Icom IC-4088E Service Manual
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Icom IC-4088E Service Manual

Icom IC-4088E Service Manual

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SERVICE
MANUAL
LPD FM TRANSCEIVER

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Summary of Contents for Icom IC-4088E

  • Page 1 SERVICE MANUAL LPD FM TRANSCEIVER...
  • Page 2 INTRODUCTION This service manual describes the latest service information for the IC-4088E LPD FM TRANSCEIVER at the time of pub- lication. To upgrade quality, all electrical or mechanical parts and internal circuits are subject to change without notice or oblig- ation.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION SPECIFICATIONS SECTION INSIDE VIEWS SECTION DISASSEMBLY INSTRUCTIONS SECTION CIRCUIT DESCRIPITON RECEIVER CIRCUITS ........... . .4-1 TRANSMITTER CIRCUITS .
  • Page 4 SECTION 1 SPECIFICATIONS ‘ ‘ GENERAL • Number of channel : 69 channels (simplex; 433.075–434.775 MHz) • Type of emission : 16K0F3E (FM) • Freqency stability : ±2500 Hz (±5.7 ppm) • Freqency resolution : 25 kHz : 3 × AA (R6) dry, alkaline; or BP-202 (optionl battery pack) •...
  • Page 5 CHANNEL FREQUENCY LIST Channel No. Frequency (MHz) Channel No. Frequency (MHz) Channel No. Frequency (MHz) 433.0750 433.6500 434.2250 433.1000 433.6750 434.2500 433.1250 433.7000 434.2750 433.1500 433.7250 434.3000 433.1750 433.7500 434.3250 433.2000 433.7750 434.3500 433.2250 433.8000 434.3750 433.2500 433.8250 434.4000 433.2750 433.8500 434.4250 433.3000...
  • Page 6 SECTION 2 INSIDE VIEWS • MAIN UNIT TOP VIEW BOTTOM VIEW T+3 Regulator Audio amplifier (Q308: 2SB798) (IC305: NJM2070) R+3 Regulator (Q304: 2SA1586) EEPROM (IC300: BR24C02) (IC301: µPD78F9418AGK) +3 Regulator (IC303: R1121N301B) • RF UNIT TOP VIEW BOTTOM VIEW 2nd IF filter FM IF IC (Fl3: CFWM450E) (IC1: TA31136FN)

  • Page 7: Section 3 Disassembly Instructions

    SECTION 3 DISASSEMBLY INSTRUCTIONS • • REMOVING THE RF UNIT REMOVING THE REAR PANEL 1 Unscrew 1 screw A , and 5 screws B. 1 Unscrew 2 screws H. 2 Remove the rear panel in the direction of the arrow. 2 Unsolder 2 points I, and remove the RF unit.

  • Page 8: Receiver Circuits

    SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS 4-1-4 2ND MIXER AND DEMODULATOR CIRCUITS (RF UNIT) 4-1-1 ANTENNA SWITCHING CIRCUIT (RF UNIT) The 2nd mixer circuit converts the 1st IF signal to a 2nd IF Received signals from the antenna connector are passed signal.

  • Page 9: Transmitter Circuits

    4-1-6 SQUELCH CIRCUIT (RF AND MAIN UNITS) 4-2-3 DRIVE/POWER AMPLIFIER CIRCUITS (1) NOISE SQUELCH (RF UNIT) The noise squelch circuit cuts out AF signals when no RF The amplifier circuit amplifies the VCO oscillating signal to signals are received. By detecting noise components in the the output power level.

  • Page 10: Power Supply Circuits

    4-4 POWER SUPPLY CIRCUITS Port Description VOLTAGE LINE number name LINE DESCRIPTION Input port for the PLL unlock signal from the PLL IC (RF unit; IC2). UNLK The voltage from the connected battery or Low : During unlock. power supply from DC IN (J302). Input port for the PTT switch from the Common 3 V converted from the VCC line at the external mic jack (MAIN unit;...

  • Page 11: Section 5 Adjustment Procedures

    • Change the adjustment channel : IC-4088E’s [UP]/[DN] keys except [PTT] jack • Change the adjustment group : IC-4088E’s [MODE]+ [UP]/[DN] keys ADJUSTMENT ITEMS When entering adjustment mode, displayed adjustment items indicator on LCD as follow. • Reference frequecy adjustment : Displayed •...

  • Page 12: Adjustment

    5-2 ADJUSTMENT MODE ADJUSTMENTS The following adjustment must be performed at “ADJUSTMENT MODE”. ADJUSTMENT ADJUSTMENT CONDITION MEASUREMENT VALUE HM-75A’s KEY REFERENCE • Operating channel : Ch 35 Loosely couple a fre- [UP]/[DN] 433.925000 MHz FREQUENCY • Transmitting quency counter to the [Fr] antenna.
  • Page 13 RF test port ENTERING THE ADJUSTMENT MODE q Turn the transceiver power OFF. w While connecting the "TEST" to GND, then turn power ON. TEST 5 - 3...

  • Page 14: Section 6 Parts List

    SECTION 6 PARTS LIST [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION IC300 1130011230 S.IC BR24C02FV-WE2 R363 7030005720 S.RESISTOR ERJ2GEJ 563 X (56 kΩ) IC301 1140011170 S.IC µPD78F9418AGK-9EU R364 7030005050 S.RESISTOR ERJ2GEJ 103 X (10 kΩ) IC302 1110005820 S.IC R3112N281A-TR R365 7510001440 S.THERMISTOR NTCG16 3NH 221KT IC303...
  • Page 15 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION C329 4030017420 S.CERAMIC ECJ0EC1H470J 0910055934 PCB B-5918D C330 4030016930 S.CERAMIC ECJ0EB1A104K EP300 6910012350 S.BEAD MMZ1608Y 102BT C331 4030016930 S.CERAMIC ECJ0EB1A104K EP301 6910014690 S.BEAD MPZ1608S221A-T C332 4030017460 S.CERAMIC ECJ0EB1E102K EP302 6910014690 S.BEAD MPZ1608S221A-T C333 4030017730 S.CERAMIC ECJ0EB1E471K...
  • Page 16 [RF UNIT] [RF UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 6200005630 S.COIL ELJRE 5N6Z-F 4030017730 S.CERAMIC ECJ0EB1E471K 4030007010 S.CERAMIC C1608 CH 1H 100D-T 4030017340 S.CERAMIC ECJ0EC1H010B 7030005060 S.RESISTOR ERJ2GEJ 333 X (33 kΩ) 4030016950 S.CERAMIC ECJ0EB1A473K ERJ2GEJ 330 X (33 Ω) 7030007260 S.RESISTOR 4030017730 S.CERAMIC ECJ0EB1E471K ERJ2GEJ 470 X (47 Ω)
  • Page 17 [RF UNIT] ORDER DESCRIPTION 7030010040 S.JUMPER ERJ2GE-JPW 7030010040 S.JUMPER ERJ2GE-JPW 7030010040 S.JUMPER ERJ2GE-JPW 7030010040 S.JUMPER ERJ2GE-JPW 7030010040 S.JUMPER ERJ2GE-JPW 6910013310 S.BEAD MMZ1608D121B 0910055942 PCB B-5919B S.=Surface mount 6 - 4...

  • Page 18: Mechanical Parts And Disassembly

    SECTION 7 MECHANICAL PARTS AND DISASSEMBLY 7-2 ACCESSORIES 7-1 CABINET PARTS [CHASSIS PARTS] REF. NO. ORDER NO. QTY. REF. NO. ORDER NO. QTY. DESCRIPTION DESCRIPTION 8930045331 2405 Belt clip-1 2510001120 Speaker SDRS-3650P-008 3310003060 Antenna 2628 ANT 8210019410 2628 Front panel 8110007920 2628 Rear cover 8210019420 2628 Rear panel 8310054740 2628 Window plate...
  • Page 19 MP301 (M) EP1 (C) DS300 (M) MP302 (M) MP1 (RF) EP303 (M) MP20 (C) R406 (M) MP36 (C) J301 (M) MP32 (C) MP303 (M) MP7 (C) J303 (M) RF Unit MP33 (C) MP25 (C) S304 (M) MP15 (C) MP16 (C) MP304 (M) J302 (M) MP6 (C)
  • Page 20 SECTION 8 SEMI-CONDUCTOR INFORMATION • TRANSISTOR AND FET’S 2SA1362 GR 2SA1586 GR 2SB1132Q 2SB798 DK 2SC3356 (Symbol: AEG) (Symbol: SG) (Symbol: BA) (Symbol: DK) (Symbol: R22) 2SC4116GR 2SC4117GR 2SC4213 B 2SC4215 O 2SC4226 R25 (Symbol: LG) (Symbol: DG) (Symbol: AB) (Symbol: QO) (Symbol: R25) 2SC4228 R44...

  • Page 21: Section 9 Board Layouts

    SECTION 9 BOARD LAYOUTS 9-1 MAIN UNIT J300 to the RF unit J2 R396 J303 C364 C354 C347 J300 C343 R376 Q307 Q306 C361 C324 J300 R377 R384 R392 R394 R381 R363 R378 R373 R357 C348 C339 C346 C344 C335 C317 R330 D305...
  • Page 22 • BOTTOM VIEW R403 R405 R404 C378 Q316 C349 R391 C371 C374 C368 R349 R410 Q308 C341 R343 R422 W304 R369 D303 D304 C350 R414 R340 W307 C383 EP301 C325 R333 C326 R327 C313 R334 EP302 IC301 R304 C303 EP300 X300 C311 R364...

  • Page 23: Rf Unit

    9-2 RF UNIT • TOP VIEW B5919B C102 9 - 3...

  • Page 24: Bottom View

    • BOTTOM VIEW to the MAIN unit J300 C103 9 - 4...

  • Page 25: Block Diagram

    SECTION 10 BLOCK DIAGRAM ANTENNA FI3: CFWM450E FI2: FL-298 FI1: NSVS972 CDBC450CX24 1st.MIX CERAMIC XTAL TX/RX Q2: 2SC4226 Q3: 2SC4215 1st IF: 21.7MHz Q1: 2SC5194 TX/RX: 433.075 - 434.775MHz D1, D2, D3: MA2S077 2nd.Lo: D4: MA2S728 D6, D7: MA2S077 21.25MHz VCO3 VCO3 VCO3...

  • Page 26: Voltage Diagram

    SECTION 11 VOLTAGE DIAGRAM 11-1 MAIN UNIT R399 R403 *: EXT-PTT C375 C381 T: 2.30 470 P 470 P R: 3.10 R419 100 k Q309 R386 Q310 DTC114TU DTA113ZU CPU3V C357 R400 C376 C382 470 P 4.7 k 0.01 R387 DS301 4.7 k CL-200YG-C-TS...

  • Page 27: Rf Unit

    11-2 RF UNIT ANTENNA C: COMMON T: TX R: RX CFWM450E 470 P FL-298 NSVS972 82 k 1.5 k 27 nH 5.6 nH 12 nH 18 nH 17 nH 17 nH 15 nH 0.001 10 P 100 k 10 P 0.01 9210B-1-02R-T 2SC5194...
  • Page 29 S-13910IZ-C1 1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan © 2002 Icom Inc.

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