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Icom IC-M401EURO Service Manual

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SERVICE
MANUAL
VHF MARINE TRANSCEIVER

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Summary of Contents for Icom IC-M401EURO

  • Page 1 SERVICE MANUAL VHF MARINE TRANSCEIVER...
  • Page 2 16 V. This will ruin the time of publication. transceiver. 2 versions of the IC-M401EURO have been designed. This service manual covers each version. DO NOT expose the transceiver to rain, snow or any liquids.

  • Page 3: Table Of Contents

    IC-M401EURO ........
  • Page 4 SECTION 1 SPECIFICATIONS ‘ ‘ GENERAL • Frequency coverage : 156.025–157.425 MHz (Tx) 156.300–162.025 MHz (Rx) • Mode : 16K0G3E (FM) • Power supply requirement : 13.8 V DC (negative ground) • Usable temperature range : –20˚C to +60˚C; –4˚F to +140˚F •...

  • Page 5: Vhf Marine Channel List

    ‘ ‘ VHF MARINE CHANNEL LIST Channel No. Frequency (MHz) Channel No. Frequency (MHz) Channel No. Frequency (MHz) Transmit Receive Transmit Receive Transmit Receive 156.050 160.650 157.100 161.700 156.675 156.675 156.050 156.050 157.100 157.100 156.725 156.725 156.100 160.700 157.150 161.750 156.775 156.775 156.150...
  • Page 6 SECTION 2 INSIDE VIEWS • MAIN UNIT AF power amplifier Pre-driver (IC9: LA4425A) (Q10: 2SC3775 3) Reference oscillator (X2: CR-659) YGR amplifier Antenna switching circuit (Q11: 2SC3268) VCO circuit 1st mixer (Q1:3SK272) FM IF IC (IC1: TA31136FN) 2nd IF filter (FI3: CFWS45QF) 1st IF filter PLL IC...

  • Page 7: Disassembly Instructions

    SECTION 3 DISASSEMBLY INSTRUCTIONS • • REMOVING THE CASE REMOVING THE MAIN UNIT ¡ Unscrew 6 screws, A. ¡ Remove the shield cover. Note: When replacing the screw, 10–12 kg of torque MUST ™ Unsolder DC cable (4 points) and antenna connector, B (2 points), as shown below.

  • Page 8: Circuit Description

    SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS The signals from the RF circuit are mixed with the VCO sig- nals at the 1st mixer circuit (Q1) to produce a 21.7 MHz 1st 4-1-1 ANTENNA SWITCHING CIRCUIT IF signal. (MAIN UNIT) The antenna switching circuit functions as a low-pass filter The 1st IF signal is applied to two crystal filters (FI1, FI2) to while receiving and as resonator circuit while transmitting.

  • Page 9: Transmitter Circuits

    4-1-5 AF AMPLIFIER CIRCUIT The amplified signals are passed through the MIX circuit (IC10A, pins 2, 1) to do amplitude limiting. and are then (MAIN AND FRONT UNITS) applied to the splatter filter (IC10B, pin 5) to suppress The AF amplifier circuit amplifies the detected signals to unwanted 3 kHz or higher signals.

  • Page 10: Pll Circuits

    4-3 PLL CIRCUITS 4-3-2 TX AND RX LOOP (MAIN UNIT) The generated signal at the VCO (Q4, Q5, Q6, D1–D4) 4-3-1 GENERAL enters the PLL IC (IC2, pin 2) and is divided at the pro- The PLL circuit provides stable oscillation of the transmit fre- grammable divider section and is then applied to the phase quency and receive 1st LO frequency.

  • Page 11: Atis And Dsc Circuits

    4-4 ATIS AND DSC CIRCUITS 4-6 POWER SUPPLY CIRCUITS 4-4-1 ATIS ENCODE CIRCUIT ([HOL], [FRG] ONLY) VOLTAGE LINES (LOGIC BOARD AND MAIN UNIT) LINE DESCRIPTION The FSK signal of ATIS created at CPU (IC1) is passed The voltage from the connected DC power sup- through the ladder type D/A convertor (R55–R73) to convert ply.

  • Page 12: Port Allocations

    4-7 PORT ALLOCATIONS 4-7-1 CPU (LOGIC BOARD; IC1) Port Port Description Description number name number name Outputs control signal for the LCD Input port for the HM-132 functions. contrast. 2.02 V: [UP] is pushed. KEYM CONT1 3.00 V: [DN]] is pushed. CONT2 CONT1 CONTRAST...

  • Page 13: Adjustment Procedures

    SECTION 5 ADJUSTMENT PROCEDURES 5-1 PREPARATION REQUIRED TEST EQUIPMENT EQUIPMENT GRADE AND RANGE EQUIPMENT GRADE AND RANGE Output voltage : 13.8 V DC Frequency range : 300–3000 Hz DC power supply Audio generator Current capacity : 10 A or more Measuring range : 1–500 mV Measuring range...

  • Page 14: Pll Adjustments

    5-2 PLL ADJUSTMENTS ADJUSTMENT MEASUREMENT POINT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION UNIT ADJUST LOCK • Operating channel : ch16 MAIN Connect a digital 1.8 V Verify VOLTAGE • Receiving multi-meter or oscil- loscope check point CP1. • Operating channel : ch16 1.6 V •...

  • Page 15: Transmitter Adjustments

    5-3 TRANSMITTER ADJUSTMENTS ADJUSTMENT MEASUREMENT POINT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION UNIT ADJUST OUTPUT • Operating channel : ch16 Rear Connect 22.5 W MAIN POWER • Output power : High Panel power meter to the • Transmitting antenna connector. FREQUENCY •...
  • Page 16 Output power adjustment R138 Frequency deviation adjustment Squelch level adjustment Squelch level check point Audio generator [PTT] 300 Hz to 3 kHz AC millivoltmeter 2 200 mV 5 - 4...

  • Page 17: Ic-M401Euro

    SECTION 6 PARTS LIST 6-1 IC-M401EURO [LOGIC BOARD] [LOGIC BOARD] ORDER ORDER DESCRIPTION DESCRIPTION 1140009810 S.IC HD6473847RH 7030004120 S.RESISTOR ERJ3GEYJ 203 V (20 kΩ) 1130009680 S.IC HN58X2432TI 7030004120 S.RESISTOR ERJ3GEYJ 203 V (20 kΩ) 1130007570 S.IC BU4094BCFV-E2 7030004120 S.RESISTOR ERJ3GEYJ 203 V (20 kΩ) 1130005290 S.IC...

  • Page 18: Vr-A Board

    [VR-A BOARD] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 7210002350 VARIABLE TP96N97N15F-10KA-1301 1790001210 S.DIODE 1SS375-TL 1750000550 S.DIODE 1SS355 TE-17 1790000620 S.DIODE MA77 (TX) 8900010820 CABLE OPC-1099 1790000620 S.DIODE MA77 (TX) 1790000660 S.DIODE MA728 (TX) 0910054112 PCB B 5585B 2010002420 MONOLITH 21R15AB (FL-310) 2010002420 MONOLITH 21R15AB (FL-310) 2020001520 CERAMIC...
  • Page 19 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 7030003600 S.RESISTOR ERJ3GEYJ 223 V (22 kΩ) R155 7030003560 S.RESISTOR ERJ3GEYJ 103 V (10 kΩ) ERJ3GEYJ 470 V (47 Ω) 7030003470 S.RESISTOR ERJ3GEYJ 182 V (1.8 kΩ) R157 7030003280 S.RESISTOR ERJ3GEYJ 561 V (560 Ω) ERJ3GEYJ 101 V (100 Ω) 7030003410 S.RESISTOR R158...
  • Page 20 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 4030006850 S.CERAMIC C1608 JB 1H 471K-T-A C162 4030011600 S.CERAMIC C1608 JB 1C 104KT-N 4550006130 S.TANTALUM ECST1VY224R C164 4030009490 S.CERAMIC C1608 JB 1H 821K-T-A 4030006860 S.CERAMIC C1608 JB 1H 102K-T-A C165 4030006880 S.CERAMIC C1608 JB 1H 472K-T-A 4030007090 S.CERAMIC C1608 CH 1H 470J-T-A...
  • Page 21 6-2 MH-132 [MAIN UNIT] [MAIN UNIT] ORDER DESCRIPTION ORDER DESCRIPTION C261 4030006860 S.CERAMIC C1608 JB 1H 102K-T-A C262 4030007090 S.CERAMIC C1608 CH 1H 470J-T-A 7010006890 RESISTOR R20J 12 kΩ C264 4030007090 S.CERAMIC C1608 CH 1H 470J-T-A 7010006880 RESISTOR R20J 6.8 kΩ C265 4030007090 S.CERAMIC C1608 CH 1H 470J-T-A...

  • Page 22: Logic Board

    SECTION 7 MECHANICAL PARTS AND DISASSEMBLY 7-1 IC-M401EURO [CHASSIS PARTS] [LOGIC BOARD] REF. NO. ORDER NO. QTY. REF. NO. ORDER NO. QTY. DESCRIPTION DESCRIPTION 5030001950 LCD TTR5341 6510004880 Connector MR-DSE-01 8930054970 LCD contact SRCN-2438-SP-N-W 8900010710 Cable OPC-1087 8900010490 Cable OPC-1041...
  • Page 23 MP27 (C) MP23 (C) MP24 (C) MP17 (C) MP28 (C) MP13 (C) MP7 (C) J1 (C) MP18 (C) MP5 (C) MP11 (C) MP18 (C) MP8 (C) MP18 (C) MP14 (C) MP4 (C) W2 (C) MP18 (C) MP18 (C) MP13 (C) MP20 (C) MP6 (F) W1 (C)
  • Page 24 8610010870 2352 hanger knob MP10 8310048760 2352 R-plate MP11 8310048780 2352 MIC plate MP12 8820001150 2352 screw MP13 8850001850 ICOM washer (Y) MP14 8930052340 O-ring (AE) MP15 8930052350 O-ring (AF) MP16 8930056460 2449 MIC sheet MP17 8930054910 2449 SP Rubber...
  • Page 25 SECTION 8 SEMI-CONDUCTOR INFORMATION • • TRANSISTOR AND FET’S DIODES 1SS355 1SS375 DA204 U DSA3A1 2SA1576 R 2SA1588 GR 2SB1132 R 2SB1202 S 2SC2714 Y HSM88ASR (Symbol: BAR) (Symbol: B1202) (Symbol: QY) (Symbol: A) (Symbol: FH) (Symbol: K) (Symbol: C3) (Symbol: FR) (Symbol: ZG) green...
  • Page 26 SECTION 9 BOARD LAYOUTS 9-1 VR-A BOARD 9-3 HM-132 to Main unit J5 • TOP VIEW B-5585B 9-2 VR-B BOARD • BOTTOM VIEW to Main unit J5 B-5586B 9 - 1...
  • Page 27 9-4 LOGIC BOARD • TOP VIEW B5679A ICOM to Front unit SP1 to Front unit SP1 From HM-132 to DSC terminal DS-100 to Main unit J6 9 - 2...
  • Page 28 • BOTTOM VIEW 9 - 3...

  • Page 29: Main Unit

    C190 R158 R155 VR-A/B R147 C227 C179 C228 R190 C256 C178 C225 R146 R145 C177 ICOM C138 R100 IC12 [SQL] C139 R101 C277 C120 C121 B-5678B to VR-A, VR-B boards to DSC terminal DS-100 to HM-132 to Logic unit J4...
  • Page 30 • BOTTOM VIEW R208 C280 C111 C102 C109 C197 C104 C107 C118 C281 R134 C272 C255 C278 C217 C262 C261 C165 R132 C166 R133 R195 C237 R174 R196 C222 R194 R175 R176 R193 C235 C234 C233 R212 C236 R171 C155 C299 R211 R177...
  • Page 31 SECTION 10 BLOCK DIAGRAM FRONT UNIT MAIN UNIT FI3: CFWS45QF CERAMIC BPFV IC1: EXT.SP OPTION TA31136FN D10: XB15A308 F11: FL310 EXTERNAL SPEAKER 2SC2714 Y D15: XB15A308 Q27: 2SC4226 R25 F12: FL310 3SK272 2nd IF XTAL HM-132 Q10: Q11: IC3: 2SC3775 3 2SC3268 SC-1302 D8, D9: HSM88ASR...

  • Page 32: Logic Board

    SECTION 11 VOLTAGE DIAGRAM 11-1 LOGIC BOARD R20 18 k DIM3 TTR5341 2SB1132 R CH16 CH16 SEG26 10 k SEG27 12 k 39 k SEG12 100 k 100 k 100 k 100 k 18 k SEG13 FY1101 F-TR DIM2 BAND EXTENTION 2SC4116 BL 2SC4116 BL SEG14...

  • Page 33: Main Unit

    11-2 MAIN UNIT C299 580mVp-p at 3kHz DEV IC13 RX: 3.07 V R158 100 NJM2125F R210 10 k CDBCA450CX24 0.01 C226 L28 82 nH R215 C252 0.10 H 470 P R155 12 k 1.5 k 0.001 0.22 0.001 R25 100 100 P R214 33 k...
  • Page 34 11-3 HM-132 470 P 12 k CHASSIS UNIT W1 MICG MICG to MAIN unit J4 PTTG 6.8 k KEYM to LOGIC board J3 15 k UP_ON 2.0V DN_ON 3.0V 16/9_ON 3.8V 33 k 16/9...
  • Page 35 Icom (UK) Ltd. : http://www.icomcanada.com Unit 9, Sea St., Herne Bay, Kent, CT6 8LD, U.K. Phone : 01227 741741 Fax : 01227 741742 Icom (Australia) Pty. Ltd. : http://www.icomuk.co.uk A.B.N. 88 006 092 575 Icom France S.a 290-294 Albert Street, Brunswick, Victoria, 3056, Australia...
  • Page 36 S-13808IZ-C1M 1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan © 2001 Icom Inc.

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