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Icom IC-M412 Service Manual
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Icom IC-M412 Service Manual

Icom IC-M412 Service Manual

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VHF MARINE TRANSCEVER
S-14709-C1
Sep. 2010

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Summary of Contents for Icom IC-M412

  • Page 1 ® VHF MARINE TRANSCEVER S-14709-C1 Sep. 2010...
  • Page 2 8. READ the instructions of test equipment throughly before connecting a test equipment 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 CONTENTS SECTION SPECIFICATIONS SECTION INSIDE VIEWS SECTION DISASSEMBLY INSTRUCTION SECTION CIRCUIT DESCRIPITON RECEIVER CIRCUITS............4-1 TRANSMITTER CIRCUITS .
  • Page 4 SECTION 1 SPECIFICATIONS ¤ SPECIFICATIONS D Transmitter D General Rx 156.050–163.275 MHz modulation FM (16K0G3E), DSC (16K0G2B) Less than 56 dBc (Low) Max. audio 1.5 A max. –20°C to +60°C; –4°F to +140°F ø nominal ø range from 300 to 2500 Hz ø...
  • Page 5 SECTION 2 INSIDE VIEWS CPU CLOCK PHOTO COUPLER (X1) (IC5) • LOGIC-A UNIT FRONT SPEAKER LCD DRIVER (SP1) (IC8) DUAL OP AMP (as a buffer) BACKLIGHT DRIVER (IC2) (Q1) EEPROM (IC3) (IC1) • MAIN-A UNIT <CH70 RX> 1ST IF FILTERs (FI4, 5) <CH70 RX>...
  • Page 6 SECTION 3 DISASSEMBLY INSTRUCTION • • REMOVING THE CASE REMOVING THE MAIN-A UNIT q Unscrew 4 screws from the bottom of FRONT-A UNIT. q Remove the IC clip from the CHASSIS. w Disconnect 2 cables from the MAIN-A UNIT. Note: When replacing the screws, 10–12 kg of torque e Disconnect the cable from the FRONT-A UNIT, and MUST be applied to ensure waterproof.
  • Page 7 SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS ANTENNA SWITCH (MAIN-RX/CH70-RX) • ANT SW (MAIN-RX/CH70-RX) The received signals (RX signals) from the antenna are passed through the LPF (harmonic fi lter) and ANT SW (as LPF (harmonic filter) ANT SW (TX) an LPF in RX).
  • Page 8 1ST IF CIRCUITS (MAIN-RX) The converted 1st IF signal is passed through two 1st IF The 1st IF circuits consist of 1st mixer, 1st IF fi lter and 1st IF fi lters to remove unwanted signals. The fi ltered 1st IF signal amplifi...
  • Page 9 RF CIRCUITS (CH70-RX) The filtered RX signal from the trap (BEF; Band Elminate RF circuits for CH70-RX consist of RF fi lters and RF amplifi er Filter) are applied to the RF AMP. The amplifi ed RX signal is (RF AMP), and fi lter and amplify the signal of CH70 (156.525 passed through the 2-pole BPF.
  • Page 10 2ND IF AND DEMODULATOR CIRCUITS (CH70-RX) The 2nd IF circuits consist of 2nd mixer, 2nd IF filter and • 2nd IF AND DEMODULATOR CIRCUITS (CH70-RX) 2nd IF amplifier, convert the 1st IF signal into the 2nd IF R541 signal, then filter to fi lter 2nd IF signal only and amplify. And the demodulator circuit converts the 2nd IF signal to AF signals.
  • Page 11 RX AF CIRCUITS (MAIN-RX only) The de-emphasized AF signals are passed through The RX AF circuits consist of AF filter, AF SW, AF the BPF (Q31, 32) and the AF mute SW (IC4, pins amplifi er and AF power amplifi er, and amplify and fi lter 15, 1) then applied to the VR-A UNIT.
  • Page 12 4-2 TRANSMITTER CIRCUITS TX AF CIRCUITS The MIC AMP is included to an IDC circuit which reduces The TX AF circuits consist of microphone amplifi er (MIC its gain automatically when the high amplitude (=loud AMP), MIC mute SW, IDC circuit and AF fi lters. The IDC voice) signals are applied to the microphone, to prevent (Instant Deviation Control) circuit is an amplifier which over deviation.
  • Page 13 TX AMPs APC CIRCUIT The TX amplifi ers consist the YGR and power amplifi ers, and The APC (Automatic Power Control) circuit stabilizes transmit output power to prevent the transition of transmit output amplify the TX/CH70-RX VCO output to the transmit output power level, which is caused by load mismatching or heat power level.
  • Page 14 4-3 FREQUENCY SYNTHESIZER CIRCUITS • RX VCO (Q72, D51–53) VCOs The RX VCO oscillates 134.300 to 141.725 MHz LO signals A VCO is an oscillator whose oscillating frequency is for MAIN-RX. The generated 1st LO signals are applied to controlled by the applied voltage. This transceiver has the 1st mixer (Q22) via the buffer AMPs (Q74, 76), LPF two VCOs;...
  • Page 15 PLL (Phase Locked Loop) CIRCUIT The frequency-matched signals (VCO output and the The PLL circuit provides stable oscillation for both of the reference frequency signals) are applied to the phase TX and 1st LO frequencies. By comparing fed back VCO comparator and phase-compared.
  • Page 16 4-5 CPU (LG; IC1) PORT ALLOCATION Pin No. LINE DESCRIPTION PSTB Strobe signal to the PLL IC (M: IC1). Clock signal to the PLL IC (M: IC1). PDATA Serial data to the PLL IC (M: IC1). PSPS Power control signal to the PLL IC (M: IC1) for RX VCO loop. (GND level) PMPS Power control signal to the PLL IC (M: IC1) for TX/CH70-RX VCO loop.
  • Page 17 SECTION 5 ADJUSTMENT PROCEDURE 5-1 PREPARATION ¤ REQUIRED INSTRUMENTS INSTRUMENT SPECIFICATION INSTRUMENT SPECIFICATION Output voltage : 13.8 V DC Input impedance : More than 50 kΩ Power Supply Digital Voltmeter Current capacity : More than 10 A Measuring range : 0.1–10V Measuring range : 0.1–30 W Frequency range...
  • Page 18 5-2 ADJUSTMENT ADJUSTMENT ADJUSTMENT ADJUSTMENT OPERATION VALUE CONDITION POINT LOCK VOLTAGE 1 • Channel : 16 • Connect a Digital voltmeter to the CP2 1.1–2.1 V VERIFICATION • Receiving (MAIN-A UNIT). (Verify) (MAIN-RX) (CH70-RX) 2 • Receiving • Connect a Digital voltmeter to the CP1 (MAIN-A UNIT).
  • Page 19 SECTION 6. PARTS LIST [MAIN-A UNIT] [MAIN-A UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION 1130013980 S.IC MB15F72ULPFT 50.6/30.7 6200013340 S.COI MLG1608S R12J-T 105.3/31.6 1110003201 S.IC TA31136FNG(EL) 35.3/22.4 6200009560 S.COI MLG1608B R10J-T 53.6/79.9 1150002470 IC RA33H1516M1-225 6110001670 COI LA-253 1140013200 S.IC CD4053BPWR 83.5/27.8 6170000231 COI...
  • Page 20 [MAIN-A UNIT] [MAIN-A UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION R155 7030003680 S.RES ERJ3GEYJ 104 V (100K) 107.3/50.0 R432 7030003600 S.RES ERJ3GEYJ 223 V (22K) 44.8/18.3 R171 7030003680 S.RES ERJ3GEYJ 104 V (100K) 106.0/46.2 R433 7030003560 S.RES ERJ3GEYJ 103 V (10K) 42.2/15.9 R172 7030003680 S.RES ERJ3GEYJ 104 V (100K)
  • Page 21 [MAIN-A UNIT] [MAIN-A UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION 4030017730 S.CER C1005 JB 1H 471K-T 58.0/40.8 C215 4030016930 S.CER C1005 JB 1A 104K-T 104.5/19.1 4030017380 S.CER C1005 CH 1H 050B-T 60.8/42.6 C216 4030016930 S.CER C1005 JB 1A 104K-T 102.3/18.7 4030017400 S.CER C1005 CH 1H 220J-T 62.0/37.5 C217...
  • Page 22 [MAIN-A UNIT] [MAIN-A UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION C462 4030017440 S.CER C1005 CH 1H 221J-T 10.5/65.9 7030012290 JUM RDS2T0R0 C463 4030017460 S.CER C1005 JB 1H 102K-T 4.2/79.7 8900017750 CAB OPC-1882 <TJM> C464 4030017730 S.CER C1005 JB 1H 471K-T 4.2/78.7 8900016880 CAB OPC-1768 (P0.5N40L65) <TJM>...
  • Page 23 [LOGIC-A UNIT] [LOGIC-A UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION 1140015612 S.IC UPD78F1154AGK(R)-GAK-AX 4030017420 S.CER C1005 CH 1H 470J-T 28.9/46.6 (3054C2 65.5/21.5 4030017400 S.CER C1005 CH 1H 220J-T 30.8/46.6 1110006380 S.IC LM2904PWR 103.9/13.6 4030016930 S.CER C1005 JB 1A 104K-T 35.5/40.4 1130014800 S.IC R1EX24064ATA00A 42.2/18.2...
  • Page 24 [VR-A UNIT] [SQL-A UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION 7210003140 VAR TP96N97N-15SK-10KA-2685 7210003150 VAR TP96N97-15SK-10KB-2685 6510009381 CON B5B-ZR(LF)(SN) 6510009471 CON S3B-ZR(LF)(SN) M.=Mounted side (T: Mounted on the Top side, B: Mounted on the Bottom side) S.=Surface mount 6 - 6...
  • Page 25 SECTION 7 MECHANICAL PARTS [FRONT-A UNIT] [MAIN-A UNIT] ORDER ORDER DESCRIPTION QTY. DESCRIPTION QTY. 6510024601 S5B-PH-K-S (LF) (SN) 7070001220 3.9 ERX2SJ 6510022471 40FLT-SM2-TB (LF) (SN) 0800009280 HM-164B (#01) 7120000470 ERDS2T0 8900012401 OPC-1264A 2510001350 045P0806-7-1 8900016880 OPC-1768 7120000470 ERDS2T0 MP1* 8510011111 1922 VCO CASE-1 8510011101 1922 VCO COVER-1 8210026560 3054 FRONT PANEL (E)ASS.Y MP3*...
  • Page 26 MP17 (C) MP16 (C) MP4 (C) MP6 (C) MP14 (C) Unit: mm J1 (C) MP12 (C) MP5 (C) MP7 (C) MP47 (C) MP17 (C) MP1 (C) MP11 (C) MP13 (FR) MP11 (FR) 28.3 111.2 14.2 MP8 (C) MP11 (MA) EP2 (LG) W1 (C) MP4 (LG) MP2 (LG)
  • Page 27 SECTION 8 BOARD LAYOUTS • LOGIC-A UNIT (TOP VIEW) ANT CONNECTOR J1 (CHASSIS) • MAIN-A UNIT (TOP VIEW) RF PA module R126 (IC3) C355 C129 RFin RFout C121 C115 C128 C373 C380 C368 R102 R122 R112 C463 C124 C127 C464 C138 R100 R112...
  • Page 28 • LOGIC-A UNIT (BOTTOM VIEW) • MAIN-A UNIT C107 C110 C125 ICF3 R104 (BOTTOM VIEW) R102 DSCENC CH16 DTRS MENU BPFV TMUTE TXDET DOWN B7428A SEND SCAN SQLV • SQL-A UNIT VBIAS • VR-A UNIT (BOTTOM VIEW) BPFV (BOTTOM VIEW) DETM TMUTE B7429A...
  • Page 29 SECTION 9 BLOCK DIAGRAM HM-164B FI3:LTM450EW X2:JTB450C24 Frequency range CERAMIC KEYM KEYM MAIN-RX :156.000-161.450MHz MAIN-RX:156.000-163.425MHz ICF3 FI1:FL-368 MAIN-A UNIT CH70-RX:156.525MHz BPFV FI2:FL-412 Q21:3SK131 FRONT-A UNIT Q22:3SK293 EXT SP XTAL 2ND IF AM P AM P IC9:LA4425A INT SP Q23:KTC3880S 21.7MHz D26,D27,D28: 1SV214x3 AM P...
  • Page 30 SECTION 10 VOLTAGE DIAGRAM LOGIC-A UNIT HR90 HR91 SEG0 SEG0 SEG1 SEG1 SEG2 SEG2 SEG3 SEG3 100K SEG4 SEG4 SEG5 SEG5 SEG6 LSCL LSCL CLRXD SEG6 SEG7 SEG7 4.7K DB2J3130 SEG8 SEG8 SEG9 SEG9 SEG10 SEG10 SEG11 SEG11 SEG12 SEG12 DTC144TU SEG13 SEG13...
  • Page 31 MAIN-A UNIT (Left side) to DC POWER IC10 CP18 KIA7805API-U/PF KTC4075 CP19 VCO5V 3.9V 0.25-1.9-8TL NLV32T 2.35V 2.3V MA2S077G0 1.5P 2SC4215 0.75P 2SC4226 C351 R353 C353 EP403 C356 EP341 LA4425A 3.14V 470K MMZ1608Y301C MPZ1608S221A CP16 KRC404 MA2S077G0 to EXT SP R354 R357 R651...
  • Page 32 MAIN-A UNIT (Right side) KTA2015 RA33H1516M1-225 TX:4.95V TX:4.95V R382 R125 C126 LW-25A L308CCB 0.001 LA-243 LA-243 CP15 C128 to ANT ERJ3GE-JPW LA-253 CP20 0.001 R102 2SC4226 KTA2015 MA2S077G0 LA-243 KRC404 R100 R388 100K SEND KRC404 RX:5.0V KRC404 R127 KTA2015 100K R109 R111 KTA1664...
  • Page 33 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, Altira Park, Herne Bay, Kent CT6 6GZ, UK Phone : +44 (01227) 741741...
  • Page 34 S-14709XZ-C1 1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan © 2010 Icom Inc.
  • Page 35 Oct. 2010 SERVICE MANUAL ADDENDUM CONTENTS PARTS LIST ....... . 1 BOARD LAYOUTS .
  • Page 36 Oct. 2010 SECTION 6. PARTS LIST [MAIN-A UNIT] [MAIN-A UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION 1130013980 S.IC MB15F72ULPFT 50.6/30.7 6200013340 S.COI MLG1608S R12J-T 105.3/31.6 1110003201 S.IC TA31136FNG(EL) 35.3/22.4 6200009560 S.COI MLG1608B R10J-T 53.6/79.9 1150002470 IC RA33H1516M1-225 6110001670 COI LA-253 1140013200 S.IC CD4053BPWR 83.5/27.8...
  • Page 37 Oct. 2010 [MAIN-A UNIT] [MAIN-A UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION R155 7030003680 S.RES ERJ3GEYJ 104 V (100K) 107.3/50.0 R432 7030003600 S.RES ERJ3GEYJ 223 V (22K) 44.8/18.3 R171 7030003680 S.RES ERJ3GEYJ 104 V (100K) 106.0/46.2 R433 7030003560 S.RES ERJ3GEYJ 103 V (10K) 42.2/15.9 R172 7030003680 S.RES ERJ3GEYJ 104 V (100K)
  • Page 38 Oct. 2010 [MAIN-A UNIT] [MAIN-A UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION 4030017730 S.CER C1005 JB 1H 471K-T 58.0/40.8 C215 4030016930 S.CER C1005 JB 1A 104K-T 104.5/19.1 4030017380 S.CER C1005 CH 1H 050B-T 60.8/42.6 C216 4030016930 S.CER C1005 JB 1A 104K-T 102.3/18.7 4030017400 S.CER C1005 CH 1H 220J-T 62.0/37.5...
  • Page 39 Oct. 2010 [MAIN-A UNIT] [MAIN-A UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION C462 4030017440 S.CER C1005 CH 1H 221J-T 10.5/65.9 7030012290 JUM RDS2T0R0 C463 4030017460 S.CER C1005 JB 1H 102K-T 4.2/79.7 8900017750 CAB OPC-1882 <TJM> C464 4030017730 S.CER C1005 JB 1H 471K-T 4.2/78.7 8900016880 CAB OPC-1768 (P0.5N40L65) <TJM>...
  • Page 40 Oct. 2010 [LOGIC-A UNIT] [LOGIC-A UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION 1140015612 S.IC UPD78F1154AGK(R)-GAK-AX 4030017420 S.CER C1005 CH 1H 470J-T 28.9/46.6 (3054C2 65.5/21.5 4030017400 S.CER C1005 CH 1H 220J-T 30.8/46.6 1110006380 S.IC LM2904PWR 103.9/13.6 4030016930 S.CER C1005 JB 1A 104K-T 35.5/40.4 1130014800 S.IC R1EX24064ATA00A...
  • Page 41 Oct. 2010 [VR-A UNIT] [SQL-A UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION 7210003420 VAR F09117S-6 A10K L15KQ 7210003430 VAR F09117N-8 B10K L15KQ 6510009381 CON B5B-ZR(LF)(SN) 6510009471 CON S3B-ZR(LF)(SN) M.=Mounted side (T: Mounted on the Top side, B: Mounted on the Bottom side) S.=Surface mount...
  • Page 42 Oct. 2010 SECTION 8 BOARD LAYOUTS • LOGIC-A UNIT (TOP VIEW) ANT CONNECTOR J1 (CHASSIS) • MAIN-A UNIT (TOP VIEW) RF PA module R126 (IC3) C355 C129 RFin RFout C121 C115 C128 C373 C380 C368 R102 R122 R112 C463 C124 C127 C464 C138...
  • Page 43 Oct. 2010 • LOGIC-A UNIT (BOTTOM VIEW) • MAIN-A UNIT C107 C110 C125 ICF3 R104 (BOTTOM VIEW) R102 DSCENC CH16 DTRS MENU BPFV TMUTE TXDET DOWN B7428A SEND SCAN SQLV VBIAS • SQL-A UNIT • VR-A UNIT (BOTTOM VIEW) BPFV (BOTTOM VIEW) DETM TMUTE...
  • Page 44 Oct. 2010 SECTION 10 VOLTAGE DIAGRAM LOGIC-A UNIT SEG0 SEG0 SEG1 SEG1 SEG2 SEG2 SEG3 SEG3 100K SEG4 SEG4 SEG5 SEG5 SEG6 LSCL LSCL CLRXD SEG6 SEG7 SEG7 4.7K DB2J3130 SEG8 SEG8 SEG9 SEG9 SEG10 SEG10 SEG11 SEG11 SEG12 SEG12 DTC144TU SEG13 SEG13...
  • Page 45 Oct. 2010 SECTION 10 VOLTAGE DIAGRAM CP18 KTC4075 MAIN-A UNIT (Left side) VCO5V 3.9V To DC POWER CP19 0.25-1.9-8TL NLV32T 2.35V IC10 KIA7805API-U/PF 2.3V MA2S077G0 1.5P 2SC4215 0.75P 2SC4226 C351 R353 C353 EP403 C356 EP341 LA4425A 3.14V 470K MMZ1608Y301C MPZ1608S221A CP16 KRC404 MA2S077G0...