Page 4: ...MITTER Output power 10 mW Modulation system Variable reactance frequency modulation Max frequency deviation 5 0 kHz Spurious emissions 0 25 µW Adjacent channel power More than 47 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 dB SINAD 0 2 µV 14 dBµ Adjacen...

Page 5: ...500 434 1750 434 2000 Channel No Frequency MHz Channel No Frequency MHz Channel No Frequency MHz 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 434 2250 434 2500 434 2750 434 3000 434 3250 434 3500 434 3750 434 4000 434 4250 434 4500 434 4750 434 5000 434 5250 434 5500 434 5750 434 6000 434 6250 434 6500 434 6750 434 7000 434 7250 434 7500 434 7750 1 2 3 4 5 6 7 8 9 10 11 12 ...

Page 6: ...µPD78F9418AGK Audio amplifier IC305 NJM2070 T 3 Regulator Q308 2SB798 TOP VIEW BOTTOM VIEW 1st mixer Q2 2SC4226 PLL IC IC2 TB31202FN 2nd IF filter Fl3 CFWM450E 1st IF amplifier Q3 2SC4215 FM IF IC IC1 TA31136FN Reference oscillator X2 CR 633A 21 25 MHz VCO circuit RF amplifier Q1 2SC5194 1st IF filter Fl2 FL 298 TOP VIEW BOTTOM 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 unitin the direction of the arrow ...

Page 8: ...F amplifier Q3 then applied to the 2nd mixer circuit IC1 pin 16 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 ...

Page 9: ...e 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 amplifier circuit amplifies the VCO oscillating signal to the output power level The amplified transmit signal is passed through the antenna switching circuit D1 and low pass filter and is then applied to the antenna The modulated transmit signal ...

Page 10: ...ort for the test mode switch Outputs the clock signal to the EEP ROM MAIN unit IC300 Outputs data signals to the EEPROM 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 strobe signals for the PLL IC RF unit IC2 Outputs the clock signal to the PLL IC RF unit IC2 Outputs data signals to the PLL IC RF unit IC2 2...

Page 11: ...follow Reference frequecy adjustment Displayed Output power adjustment Displayed FM deviation adjustment Displayed CTCSS adjustment Displayed Squelch adjustment Displayed 5 1 EQUIPMENT DC power supply RF power meter terminated type Frequency counter SECTION 5 ADJUSTMENT PROCEDURES 5 1 PREPARATION When adjusting IC 4088E HM 75A OPTIONAL SPEAKER MICROPHONE is required All adjustment items must be pr...

Page 12: ... Set group No OFF Transmitting Operating channel Ch 35 Set group No 01 Transmitting Operating channel Ch 35 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 UP DN UP DN UP DN UP DN A 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 ...

Page 13: ...5 3 TEST J1 RF GND J1 RF test port ENTERING THE ADJUSTMENT MODE q Turn the transceiver power OFF w While connecting the TEST to GND then turn power ON ...

Page 14: ...030005120 S RESISTOR ERJ2GEJ 102 X 1 kΩ R368 7030007340 S RESISTOR ERJ2GEJ 153 X 15 kΩ R369 7030007570 S RESISTOR ERJ2GEJ 122X 1 2 kΩ R373 7030005080 S RESISTOR ERJ2GEJ 823 X 82 kΩ R374 7030009140 S RESISTOR ERJ2GEJ 272 X 2 7 kΩ R375 7030007310 S RESISTOR ERJ2GEJ 155 X 1 5 MΩ R376 7030007570 S RESISTOR ERJ2GEJ 122X 1 2 kΩ R377 7030007340 S RESISTOR ERJ2GEJ 153 X 15 kΩ R378 7030005230 S RESISTOR ER...

Page 15: ...0494TAY DS301 5040002230 S LED CL 200YG C TS MC300 7700002160 MICROPHON KUC3523 040245 S304 2260001900 SWITCH SW 149 SKHLLD W300 7030010040 S JUMPER ERJ2GE JPW W301 7030010040 S JUMPER ERJ2GE JPW W302 7120000470 JUMPER ERDS2T0 W304 7030010040 S JUMPER ERJ2GE JPW W307 7030010040 S JUMPER ERJ2GE JPW S Surface mount MAIN UNIT MAIN UNIT EP1 0910055934 PCB B 5918D EP300 6910012350 S BEAD MMZ1608Y 102BT...

Page 16: ...H 1H 080D T C7 4030006980 S CERAMIC C1608 CH 1H 070D T C8 4030007050 S CERAMIC C1608 CH 1H 220J T C9 4030006970 S CERAMIC C1608 CH 1H 060D T C10 4030006980 S CERAMIC C1608 CH 1H 070D T C11 4030006900 S CERAMIC C1608 JB 1H 103K T C12 4030017730 S CERAMIC ECJ0EB1E471K C13 4030017730 S CERAMIC ECJ0EB1E471K C14 4030007010 S CERAMIC C1608 CH 1H 100D T C15 4030017730 S CERAMIC ECJ0EB1E471K C16 403000701...

Page 17: ...W5 7030010040 S JUMPER ERJ2GE JPW W6 7030010040 S JUMPER ERJ2GE JPW W8 7030010040 S JUMPER ERJ2GE JPW W9 7030010040 S JUMPER ERJ2GE JPW EP2 6910013310 S BEAD MMZ1608D121B EP3 0910055942 PCB B 5919B 6 4 REF ORDER DESCRIPTION NO NO S Surface mount ...

Page 18: ...1 MP19 8930045370 2045 C terminal 2 MP20 8810008750 Screw PH B0 2x15 ZK BT 1 MP22 8930058310 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 REF NO ORDER NO DESCRIPTION QTY 7 1 CABINET PARTS CHASSIS PARTS REF NO ORDER NO DESCRIPTION QTY MAIN UNIT R406 7210001970 RV 2...

Page 19: ... MP7 C MP6 C MP8 C MP4 C MP3 C MP36 C MP33 C MP32 C MP32 C MP20 C MP2 C MP14 C MP12 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 ...

Page 20: ... Symbol 111 HAT1023R Symbol 1023 2SC4215 O Symbol QO 2SC4226 R25 Symbol R25 2SC4228 R44 Symbol R44 2SA1586 GR Symbol SG 2SB798 DK Symbol DK 2SC3356 Symbol R22 B E C E C B 2SB1132Q Symbol BA B E C S D G B E C 2SC4116GR Symbol LG 2SC4117GR Symbol DG E C B E C B E C B E C B E1 B1 B2 C1 E2 C2 B C E C E C B E 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 S D S MA2S111 Sy...

Page 21: ...315 C384 R409 R417 R389 R419 C357 R399 C375 C333 R386 C376 C360 R402 C379 C380 R400 C369 C372 C366 R393 R387 Q317 R426 Q318 Q309 Q310 R420 D309 D310 R425 D313 D317 R328 R300 R301 R418 R331 C312 C319 C323 C320 R332 R375 C314 R362 Q304 R347 Q303 D301 C343 R376 C345 Q314 Q315 D305 C363 R395 C359 C330 R345 C327 R329 R382 C367 C356 R385 C358 R396 R383 IC305 IC300 IC303 IC302 C331 R360 R423 C337 W300 C3...

Page 22: ...01 EP302 Q308 W304 R369 C325 C321 C316 W307 R340 R333 R334 IC301 SP SP MC300 R335 R338 R327 C313 C326 D303 D304 C352 R421 R350 C338 R343 DS301 C365 R413 R412 C300 C301 R305 R424 C388 C387 C386 C385 R416 R415 D307 D306 D302 Q305 R422 C349 R403 R391 C371 C378 R401 R390 C362 C382 C381 W301 Q302 Q316 Q311 ...

Page 23: ...R27 C43 C42 R26 R29 R33 C46 C47 R45 C69 D12 C91 R79 R86 R49 D11 R51 R48 C76 D10 R87 C77 R50 C92 R66 C102 R80 R69 R67 R70 C54 R36 C74 C50 R39 C55 L21 D9 L23 C56 C52 C51 C60 C104 R38 L20 R35 R68 C59 W4 R40 C58 D8 L22 C57 C53 R37 Q8 L18 R41 L19 C101 Q12 IC3 Q13 Q11 Q10 Q7 Q9 R78 C98 C71 C70 X2 R30 R28 C85 X1 J1 B5919B FI3 FI2 ...

Page 24: ...8 R8 C23 C86 R64 C87 R34 C45 IC1 R9 R10 C48 C24 Q3 L12 C26 R11 L10 C25 C6 C7 L11 C27 R14 C29 Q4 R4 R77 C22 W9 L9 R6 C21 J2 Q2 D5 C33 R17 L13 C32 C31 R12 L14 R85 R84 R82 C36 C18 C20 C19 C30 Q5 C35 R83 R19 L15 C38 R18 Q6 C73 L16 L17 EP2 IC2 C63 J2 to the MAIN unit J300 1 10 20 11 UNLK CK DATA PLSTB DASTB DACK GND SHIFT T 3 T 3 3V MTX 00_PSC VCC GND GND MOD AF R 3 SQLIN SENS ...

Page 25: ...317 MA2S111 VCC SENS 3V Q302 DTA114EU C3V TEMP SENS C3V TEMP HVIN VIN RESET RXC TXC BPON CHGC AF REG AFON AFV AFV MICIN Q307 2SA1362 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 PD78F9418AGK 9EU D309 D310 D313 MA2S111 VCO3 PSC...

Page 26: ...N 41 RXINO 42 LIMINO 43 LININ 44 TXOUT 45 LIMLV 46 LIMBS 47 DBMIN 48 BPFOUT IC303 R1121N301B 1 VOUT 2 GND 3 VDD 4 CE 5 NC IC300 BR24C02FV W 1 A0 2 A1 3 A2 4 VSS 5 SDA 6 SCL 7 WP 8 VCC DS300 L2 0494TAY 1 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 C383 0 1 C301 24 P C300 24 P C303 0 01 C313 100 P C389 0 1 C335 220 ...

Page 27: ... R14 1 k D12 HVC376B Q12 2SJ144 GR R70 NTCG16 3NH 681KT R41 33 k R40 180 R38 33 k R37 680 R39 33 k R35 220 C58 470 P C57 12 P C56 12 P C55 4 P C53 2 P C52 2 P C51 0 5 P C50 1 5 P C54 470 P C74 470 P C104 470 P C64 0 001 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 ...

Page 28: ......

Page 29: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan S 13910IZ C1 2002 Icom Inc ...

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