Icom IC-A22 Service Manual
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Icom IC-A22 Service Manual

Vhf air band transceivers
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SERVICE
MANUAL
VHF AIR BAND TRANSCEIVERS
S-14201HZ-C1
May. 2005

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Summary of Contents for Icom IC-A22

  • Page 1 SERVICE MANUAL VHF AIR BAND TRANSCEIVERS S-14201HZ-C1 May. 2005...
  • Page 2 8. READ the instructions of test equipment thoroughly before connecting equipment to the transceiver. Icom, Icom Inc. and logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom, Germany, France, Spain, Russia and/or other countries.

  • Page 3: Table Of Contents

    LOGIC UNIT [IC-A22/E]........

  • Page 4: Specifications

    SECTION 1 SPECIFICATIONS M GENERAL • Frequency coverage (Unit; MHz) : IC-A22 IC-A22E IC-A3 IC-A3E TX Communications 118.000–136.975 118.000–136.975 118.000–136.975 118.000–136.975 Communications 118.000–136.975 118.000–136.975 118.000–136.975 118.000–136.975 Navigation 108.000–117.975 108.000–117.975 – – Weather 161.650–163.275 – 161.650–163.275 – • Mode : Tx/Rx AM (6K00A3E) FM (16K0G3E;...

  • Page 5: Inside Views

    (Q4001: 3SK230) located under this side AF power regulator (Q5006: 2SB1201) Rx BPF's 1st IF filters FM IF IC FI4001: (IC5001: TA31136F) FL-221 [IC-A22/E] FL-203 [IC-A3/E] AF selector VCO board (IC5002: TC4W53F) RF power amplifier (IC4002: SC-1303) Buffer amplifier/LPF (IC5005: TC75W51FU) PLL reference oscillator 12.8 MHz...

  • Page 6: Circuit Description

    SECTION 3 CIRCUIT DESCRIPTION The 1st IF signal from the RF unit is applied to a 2nd mixer 3-1 RECEIVER CIRCUITS section of IC5001 (pin 16). The signal is then mixed with a 3-1-1 ANTENNA SWITCHING CIRCUIT (RF UNIT) 2nd LO signal for conversion to a 455 kHz 2nd IF signal. The antenna switching circuit functions as a low-pass fi...
  • Page 7 The ANL (Automatic Noise Limiter) circuit (D5003, Q5008, R5015–R5018) reduces pulse noises. The AM detector output signal (DETO) from Q5004 is 3-1-10 VOR CIRCUIT (LOGIC UNIT) [IC-A22/E only] applied to the cathode of D5003 passing through R5015 The VOR circuit detects a variable signal (VORC) and where it is divided by R5015 and R5016.

  • Page 8: Transmitter Circuits

    The detected voltage is applied to one of the differential 3-2 TRANSMITTER CIRCUITS amplifier input (Q4010) and a power setting voltage is 3-2-1 MICROPHONE AMPLIFIER CIRCUIT (MAIN UNIT) applied to the other input. When the antenna impedance is AF signals from the microphone or from the [MIC] jack are mismatched, the detected voltage exceeds the APC output applied to the ALC amplifi...

  • Page 9: Power Supply Circuits

    TMUT Outputs a Tx mute signal. Low: for muting Q4013 and D4016. Outputs a "shift" signal for VCO oscillating SHIFT frequency. Note: * for IC-A22/E only 3-5 CPU PORT ALLOCATIONS PORT DESCRIPTION NAME Input port for detecting the connected LBATT battery (or external DC input) voltage for "LOW BATT"...

  • Page 10: Adjustment Procedures

    SECTION 4 ADJUSTMENT PROCEDURES 4-1 PLL AND TRANSMITTER ADJUSTMENTS ADJUSTMENT MEASUREMENT POINT ADJUSTMENT ADJUSTMENT CONDITIONS VALUE UNIT LOCATION UNIT ADJUST TUNE 1 • Displayed frequency : 118.025 MHz Connect the digital 1.4–1.6 V R4068 VOLTAGE • Receiving multimeter or oscillo- scope to CP2 (TUNE).
  • Page 11 RF UNIT RF POWER METER ATTENUATOR MODULATION 50 Ω/1–10 W 40 or 50 dB ANALYZER FREQUENCY DUMMY LOAD 8 Ω COUNTER to [SP] to [ANT] to [MIC] MILLIVOLTMETER AUDIO GENERATOR 300–3000 Hz R4057 Power adjustment Reference frequency C4101 adjustment Tune voltage check point DC POWER SUPPLY R4068 Tune voltage...

  • Page 12: Receiver Adjustment

    • Receiving 1 • While pushing [1] and [9], turn power Function display "FROM, 90°" ±3° LOGIC R6151 (IC-A22/E only) ON to enter the VOR setting mode. pannel • Displayed frequency : 113.000 MHz • Connect the SSG to the antenna con- nector and set as;...
  • Page 13 4 - 4...

  • Page 14: Parts List

    SECTION 5 PARTS LIST • IC-A22/E [RF UNIT] [RF UNIT] ORDER ORDER DESCRIPTION DESCRIPTION R4010 7030003680 S.RES ERJ3GEYJ 104 V (100 kΩ) IC4001 1130007610 S.IC µPD3140GS-E1 (DS8) R4011 7030003640 S.RES ERJ3GEYJ 473 V (47 kΩ) IC4002 1110003680 IC M68721/SC1303 7030003280 S.RES ERJ3GEYJ 470 V (47 Ω) R4012 7030003280 S.RES ERJ3GEYJ 470 V (47 Ω)
  • Page 15 [RF UNIT] [RF UNIT] ORDER ORDER DESCRIPTION DESCRIPTION C4007 4030007050 S.CER C1608 CH 1H 220J-T C4141 4030006860 S.CER C1608 JB 1H 102K-T C4008 4030007080 S.CER C1608 CH 1H 390J-T C4143 4030006860 S.CER C1608 JB 1H 102K-T C4009 4030007030 S.CER C1608 CH 1H 150J-T C4144 4030006860 S.CER C1608 JB 1H 102K-T C4010...
  • Page 16 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION R5104 7030003540 S.RES ERJ3GEYJ 682 V (6.8 kΩ) D5006 1790001280 S.DIO MA111 (TX) R5105 7030003700 S.RES ERJ3GEYJ 154 V (150 kΩ) D5007 1790001280 S.DIO MA111 (TX) R5106 7030003880 S.RES ERJ3GEYJ 244 V (240 kΩ) [AUS], [UK], [USA-1] only D5008 1790001280 S.DIO MA111 (TX) R5107...
  • Page 17 [MAIN UNIT] [LOGIC UNIT] ORDER ORDER DESCRIPTION DESCRIPTION C5089 4030006860 S.CER C1608 JB 1H 102K-T R6126 7030003620 S.RES ERJ3GEYJ 333 V (33 kΩ) C5090 4510004650 S.ELE ECEV1EA4R7SR R6127 7030003720 S.RES ERJ3GEYJ 224 V (220 kΩ) R6128 7030003540 S.RES ERJ3GEYJ 682 V (6.8 kΩ) R6129 7030003700 S.RES ERJ3GEYJ 154 V (150 kΩ) J5001...

  • Page 18: Vco Unit

    [VCO UNIT] ORDER DESCRIPTION Q7001 1530002920 S.TR 2SC4226-T1 R25 Q7002 1530002920 S.TR 2SC4226-T1 R25 Q7003 1530002560 S.TR 2SC4403-3-TL D7001 1790001290 S.VCP MA304 (TX) D7002 1790000620 S.DIO MA77 (TX) L7001 6200001520 S.COL MLF2012D R82K-T L7002 6110002990 COL LA-487 L7003 6200001630 S.COL ELJNC R10K-F R7001 7030003550 S.RES ERJ3GEYJ 822 V (8.2 kΩ) 7030003360 S.RES ERJ3GEYJ 221 V (220 Ω)
  • Page 19 • IC-A3/E [RF UNIT] [RF UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 7030003280 S.RES ERJ3GEYJ 470 V (47 Ω) IC4001 1130007610 S.IC µPD3140GS-E1 (DS8) R4012 7030003280 S.RES ERJ3GEYJ 470 V (47 Ω) IC4002 1110003680 IC M68721/SC1303 R4013 R4014 7030003720 S.RES ERJ3GEYJ 224 V (220 kΩ) R4015 7030003720 S.RES ERJ3GEYJ 224 V (220 kΩ) Q4001...
  • Page 20 [RF UNIT] [RF UNIT] ORDER ORDER DESCRIPTION DESCRIPTION C4002 4030006980 S.CER C1608 CH 1H 070D-T C4129 4030006860 S.CER C1608 JB 1H 102K-T C4003 4030008560 S.CER C1608 CH 1H 300J-T C4130 4030006860 S.CER C1608 JB 1H 102K-T C4004 4030006940 S.CER C1608 CH 1H 030C-T C4134 4510004440 S.ELE ECEV1HA010SR C4005...
  • Page 21 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 7030003270 S.RES ERJ3GEYJ 390 V (39 Ω) IC5001 1110003490 S.IC TA31136FN (D,EL) R5049 IC5002 1130005640 S.IC TC4W53F (TE12L) R5050 7030003580 S.RES ERJ3GEYJ 153 V (15 kΩ) IC5003 1110002330 IC TA7368P R5051 7030003800 S.RES ERJ3GEYJ 105 V (1 MΩ) IC5004 1110003670 S.IC BA3308F-E2...
  • Page 22 [LOGIC UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION IC6001 1140004860 S.IC HD4074829TF (Z-TAT) [IC-A3E] C5013 4510004440 S.ELE ECEV1HA010SR 1140004880 S.IC HD404829B96TF [Others] C5014 4510005810 S.ELE ECEV1HAR47R IC6002 1190000260 S.IC 24LC08BTI/SN C5015 4030006850 S.CER C1608 JB 1H 471K-T IC6003 1110005930 S.IC S-80845CLMC-B66-T2 [EUR-1], [AUS] C5016...
  • Page 23 [MAIN UNIT] ORDER DESCRIPTION EP6002 8930034040 LCT SRCN-1541 SG Except [AUS] EP6002 8930040950 LCT SRCN-1541-SS [AUS] EP6002 8930045060 LCT SRCN-1541-SP-N-W [VCO UNIT] ORDER DESCRIPTION Q7001 1530002920 S.TR 2SC4226-T1 R25 Q7002 1530002920 S.TR 2SC4226-T1 R25 Q7003 1530002560 S.TR 2SC4403-3-TL D7001 1790001290 S.VCP MA304 (TX) D7002 1790000620 S.DIO MA77 (TX)

  • Page 24: Mechanical Parts And Disassembly

    5030001180 LCD LD-BU4279J [IC-A3/E] MP3012 8930030041 1452 contact spring-1 MP3013 8930029830 1452 SP rubber EP6002 8930045060 LCD contact SRCN-1541-SP-N-W [IC-A22/E] MP3014 8310034120 1541 bottom plate 8930045060 LCD contact SRCN-1541-SP-N-W [IC-A3/E] MP3015 8930033400 1541 DC cap MP3016 8930033340 1541 SP holder...
  • Page 25 J3001 (C) MP6002 (L) RF UNIT MP3011 (C) MP3001 (C) MP3021 (C) MP3004 (C) MP3022 (C) MP3002 (C) EP6002 (L) [IC-A22/E] only MP4001 (R) MP3015 (C) MP4002 (R) MP3007 (C) MP3021 (C) MP3019 (C) MP7001 (V) MP3008 (C) MP3014 (C)

  • Page 26: Block Diagram

    HD4074829TF [IC-A3] only VORO EEPROM IC6107 IC6106 NJM2904V NJM2903V PHASE LIMIT FM DET SHIFT COMMON (PTT) Q6110 UNR9213J(A22/E) Q6109: 2SC4211 PTT UNIT UN9213(A3/E) (LIGHT) DATA BUS D6116: MA111 LEVEL (ANL) INITIAL VOR circuit LOGIC UNIT MATRIX MATRIX (IC-A22/E only) 7 - 1...

  • Page 27: Semiconductor Information

    SECTION 8 SEMICONDUCTOR INFORMATION • TRANSISTORS AND FET'S 2SA1162 6 2SB1132 R 2SC3357 RF 2SC4116 BL 2SC4215 O (Symbol: M6) (Symbol: BARB) (Symbol: RF) (Symbol: LL) (Symbol: QO) 2SC4226 R25 2SC4403 3 2SD1819A R 3SK151 Y 3SK230 U1B (Symbol: R25) (Symbol: LY3) (Symbol: LG) (Symbol: UH)

  • Page 28: Board Layouts

    SECTION 9 BOARD LAYOUTS 9-1 PTT UNIT 9-3 VCO BOARD SHIFT J9001 NOTE: Add "7000" to each indicated part number on the board R10K for the actual part number. PTTSW R12K LIGHT NOTE: Add "9000" to each indicated part number on the unit for the actual part number.

  • Page 29: Rf Unit

    9-4 RF UNIT • TOP VIEW MP4001 MP4002 EXTPTT EXTMIC RF-AGC CLONE SIDET INTSP EXTSP SHIFT TMUT VCO BOARD DATA SHIFT IC4002 MP7001 X4001 P5001 TO PRT UNIT FROM MAIN UNIT J5004 NOTE: Add "4000" to each indicated part number on the unit for the actual part number. 9 - 2...
  • Page 30 • BOTTOM VIEW (RF UNIT) NOTE: Add "4000" to each indicated part number on the unit for the actual part number. 9 - 3...

  • Page 31: Main Unit

    9-5 MAIN UNIT • TOP VIEW DIAL POWER VOL/SQL INTSP DOWN BEEP DETO SHIFT AFON TMUT CLONE DATA INTMIC NOTE: Add "5000" to each indicated part number on the unit for the actual part number. 9 - 4...
  • Page 32 • BOTTOM VIEW (MAIN UNIT) EXTPTT EXMIC RF-AGC CLONE SIDET INTSP EXTSP (NC) TMUT (NC) DATA SHIFT NOTE: Add "5000" to each indicated part number on the unit for the actual part number. 9 - 5...

  • Page 33: Logic Unit [Ic-A22/E]

    9-6 LOGIC UNIT [IC-A22/E] • TOP VIEW DS6001 NOTE: Add "6000" to each indicated part number on the unit for the actual part number. 9 - 6...
  • Page 34 • BOTTOM VIEW (LOGIC UNIT [IC-A22/E]) DOWN BEEP SHIFT DETO AFON TMUT R10K PTTSW CLONE R12K DATA INTMIC NOTE: Add "6000" to each indicated part number on the unit for the actual part number. 9 - 7...

  • Page 35: Logic Unit [Ic-A3/E]

    9-7 LOGIC UNIT [IC-A3/E] • TOP VIEW DS6001 NOTE: Add "6000" to each indicated part number on the unit for the actual part number. 9 - 8...
  • Page 36 • BOTTOM VIEW (LOGIC UNIT [IC-A3/E]) DOWN BEEP SHIFT DETO AFON TMUT R10K PTTSW CLONE R12K DATA INTMIC NOTE: Add "6000" to each indicated part number on the unit for the actual part number. 9 - 9...

  • Page 37: Voltage Diagrams

    TX: 0V TX: 0V R5027 RX: 0.07V RX: 1.15V TX: 0V TX: 0V R5025 RX: 1.1V RX: 2.7V R5088 170k(IC-A22/E) TX: 0V ANL ON: 5V 1k(IC-A3/E) RX: 3.4V ANL OFF: 0V TX: 0V RX: 0.8V R5115 TX: 0V Q5008 RX: 1.15V 0.1(IC-A22/E)

  • Page 38: Rf Unit (Inc. Prt Unit And Vco Board)

    1SV246 R4095 R4044 C4057 2.2k 0.001 C4054 C4130 L4006 TX: 2.8V TX: 2.4V 0.001 56nH RX: 0V RX: 0V TX: 0.8V(IC-A22/E) TX: 1.8V Q4007 0.5V(IC-A3/E) C4059 C4014 C4051 R4073 C4129 TX: 3.4V RX: 0V 2SC3357 RX: 0V 0.001 0.001 0.001...

  • Page 39: Logic Unit (Inc. Ptt Unit)

    10-3 LOGIC UNIT LOGIC UNIT DS6001 LD-BU4240J (FUNCTION DISPLAY) SEG39 R60/SEG13 SHIFT SEG40 R53/SEG12 TMUT SEG41 R52/SEG11 SEG42 R51/SEG10 AFON SEG43 R50/SEG9 SEG44 R43/SEG8 SEG45 R42/SEG7 SEG46 R41/SEG6 SEG47 R40/SEG5 D6005 D6004 SEG48 R33/SEG4 MA6S121 MA111 SEG49 R32/SEG3 SEG50 R31/SEG2 IC6001 SEG51 R30/SEG1...
  • Page 40 S9001 S9003 S9002 RX: 5V EM-140 (PTT) (ANL) (LIGHT) MEASUREMENT CONDITION INTMIC VOLTAGE: 12.0V VOLTMETER:50kΩ/V DC FREQUENCY: 127.025MHz(VOR: 113.000MHz) (NO MODULATION) PTTSW IC-A22/E ONLY R6131 C6131 R6147 IC6106 NJM2903V IC6107 NJM2904V C6129 0.0047 R6144 D6115 MA111 J6002 C6126 TX: 0V...
  • Page 41 Phone : +34 (93) 590 26 70 Fax : +34 (93) 589 04 46 : http://www.icomspain.com Highway 17 Delta, B.C., V4K 5B8, Canada E-mail : icom@icomspain.com Phone : +1 (604) 952-4266 Fax : +1 (604) 952-0090 : http://www.icomcanada.com E-mail : info@icomcanada.com Unit 9, Sea St., Herne Bay, Kent, CT6 8LD, U.K.
  • Page 42 S-14201HZ-C1 Printed in Japan 1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan © 2005 Icom Inc.

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