Icom IC-M23 Service Manual
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Icom IC-M23 Service Manual

Vhf marine transceiver
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VHF MARINE TRANSCEIVER
S-14720XZ-C1
Apr. 2011

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Summary of Contents for Icom IC-M23

  • Page 1 VHF MARINE TRANSCEIVER S-14720XZ-C1 Apr. 2011...
  • Page 2 8. READ the instructions of the test equipment throughly before connecting it to the transceiver. Icom, Icom Inc. and the Icom logo are registered trademarks of Icom Incorporated (Japan) in Japan, the United States, the United Kingdom, Germany, France, Spain, Russia and/or other countries.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION SPECIFICATIONS SECTION INSIDE VIEWS SECTION DISASSEMBLY INSTRUCTION SECTION CIRCUIT DESCRIPITON RECEIVER CIRCUITS............4-1 TRANSMITTER CIRCUITS .

  • Page 4: Specifications

    SECTION 1. SPECIFICATIONS IC-M23 IC-M24 D GENERAL D GENERAL • Frequency coverage : Transmitting 156.000–161.450 MHz • Frequency coverage : Transmitting 156.025–157.425 MHz Receiving 156.000–163.425 MHz Receiving 156.050–163.275 MHz • Mode : FM (16K0G3E) • Mode : FM (16K0G3E) : 50 Ω (nominal) : 50 Ω...
  • Page 5 SECTION 2. INSIDE VIEWS • MAIN UNIT (TOP VIEW) CHARGING CONTROLLER (IC601) SPEAKER JACK (J251) M3V LINE SW (Q225) 2 - 1...
  • Page 6 • MAIN UNIT (BOTTOM VIEW) WET SENSING JACK (J602) 5 V REGULATOR (IC602) TX POWER AMP CHARGING CONTROL SW (Q54) (Q602) AF POWER AMP TX POWER AMP (IC362) (Q55) PRE-DRIVE AMP 1ST IF FILTER (Q53) (FI150) 1ST IF FILTER (FI151) IF DEMODULATOR IC (IC170) 2ND IF FILTER...

  • Page 7: Disassembly Instruction

    SECTION 3. DISASSEMBLY INSTRUCTION 1. REMOVING THE PCB 6) CAREFULLY lift the PCB out of the front panel, and 1) Remove the battery pack from the transceiver. then turn it over in order to unplug the speaker wire. 2) Remove the DC cap and antenna nut. 3) Remove 6 screws from the rear panel.

  • Page 8: Circuit Descripiton

    SECTION 4. CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS RF CIRCUITS • 2ND IF AND DEMODULATOR CIRCUITS IC170 is an IF demodulate IC which contains the 2nd local The RF circuits consist of RF filters, antenna switch (ANT oscillator, 2nd mixer, limiter and quadrature detector in its SW), RF amplifi...

  • Page 9: Transmitter Circuits

    4-2 TRANSMITTER CIRCUITS TX AF CIRCUITS TX AMPLIFIERS AF signal from the microphone (MIC signals) is passed The frequency-modulated signal from the VCO (Q21, Q22, through the MIC mute SW (IC260A), amplifi ed by MIC AMP D22) is passed through the buffers (Q23 and Q24) and LO (IC200B), and then applied to the D/A converter (IC190), SW (D50), and then sequentially amplified by the buffer through another MIC mute SW (IC260C).

  • Page 10: Frequency Synthesizer Circuits

    4-3 FREQUENCY SYNTHESIZER CIRCUITS While transmitting, the oscillatinon frequency of VCO (Q21, Q22, D22) is determined by the value of D22, L22, C26 and IC1 is a PLL IC which contains the prescaler, programmable C27, and the frequency modulation is carried out by adding counter, phase comparator and charge pump in its package.

  • Page 11: Port Allocations

    4-5 PORT ALLOCATIONS • CPU (IC360) LINE LINE DESCRIPTION DESCRIPTION NAME NAME MIC mute control. BEEP Beep audio (Squarewave). PTTM L=MIC mute. PLL power save mode control. [PTT] input. Decoded tone signal. (for monitoring PTTIN TDEC H=Pushed. purpose) TX power control. DASTB Strobe for the D/A converter.

  • Page 12: Adjustment Procedures

    SECTION 5. ADJUSTMENT PROCEDURE 5-1 PREPARATION ¤ REQUIRED EQUIPMENTS EQUIPMENT GRADE AND RANGE EQUIPMENT GRADE AND RANGE Cloning software CS-M24/M23 ADJ (Revision 1.0 or later) Cables OPC-478UC and OPC-2091 Frequency range : 0.1–300 MHz Frequency counter Frequency accuracy : ±1 ppm or better Measuring range : 0.1–6 W Input level...

  • Page 13: Frequency Adjustments

    ¤ ADJUSTMENT UTILITY SCREEN ADJUSTMENT CONDITION REFERENCE FREQUENCY TX OUTPUT POWER RX SENSITIVITY SQUELCH 5-2 FREQUENCY ADJUSTMENTS 1) Select an adjustment item using [↑]/[↓] on the PC's keyboard. 2) Set or modify the adjustment value as specifi ed using [←]/[→] on the PC's keyboard, then push [ENTER]. TRANSCEIVER’S ADJUSTMENT ADJUSTMENT...

  • Page 14: Receive Adjustments

    5-3 RECEIVE ADJUSTMENTS 1) Select an adjustment item using [↑]/[↓] on the PC's keyboard. 2) Set or modify the adjustment value as specifi ed using [←]/[→] on the PC's keyboard, then push [ENTER]. TRANSCEIVER’S ADJUSTMENT ADJUSTMENT OPERATION VALUE CONDITION ITEM RX SENSITIVITY 1 NOTE: When "RX SENSITIVITY"...

  • Page 15: Parts List

    SECTION 6. PARTS LIST [MAIN UNIT] [MAIN UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION 1130011671 S.IC MB15E03SLPFV1-G-ER-6E1 41.85/11.6 6200011021 S.COI ELJRF 82NJFB 51.0/20.0 IC50 1110006490 S.IC LMV321IDCKR 96.7/19.9 6200002861 S.COI NLV25T-4R7J 51.5/9.2 IC170 1110007320 S.IC NJM2591V-TE1-#ZZZB 56.7/36.9 6200009910 S.COI C6342A-88NG-A 57.0/9.7 IC190 1190001350 S.IC...

  • Page 16: Main Unit

    [MAIN UNIT] [MAIN UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION R120 7030007290 S.RES ERJ2GEJ 222 X (2.2K) 82.0/24.9 R452 7030007290 S.RES ERJ2GEJ 222 X (2.2K) 69.2/27.5 R121 7030005220 S.RES ERJ2GEJ 223 X (22K) 86.1/24.0 R457 7030005050 S.RES ERJ2GEJ 103 X (10K) 50.6/29.4 R122 7030005100 S.RES ERJ2GEJ 154 X (150K)
  • Page 17 [MAIN UNIT] [MAIN UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION 4030017400 S.CER C1005 CH 1H 220J-T 102.0/5.5 C370 4030018070 S.CER C1005 CH 1H 300J-T 19.7/17.3 4030018120 S.CER C1005 CH 1H 110J-T 103.1/6.7 C371 4030017670 S.CER C1005 CH 1H 390J-T 22.0/5.9 4030017410 S.CER C1005 CH 1H 240J-T 103.5/5.5 C372...
  • Page 18 [MAIN UNIT] PARTS DESCRIPTION LOCATION DS240 5040003060 S.LED SML-512WWT86 53.1/3.8 DS241 5040003060 S.LED SML-512WWT86 61.1/3.8 DS242 5040003510 S.LED LNJ426W83RA 17.2/32.2 DS243 5040003510 S.LED LNJ426W83RA 28.1/32.2 DS244 5040003510 S.LED LNJ426W83RA 17.2/18.5 DS245 5040003510 S.LED LNJ426W83RA 28.1/18.5 DS246 5030003400 LCD TAK-35920 FX3340<ITAK> DS247 5040003560 LED RT3-234HRH16T-BNS <ROD>...
  • Page 19 SECTION 7. MECHANICAL PARTS [CHASSIS PARTS] [MAIN UNIT] ORDER ORDER DESCRIPTION QTY. DESCRIPTION QTY. J251* 6510021901 BM02B-ASRS-TF (LF) (SN) 6910014190 2497 ANT CONNECTOR <EIK> J601* 6510027970 LGP2631-0200FC J602* 6510009351 B2B-ZR (LF) (SN) 2510001410 036D0803-1 DS246* 5030003400 TAK-35920 FX3340 <ITAK> DS247* 5040003560 RT3-234HRH16T-BNS <ROD> 8900009640 OPC-963 8900020040 OPC-2138 MC250* 7700002710 EM6027P-46C33-G <HOR>...
  • Page 20 MP10(CH) MP24(CH)x6 MP25(CH)x6 MP11(CH) MP21(CH) MP51(CH)x2 MP13(CH)x2 MP22(CH) MP48(CH) MP52(CH) W2(CH) MP12(CH) MP14(CH) To J602(M) MP33(CH) J31(CH) MP35(CH) MP31(CH) MAIN UNIT MP34(CH) MP32(CH) MP16(CH) MP39(CH) MP42(CH) MP33(CH)x4 MP362(M) MP50(CH) MP17(CH) MP7(CH) MP363(M) Abbreviations; MP18(CH) (CH): CHASSIS PARTS MP360(M) MP15(CH) (M): MAIN UNIT SP1(CH) MP361(M) MP1(CH)
  • Page 21 SECTION 8. BOARD LAYOUTS The combination of this page and next page shows the top side and bottom side of actual P.C. board. • MAIN UNIT (TOP VIEW) J251 [DC] J601 MC250 EP11 Q151 C156 D357 R264 R155 C159 R156 D601 C607 Q363...
  • Page 22 The combination of this page and next page shows the top side and bottom side of actual P.C. board. • MAIN UNIT (BOTTOM VIEW) [PTT] WET SENSOR S250 J602 FI150 FI151 J602 J602 R253 C254 R270 X170 C467 R415 FI170 R255 C182 C170...
  • Page 23 SECTION 9. BLOCK DIAGRAM Q608:2SJ347 F CHASSIS Q609:LDTC144TE DS247:RT3-239HRH16T D612:L1SS400E DS248:SML-A12UT FLASH MAIN UNIT ANTENNA Q 21,Q22:KTC3770U D 50,D51: D52:1SV307 IC1:MB15E03SLPFV1 Q362:LDTC144EE Q23: Q24: Q50: Q53: Q54: HVD144A D90:HVD144A D22:HVB350BYPTL 2SC4215 2SC4215 KTC3770U RD01MUS2 RD07MUS2B LOOP BUFF BUFF BUFF DRIVE COMBINER SPLITTER BATTERY VOLTAGE...
  • Page 24 SECTION 10. VOLTAGE DIAGRAM • MAIN UNIT (1/2) CPU3V IC190 M62364FP DS246 TAK-35920 VIN1 VIN8 2 VOUT1 VOUT8 3 VOUT2 VOUT7 4 VIN2 VIN7 5 VDD 6 LD DAST RESET 7 CLK VDAREF 8 DI R192 9 VIN3 IC365 VIN6 IC200 MCON LMV358IPW...
  • Page 25 TX:2.25V TX:2.62V • MAIN UNIT (2/2) RX:2.31V RX:0.00V TX:2.84V RX:2.86V 2.62V NLV25T C6342A 1.5P C453 L107 0.30-0.9-3TR 0.001 0.30-1.7-7TL 1SV307 0.001 0.26-1.1-7TR 0.75P L100 L102 LDTC144EE C444 C447 0.001 RD07MUS2B-T112 TX:1.35V 0.001 0.001 2SC4215 2SC4215 RX:0.00V MB15E03SLPFV1-G-BND-E1 KTC3770U KTC3770U TX:0.58V L101 SDATA RX:0.62V...
  • Page 26 Highway 17 Delta, B.C., V4K 5B8, Canada : http://www.icomspain.com Phone : +1 (604) 952-4266 Fax : +1 (604) 952-0090 E-mail : icom@icomspain.com : http://www.icomcanada.com E-mail : info@icomcanada.com Blacksole House, The Boulevard, Altira Business Park, Herne Bay, CT6 6GZ, UK Phone : +44 (01227) 741741...
  • Page 27 S-14720XZ-C1 1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan © 2011 Icom Inc.

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