Icom IC-4008A Service Manual
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Icom IC-4008A Service Manual

Uhf fm transceiver/lpd fm transceiver
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SERVICE
MANUAL
UHF FM TRANSCEIVER
LPD FM TRANSCEIVER

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Summary of Contents for Icom IC-4008A

  • Page 1 SERVICE MANUAL UHF FM TRANSCEIVER LPD FM TRANSCEIVER...
  • Page 2 <SAMPLE ORDER> 0910049951 PCB B-5109B IC-4008A MAIN UNIT 5 pieces 8810009780 Screw PH BO M2x6 ZK IC-4008A Chassis 10 pieces Addresses are provided on the inside back cover for your convenience. REPAIR NOTES 1. Make sure a problem is internal before disassembling the transceiver.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION SPECIFICATIONS SECTION INSIDE VIEWS SECTION DISASEMBLY INSTRUCTION SECTION CIRCUIT DESCRIPTION RECEIVER CIRCUITS ........... . .4-1 TRANSMITER CIRCUITS .
  • Page 4 SECTION 1 SPECIFICATIONS [ITA], [ITA-1] [CSA], [CSA-1] Number of channels 69 channel (simplex; 433.075–434.775) Type of emission 16K0F3E Frequency stability ±2500 Hz (±5.7 ppm) Frequency resolution 25 kHz Power supply requirements AA(R6) dry, alkaline;or optional BP-202 (negative ground) Current drain less than 140 mA less than 500 mA Operating temperature range...
  • 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 VEIW BOTTOM VEIW Audio amplifier (IC9: NJM2070M) EEPROM T+3 Regurator (IC3: X24C01AS) (Q28: 2SB798) +3 Regurator (IC6: S-81230SG) (IC1: PD753036GK) R+3 Regurator (Q18: 2SA1586) • RF UNIT TOP VIEW BOTTOM VIEW FM IF IC (IC2: TA31136FN) Reference oscilletor (X1: CR-633 21.25 MHz)
  • Page 7 SECTION 3 DISASEMBLY INSTRUCTIONS • • REMOVING THE MAIN UNIT REMOVING THE REAR PANEL Unscrew 2 screws, Unscrew 1 screw , and 4 screws Remove the PTT rubber, Remove the rear panel in the direction of the arrow. Unsolder 2 points, , and remove the MAIN unit.

  • Page 8: Section 4 Circuit Description

    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: Transmiter 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 sig- The amplifier circuit amplifies the VCO oscillating signal to nals are received. By detecting noise components in the AF the output power level.

  • Page 10: Power Supply Circuits

    4-4 POWER SUPPLY CIRCUITS Port Description VOLTAGE LINE number name Outputs data signals to the PLL IC (RF LINE DESCRIPTION PLLDA unit; IC1). BATT The voltage from the connected battery pack. Outputs strobe signals for the PLL IC PLLST Common 3 V converted from the BATT line at (RF unit;...

  • Page 11: Section 5 Adjustment Procedures

    SECTION 5 ADJUSTMENT PROCEDURES 5-1 PREPARATION REQUIRED TEST EQUIPMENT EQUIPMENT GRADE AND RANGE EQUIPMENT GRADE AND RANGE Output voltage : 4.5 V DC Frequency range : 300–3000 Hz DC power supply Audio generator Current capacity : 1 A or more Measuring range : 1–500 mV Measuring range...

  • Page 12: Adjustment

    5-2 ADJUSTMENT ADJUSTMENT MEASUREMENT POINT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION UNIT ADJUST REFERENCE • Operating channel : Ch 35 Loosely couple a fre- 433.925000 MHz FREQUENCY • Transmitting panel quency counter to the antenna. OUTPUT • Operating channel : Ch 35 Connect an RF power 9 mW [ITA/–1] R206...
  • Page 13 Reference frequency adjustment FM deviati R206 Output power adjustment RF test por TEST ENTERING THE ADJUSTMENT MODE q Turn the transceiver power OFF. w While connecting the "TEST" to GND, then turn power ON. 5 - 3...

  • Page 14: Section 6 Parts List

    SECTION 6 PARTS LIST [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 1140006881 S.IC µPD753036GK-524-BE9 7030003740 S.RESISTOR ERJ3GEYJ 334 V (330 kΩ) 1110002820 S.IC NJM2100M-T1 7030003820 S.RESISTOR ERJ3GEYJ 155 V (1.5 MΩ) 1140004450 S.IC X24C01AS-3.0T6 7030003450 S.RESISTOR ERJ3GEYJ 122 V (1.2 kΩ) ERJ3GEYJ 121 V (120 Ω) 1110004710 S.IC S-80928ANMP-DDR-T2...
  • Page 15 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 4510004630 S.ELECTROLYTIC ECEV1CA100SR 7030003860 S.JUMPER ERJ3GE JPW V 4030006850 S.CERAMIC C1608 JB 1H 471K-T-A 7030003860 S.JUMPER ERJ3GE JPW V 4030006850 S.CERAMIC C1608 JB 1H 471K-T-A 7030003860 S.JUMPER ERJ3GE JPW V 4030006850 S.CERAMIC C1608 JB 1H 471K-T-A 9001502002 WIRE 72/98/030/X98/X98...
  • Page 16 [RF UNIT] [RF UNIT] ORDER ORDER DESCRIPTION DESCRIPTION L206 6200005690 S.COIL ELJRE 18NG-F 4030006850 S.CERAMIC C1608 JB 1H 471K-T-A L207 6200005690 S.COIL ELJRE 18NG-F 4030007050 S.CERAMIC C1608 CH 1H 220J-T-A L208 6200003640 S.COIL MLF1608K 100K-T 4030006970 S.CERAMIC C1608 CH 1H 060D-T-A 4030010780 S.CERAMIC C1608 CH 1H 1R5C-T-A 4030007010 S.CERAMIC...
  • Page 17 [RF UNIT] ORDER DESCRIPTION C211 4030006860 S.CERAMIC C1608 JB 1H 102K-T-A 6910007660 CONNECTOR IMSA-9210B-1-02T 6510018170 S.CONNECTOR 4-175643-4 7030003860 S.JUMPER ERJ3GE JPW V 7030003860 S.JUMPER ERJ3GE JPW V 7030003860 S.JUMPER ERJ3GE JPW V 7030003860 S.JUMPER ERJ3GE JPW V W201 7030003860 S.JUMPER ERJ3GE JPW V W202 7030003860 S.JUMPER...

  • Page 18: Cabinet Parts

    SECTION 7 MECHANICAL PARTS AND DISASSEMBLY 7-1 CABINET PARTS 7-2 ACCESSORIES [CHASSIS PARTS] REF. NO. ORDER NO. QTY. DESCRIPTION 8930045331 2045 Belt clip-1 REF. NO. ORDER NO. QTY. DESCRIPTION 8820001040 2045 Screw 2510000960 Speaker K036NA500-26A27 3310002090 Antenna 2045ANT 8210015181 Panel 2045 Front Panel-1 [ITA], [CSA] 8210016101 Panel 2045 Front Panel (A)-1 [ITA-1], [CSA-1]...
  • Page 19 EP1 (C) MP11 (C) MP22 (C) MP24 (C) MP8 (C) MP23 (C) MP9 (C) MP30 (C) MP14 (C) MP25 (C) MP1 (RF) MP20 (C) MP3 (C) MP7 (C) MP13 (C) RF unit MP25 (C) DS2 (M) MP10 (C) MP24 (C) EP1 (M) MP1 (C) MP2 (C)
  • Page 20 SECTION 8 SEMI-CONDUCTOR INFORMATION • TRANSISTOR AND FET’S 2SA1362 GR 2SA1586 GR 2SB798 DK 2SC3356 R24 2SC4081 S (Symbol: AEG) (Symbol: SG) (Symbol: DK) (Symbol: R24) (Symbol: BS) 2SC4213 B 2SC4215 O 2SC4226 R25 2SC4228 R44 2SC5108 Y (Symbol: AB) (Symbol: QO) (Symbol: R25) (Symbol: R44)

  • Page 21: Section 9 Board Layouts

    SECTION 9 BOARD LAYOUTS 9-1 MAIN UNIT • TOP VIEW (IC-4008A) R201 D101 9 - 1...
  • Page 22 • BOTTOM VIEW (IC-4008A) to RF unit J2 R106 R112 R100 R101 R103 R102 9 - 2...
  • Page 23 R114 D101 R302 9 - 3...
  • Page 24 to RF unit J2 R106 R112 R100 R101 R103 R102 9 - 4...

  • Page 25: Rf Unit

    9-2 RF UNIT • TOP VIEW to MAIN unit J4 R205 R213 R202 R209 C206 C202 C207 L204 9 - 5...

  • Page 26: Bottom View

    • BOTTOM VIEW C100 R208 L207 C211 L105 R212 R211 C102 R210 R206 C205 L206 9 - 6...

  • Page 27: Block Diagram

    SECTION 10 BLOCK DIAGRAM CHASSIS UNT RF UNIT TX/RX: 433.075-434.775MHz CDBCA450CX24 TA31136FN (450 kHz) Q3: 2SC5194 FI3: CFWM450E FI1: NSVA468 2SC4226 2nd MIX CERAMIC 1st.IF: 21.7 MHz XTAL (450 kHz) Q13: 2SC4081 FL-298 1st MIX D7: MA2S077 2SC4215 Q14: 2SA1586 D101: MA2S077 D8 : 1SS355 2nd.Lo: 21.25 MHz...

  • Page 28: Voltage Diagram

    SECTION 11 VOLTAGE DIAGRAM 11-1 MAIN UNIT : COMMON : TX R100 R101 R102 : RX 100 k 100 k 100 k 100 k 100 k 100 k J4 4-175638-4 to RF unit J2 SO : SQL OPEN UNLK SC : SQL CLOSE BATT LON : LIGHT ON DATA...

  • Page 29: Rf Unit

    11-2 RF UNIT C: COMMON T: TX R: RX T: 0 T: 0 T: 0.57 R: 2.61 R: 0.82 R: 0 FI1 NSVA468 L206 12 nH 18 nH 27 P 17 nH 17 nH 15 nH C210 C209 22 P 1.5 P 10 P MA2S077...
  • Page 30 08190 Sant Cugat del Valles Barcelona, SPAIN Phone : ( 93 ) 589 46 82 Fax : ( 93 ) 589 04 46 A Division of Icom America Inc. 3071 #5 Road, Unit 9, Richmond, B.C., V6X 2T4, Canada : http://www.icomspain.com...
  • Page 31 A-5505I-S Printed in Japan 6-9-16, Kamihigashi, Hirano-ku, Osaka, 547-0002, Japan © 1998 by Icom Inc.

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