Icom IC-M25 Service Manual
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Icom IC-M25 Service Manual

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VHF MARINE TRANSCEIVER
iM25
iM25EURO
S-15208XZ-C1
August 2015

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Summary of Contents for Icom IC-M25

  • Page 1 VHF MARINE TRANSCEIVER iM25 iM25EURO S-15208XZ-C1 August 2015...
  • Page 2 8. READ the instructions of the test equipment thoroughly 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, Australia, New Zealand, and/or other countries.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION SPECIFICATIONS SECTION INSIDE VIEWS SECTION DISASSEMBLY INSTRUCTION SECTION BATTERY PACK REPLACEMENT SECTION CIRCUIT DESCRIPITON RECEIVER CIRCUITS ..................5-1 TRANSMITTER CIRCUITS ................5-2 FREQUENCY SYNTHESIZER CIRCUITS ............5-3 VOLTAGE BLOCK DIAGRAM ................5-3 SECTION ADJUSTMENT PROCEDURES PREPARATION ....................6-1 FREQUENCY ADJUSTMENT ................

  • Page 4: Section 1 Specifications

    SECTION 1 SPECIFICATIONS M GENERAL M TRANSMITTER IC-M25 (Except [CHN]) IC-M25 (Except [CHN]) • Frequency coverage (MHz): • Output power: 5 W (approximately)/1 W 156.025–157.425 • Modulation system: Variable reactance frequency modulation 156.050–163.275 • Maximum frequency deviation: • Mode: FM (16K0G3E) ±5 kHz...

  • Page 5: Section 2 Inside Views

    ??????? (???) ??????? ??????? (???) (???) SECTION 2 INSIDE VIEWS • MAIN UNIT (TOP VIEW) LOCK VOLTAGE BUFFER (IC400) AF SW (IC260) LITHIUM BATTERY CHARGER (IC601)
  • Page 6 ??????? (???) ??????? ??????? (???) (???) • MAIN UNIT (TOP VIEW) EEPROM (IC340) RESET (IC341) OM VIEW) +3 V REGULATOR (IC220) CPU CLOCK (X360) ????? TX POWER AMP (Q54) TX POWER AMP (Q55) DRIVE AMP (Q53) AF POWER AMP (IC362) AF AMP (IC364) 1st IF FILTER...

  • Page 7: Section 3 Disassembly Instruction

    起こす 起こす ケーブル フラッ ト フラッ トケーブル フラッ トケーブル フラッ トケーブル クランプ ケーブル フラッ ト フラッ ト ケーブル フラッ ト ケーブル ケーブル フラッ ト ケーブル ロックをはずす まっすぐ引き抜く フラッ ト ケーブル 起こす フラッ トケーブル ケーブル フラッ トケーブル フラッ ト フラッ ト SECTION 3 DISASSEMBLY INSTRUCTION ケーブル...

  • Page 8: Section 4 Battery Pack Replacement

    SECTION 4 BATTERY PACK REPLACEMENT 2. Installing the new battery pack NOTE: 1) Glue the ferrite core to fix its position. • Before the disassembly, dry the transceiver if it is wet. • Dispose the old battery pack according to the laws in your Glue area.

  • Page 9: Receiver Circuits

    SECTION 5 CIRCUIT DESCRIPTION 5-1 RECEIVER CIRCUITS 2ND IF AND DEMODULATOR CIRCUITS RF CIRCUITS IC170 is an IF IC which contains the 2nd local oscillator, 2nd mixer, limiter and quadrature detector in its package. The RF circuits consist of RF filters, antenna switch, RF amplifier (RF AMP) and so on.

  • Page 10: Transmitter Circuits

    5-2 TRANSMITTER CIRCUITS TX AF CIRCUITS TX AMPLIFIERS The AF signal from the microphone (MIC signals) is passed The frequency-modulated signal from the VCO (Q21, Q22, through the MIC mute SW (IC260A), amplified by MIC AMP D22 and D23) is passed through the buffers (Q23 and Q24) (IC200B), and then applied to the D/A converter (IC190), and LO SW (D50), and then sequentially amplified by the through another MIC mute SW (IC260C).

  • Page 11: Frequency Synthesizer Circuits

    5-3 FREQUENCY SYNTHESIZER CIRCUITS While transmitting, the oscillation frequency of the VCO IC1 is a PLL IC which contains the pre-scaler, programmable (Q21, Q22, D22 and D23) is determined by the value of counter, phase comparator and charge pump in its package. D22, D23, L22, C26 and C27, adding modulation signal to D20 modulates the oscillating signal.

  • Page 12: Preparation

    SECTION 6 ADJUSTMENT PROCEDURE 6-1 PREPARATION M REQUIRED EQUIPMENTS EQUIPMENT GRADE AND RANGE EQUIPMENT GRADE AND RANGE Cloning software ADJ-M25/M25EURO (Revision 1.0 or later) Cables OPC-478UC and OPC-1655 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 Adjustment

    M ADJUSTMENT UTILITY SCREEN ADJUSTMENT CONDITION REFERENCE FREQUENCY TX OUTPUT POWER RX SENSITIVITY SQUELCH 6-2 FREQUENCY ADJUSTMENTS 1) Select an adjustment item using [↑]/[↓] on the PC's keyboard. 2) Set or modify the adjustment value as specified using [←]/[→] on the PC's keyboard, and then push [ENTER]. TRANSCEIVER’S ADJUSTMENT ADJUSTMENT...

  • Page 14: Receive Adjustment

    6-3 RECEIVE ADJUSTMENTS 1) Select an adjustment item using [↑]/[↓] on the PC's keyboard. 2) Set or modify the adjustment value as specified using [←]/[→] on the PC's keyboard, and then push [ENTER]. TRANSCEIVER’S ADJUSTMENT ADJUSTMENT OPERATION VALUE CONDITION ITEM RX SENSITIVITY 1 NOTE: When "RX SENSITIVITY"...

  • Page 15: Parts List

    SECTION 7. PARTS LIST [MAIN UNIT] [MAIN UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION 1130016080 S.IC GP214D <SEI> 39.6/11.3 6200011021 S.COI ELJRF 82NJFB *0 68.6/26.0 IC50 1110008890 S.IC NJU7056F3-TE2-#ZZZH 105.1/20.3 6200011031 S.COI ELJRF R10JFB *0 70.6/20.2 IC170 1110007320 S.IC NJM2591V-TE1-#ZZZB 17.7/8.9 6200011021 S.COI ELJRF 82NJFB *0...
  • Page 16 [MAIN UNIT] [MAIN UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION R171 7030009140 S.RES ERJ2GEJ 272 X (2.7K) 23.2/10.5 R452 7030007290 S.RES ERJ2GEJ 222 X (2.2K) 43.9/46.4 R172 7030005000 S.RES ERJ2GEJ 471 X (470) 21.0/11.9 R457 7030005050 S.RES ERJ2GEJ 103 X (10K) 32.2/34.0 R173 7030005030 S.RES ERJ2GEJ 152 X (1.5K)
  • Page 17 [MAIN UNIT] [MAIN UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION C100 4030017360 S.CER C1005 CH 1H 030B-T 99.7/16.6 C450 4030017500 S.CER C1005 CH 1H 560J-T 75.0/15.0 C101 4030017580 S.CER C1005 CH 1H 060C-T 97.0/19.5 C451 4030017730 S.CER C1005 JB 1H 471K-T 82.3/21.6 C102 4030016790 S.CER C1005 JB 1E 103K-T...

  • Page 18: Mic Unit

    [MIC UNIT] PARTS DESCRIPTION LOCATION C410 4030017620 S.CER C1005 CH 1H 100C-T 11.7/20.7 C411 4030017420 S.CER C1005 CH 1H 470J-T 11.6/11.9 J250 6450002460 CON HSJ1594-010160 J607 6510025142 S.CON 10FLT-SM2-TB(LF)(SN)(M) 11.2/8.1 J608 6510009351 CON B2B-ZR(LF)(SN) S250 2260001900 SWI SW-149 (SKHLLDA010) 8900014801 CAB OPC-1573-1(P0.5N10L50) <TJM>...
  • Page 19 SECTION 8. MECHANICAL PARTS [CHASSIS PARTS] [MAIN UNIT] ORDER ORDER DESCRIPTION QTY. DESCRIPTION QTY. J251* 6510021901 BM02B-ASRS-TF (LF) (SN) 8210031130 3723 FRONT PANEL ASSEMBLY [USA] J252* 6510022692 06FLT-SM2-TB (LF) (SN) (M) 8210031130 3723 FRONT PANEL ASSEMBLY [EXP] J601* 6510030040 CSS5005-4R11F 8210031100 3723 FRONT PANEL ASSEMBLY (A) [EUR] J603*...
  • Page 20 MP24(CHASSIS)x6 (8820001510) MP25(CHASSIS)x6 (8930063690) MP48(CHASSIS) (8930030920) MP51(CHASSIS) (8930092190) W2(CHASSIS) MP22(CHASSIS) MP14(CHASSIS) (8920001430) (8930092140) (8850003421) J31(CHASSIS) (6910021491) MP31(CHASSIS) (8010023460) MIC UNIT MP57(CHASSIS) (8930057950) MP33(CHASSIS) (8810009511) EP1(CHASSIS) MP33(CHASSIS)x3 (0800014740) (8810009511) MAIN UNIT MP363(MAIN) MP60(CHASSIS) (8930092240) (8930092180) MP58(CHASSIS) (8930085980) MP360(MAIN) (8210030990) MP16(CHASSIS) (8930092080) DS246(MAIN) (5030003980) EP360(MAIN)

  • Page 21: Section 9 Board Layouts

    SECTION 9. BOARD LAYOUTS • MIC UNIT B-8383 (TOP VIEW) [PTT] • MAIN UNIT B-8382 [SP/MIC] (TOP VIEW) R371 R373 R372 C364 C260 IC260 R262 C612 C262 C366 R607 R608 R300 R265 R214 C607 C206 C207 R388 R396 CP360 R240 R468 C360 C155...
  • Page 22 • MIC UNIT B-8383 (BOTTOM VIEW) SP1 (CHASSIS) J251 MC250 SP− 2 [PWR] • MAIN UNIT B-8382 (BOTTOM VIEW) C251 R451 [Charge] R227 C382 Q230 R387 R450 R270 MP100 R228 R252 C255 C231 C252 R251 C615 Q225 C377 C616 Q608 C385 R204 R393...

  • Page 23: Section 10 Block Diagram

    SECTION 10. BLOCK DIAGRAM CHASSIS MAIN UNIT ANTENNA BATTERY VOLTAGE Q21,Q22:KTC3770U CHARGE IC1:GP214D Q362:LDTC144EE Q23: Q24: D50,D51: Q50: Q53: Q54: D52:1SV307 D22,D23:BBY58 2SC4215 2SC4215 RN142G KTC3770U RD01MUS2B RD07MUS2B D90:KDS114E BTEMPV PLL IC LOOP TX/RX BUFF BUFF BUFF DRIVE SPLITTER COMBINER Q20:LDTC144EE CR-766 D20:KDS114E Q55:...

  • Page 24: Voltage Diagram

    SECTION 11. VOLTAGE DIAGRAM • MAIN UNIT (1/2) CPU3V FCON R192 MODC DS246 TJ3901TF IC190 VIN2 VIN7 IC200 IC365 NJU7058V NJU7057RB1 DAST RESET VDAREF2 SDATA VDAREF1 VIN3 VIN6 R242 R2A20178 LED ON 2.99V LED OFF 0.00V LEDR Q240 C437 0.00V INT.PTT EXT.PTT 2.97V...
  • Page 25 • MAIN UNIT (2/2) 2.27V 2.27V 2.35V 2.35V 2.65V MPZ1608S221A 2.61V 0.00V MPZ1608S221A 0.001 0.001 C453 L107 RD07MUS2B 45.3N 0.001 1SV307 Fin1 Fin2 C444 L100 C447 L102 0.001 L1SS400 1.5P UNLK 0.001 2SC4215 4.7k 45.3N L101 LDTC144EE KTC3770U 0.61V OSCI 2SC4215 L108 0.62V...
  • Page 26 Highway 17A 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, Altira Park, Herne Bay, Kent CT6 6GZ, UK Phone : +44 (0) 1227 741741...
  • Page 27 S-15208XZ-C1 1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan © 2015 Icom Inc.

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