Icom IC-M45 Service Manual
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Icom IC-M45 Service Manual

Vhf marine transceiver
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SERVICE
MANUAL
VHF MARINE TRANSCEIVER

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  • Page 1 SERVICE MANUAL VHF MARINE TRANSCEIVER...
  • Page 2 16 V. This will ruin the at the time of publication. transceiver. 2 versions of the IC-M45/IC-M45EURO have been designed. DO NOT expose the transceiver to rain, snow or any liquids. This service manual covers each version.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION SPECIFICATIONS VHF MARINE CHANNEL LIST ..........1-2 SECTION DISASSEMBLY INSTRUCTIONS SECTION...
  • Page 4 • Mode : 16K0G3E (FM) • Usable channels Channel Model Version USA CAN [USA] IC-M45 [USA-1] [ITA] IC-M45EURO [FRA] • Power supply requirement : 13.8 V DC ±15% (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 156.050 160.650 157.050 157.050 156.675 156.675 156.050 156.050 157.100 161.700 156.725 156.725 156.100 160.700 157.100 157.100 156.875 156.875 156.150...

  • Page 6: Disassembly Instructions

    SECTION 2 DISASSEMBLY INSTRUCTIONS • • REMOVING THE CASE REMOVING THE MAIN UNIT 1 Unscrew the 4 screws, A. 1 Unsolder DC cable (2 points) and antenna connector, B (3 points), as shown below. Note: When replacing the screw, 10–12 kg of torque MUST 2 Unscrew 2 screws, C, and 7 screws, D, to remove the be applied to ensure water resistance.

  • Page 7: Circuit Description

    SECTION 3 CIRCUIT DESCRIPTION 3-1 RECEIVER CIRCUITS 3-1-4 2ND IF AND DEMODULATOR CIRCUITS The 2nd mixer circuit converts the 1st IF signal to a 2nd IF 3-1-1 ANTENNA SWITCHING CIRCUIT signal. A double superheterodyne system (which converts The antenna switching circuit functions as a low-pass filter receive signals twice) improves the image rejection ratio and while receiving and as resonator circuit while transmitting.

  • Page 8: Transmitter Circuits

    When the weather alert function is activated and a 1050 Hz amplifier (IC2). alert tone from an NOAA weather radio broadcast is received, the IC-M45 emits beep tones and indicates flash- ing “ALT” on the display to inform of an emergency weather 3-2-4 POWER AMPLIFIER CIRCUIT report on the air.

  • Page 9: Pll Circuits

    3-3 PLL CIRCUITS The phase detector compares the input signal with a refer- ence frequency, and then outputs the out-of-phase signal 3-3-1 GENERAL (pulse-type signal) from pin 13. The PLL circuit provides stable oscillation of the transmit fre- quency and receive 1st LO frequency. The PLL circuit com- The pulse-type signal is converted into DC voltage (lock pares the phase of the divided VCO frequency to the refer- voltage) at the loop filter (R34, R37, R38, C64, C73), and...

  • Page 10: Port Allocations

    3-5 PORT ALLOCATIONS 3-5-1 CPU (LOGIC unit; IC1) 3-5-2 OUTPUT EXPANDER (MAIN unit; IC7) Port Port Description Description number name number name Input port for the connected power Outputs the R5 regulator (Q19, Q20) LBATT supply voltage detection (low voltage control signal.

  • Page 11: Adjustment Procedures

    SECTION 4 ADJUSTMENT PROCEDURES 4-1 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 12: Pll Adjustments

    4-2 PLL ADJUSTMENTS ADJUSTMENT MEASUREMENT POINT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION UNIT ADJUST LOCK • Operating channel : ch16 MAIN Connect a digital 2.6 V MAIN • Receiving multi-meter or oscil- VOLTAGE loscope check point CP1. • Operating channel : ch16 Connect a digital 2.8 V •...
  • Page 13 DC power supply – 13.8 V /15 A to DC cable Black Output power adjustment for [Low] Output power adjustment for [High] Sensitivity R130 adjustment Frequency deviation adjustment C117 Reference frequency PLL lock voltage adjustment check point for [RX] PLL lock voltage check point for [TX] Sensitivity check point...
  • Page 14 2SK210-GR (TE85R) 4030008630 S.CERAMIC C1608 JF 1C 104Z-T-A 1560000330 S.FET 2SK210-GR (TE85R) 4030006900 S.CERAMIC C1608 JB 1E 103K-T-A 1560000540 S.FET 2SK880-Y (TE85R) 4030006900 S.CERAMIC C1608 JB 1E 103K-T-A 1530002600 S.TRANSISTOR 2SC4215-O (TE85R) [USA]; IC-M45, [EUR]; IC-M45EURO S.=Surface mount 5 - 1...
  • Page 15 ERJ3GEYJ 473 V (47 kΩ) 7030003800 S.RESISTOR ERJ3GEYJ 105 V (1 MΩ) 7030003640 S.RESISTOR ERJ3GEYJ 473 V (47 kΩ) 7030003800 S.RESISTOR ERJ3GEYJ 105 V (1 MΩ) 7030003560 S.RESISTOR ERJ3GEYJ 103 V (10 kΩ) [USA]; IC-M45, [EUR]; IC-M45EURO S.=Surface mount 5 - 2...
  • Page 16 GRM42-6 CH 150J 500PT 4030006860 S.CERAMIC C1608 JB 1H 102K-T-A 4030011100 S.CERAMIC GRM42-6 CH 080D 500PT 4030007020 S.CERAMIC C1608 CH 1H 120J-T-A 4030011260 S.CERAMIC GRM42-6 W5R 102K 500PT 4030006860 S.CERAMIC C1608 JB 1H 102K-T-A [USA]; IC-M45, [EUR]; IC-M45EURO S.=Surface mount 5 - 3...
  • Page 17 C1608 JB 1H 102K-T-A C175 4030006860 S.CERAMIC C1608 JB 1H 102K-T-A C176 4030011340 S.CERAMIC C1608 CH 1H 471J-T-A C177 4030006900 S.CERAMIC C1608 JB 1E 103K-T-A C178 4030011730 S.CERAMIC GRM42-6 CH 101J 500PT [USA]; IC-M45, [EUR]; IC-M45EURO S.=Surface mount 5 - 4...

  • Page 18: Mechanical Parts And Disassembly

    SECTION 6 MECHANICAL PARTS AND DISASSEMBLY [CHASSIS PARTS] [MAIN UNIT] REF. NO. ORDER NO. QTY. REF. NO. ORDER NO. QTY. DESCRIPTION DESCRIPTION 8510011600 2040 VCO Case 6510004880 Connector MR-DSE-01 8510011590 2040 VCO Cover 8510011690 2040 Module plate [USA] 0800004370 Microphone HM-117B [Black] 8510011860 2040 A-Module plate [EUR]...
  • Page 19 MP20 (C) MP4 (C) MP20 (C) MP17 (C) DS2 (L) DS3 (L) MP17 (C) EP2 (L) MP19 (C) J1 (C) LOGIC UNIT MP2 (L) MP7 (C) SP1 (C) MP15 (C) MP1 (L) W1 (C) MP13 (C) MP21 (C) DS1 (L) MP8 (C) R1 (VB) VR-A UNIT...

  • Page 20: Semi-Conductor Information

    SECTION 7 SEMI-CONDUCTOR INFORMATION • TRANSISTOR AND FET’S 2SA1162 GR 2SB1132 Q 2SB1132 R 2SB1143 S 2SC2712 GR (Symbol: SR) (Symbol: BAQ) (Symbol: BAR) (Symbol: B1143) (Symbol: LG) 2SC2712 Y 2SC2714 Y 2SC2954 2SC3775 3 2SC4215 O (Symbol: LY) (Symbol: QY) (Symbol: QK) (Symbol: OY3) (Symbol: QO)

  • Page 21: Board Layouts

    SECTION 8 BOARD LAYOUTS 8-1 LOGIC, VR-A AND VR-B UNITS 8-1-1 TOP VIEW • LOGIC UNIT SP— SP— BEEP ICF3 HANG TXDET OEX. OE P. STB OEX.STB TONE S.METER PTT. S UNLK DATA KEY.M DATAM DATAS FROM SQLV MICROPHONE BUSY F.
  • Page 22 8-1-2 BOTTOM VIEW • LOGIC UNIT • • VR-B UNIT VR-A UNIT 8 - 2...

  • Page 23: Main Unit

    8-2 MAIN UNIT • TOP VIEW C164 C192 C103 C181 C207 C163 R140 FROM MICROPHON C189 DATAS C135 C144 OP.RST R156 R114 PTT.S R118 BUSY R130 R120 RMUT C186 ICF3 C191 DATAM C140 R129 C121 R127 R126 C123 FROM OPTIONAL C205 UNIT C177...
  • Page 24 • BOTTOM VIEW C127 C128 C165 R109 C173 C100 C175 R141 C130 C131 R134 C133 R113 C141 R115 C182 R119 C200 R136 C139 C190 C113 C111 C112 R117 R150 R148 R146 R149 R147 R151 C184 R157 C171 R135 R152 8 - 4...
  • Page 25 SECTION 9 BLOCK DIAGRAM HI/LO TMUT UNLK RMUT SEND 9 - 1...

  • Page 26: Logic Unit

    SECTION 10 VOLTAGE DIAGRAM 10-1 LOGIC UNIT from Microphone 10 - 1...

  • Page 27: Main Unit

    10-2 MAIN UNIT Rx: 2.2V TONE 1.5 k 0.001 100 k 0.47 H X2 CDBCA450CX24 C42 100 P 0.001 0.22 D5 1SS321 100 k FI1b FL-202 FI1a FL-202 R157 C199 68 P 0.001 0.001 0.01 L6 LS-491 0.001 22 k 820 k LA-253 C201...

  • Page 28: Vr-A And Vr-B Units

    10-3 VR-A AND VR-B UNITS VR-A UNIT VR-B UNIT SQLI SQLV SQLG 10 k SQLG SQLI SQLV VOL1 VOL2 VOL2 VOL1 10 k 10 - 3...
  • Page 29 290-294 Albert Street, Brunswick, Victoria, 3056, Australia : http://www.icomuk.co.uk Phone : 03 9387 0666 Fax : 03 9387 0022 : http://www.icom.net.au Zac de la Plaine, Rue Brindejonc des Moulinais BP 5804, 31505 Toulouse Cedex, France 6F No. 68, Sec. 1 Cheng-Teh Road, Taipei, Taiwan, R.O.C.
  • Page 30 S-13611IZ-CD 6-9-16, Kamihigashi, Hirano-ku, Osaka, 547-0002, Japan © 2000 Icom Inc.

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