Icom IC-M504 Service Manual
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Icom IC-M504 Service Manual

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SERVICE
MANUAL
VHF MARINE TRANSCEIVER
S-14225HZ-C1-q
Dec. 2006

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Summary of Contents for Icom IC-M504

  • Page 1 SERVICE MANUAL VHF MARINE TRANSCEIVER S-14225HZ-C1-q Dec. 2006...
  • Page 2 8. READ the instructions of test equipment thoroughly before connecting equipment to the transceiver. Icom, Icom Inc. and logo are registered trademarks of Icom Incorporated (Japan) in 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 INSTRUCTIONS SECTION CIRCUIT DESCRIPITON RECEIVER CIRCUITS............4-1 TRANSMITTER CIRCUITS .
  • Page 4 SECTION 1 SPECIFICATIONS GENERAL • Frequency coverage : TX 156.025–157.425 MHz 156.050–163.275 MHz CH70 RX 156.525 MHz • Type of emission : 16K0G3E (FM), 16K0G2B (DSC) : 50 Ω (Nominal) • Antenna impedance • Operating temperature range : –4˚F to +140˚F •...

  • Page 5: Channel List

    • Channel list . y l , s l y l l c i l 1 - 2...
  • Page 6 SECTION 2 INSIDE VIEWS • LOGIC BOARD Dimmer control circuit Q1: 2SB1201 Q2, Q3: KTC4075 System clock oscillator (X1: CR-790A) Reset IC (IC4: S-80942CNMC-G9C) (IC1: M30622MEP-326GP) Photo coupler (IC6: PC357N6J000F) EEPROM (IC3: HN58X2464TI) • MAIN UNIT • AF UNIT AF power amplifier Antenna switch (IC9: LA4425A) (D14, D21: L308CCB)

  • Page 7: Disassembly Instructions

    SECTION 3 DISASSEMBLY INSTRUCTIONS • Removing the MAIN unit • Opening the transceiver case Unscrew 6 screws A. Disconnect the flat cable A from J2. Unsolder 14 points B. Disconnect 2 cables from J1 and J5. Unscrew 6 screws C, and remove the MAIN unit from the Remove the front unit.

  • Page 8: Circuit Descripiton

    SECTION 4 CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS The converted 1st IF signal is amplified by the 1st IF amplifier (Q22, Q23), and passed through two 1st IF filters (FI1, FI2) to 4-1-1 ANTENNA SWITCH (MAIN UNIT) filter out adjacent signals. The filtered 1st IF signal is amplified The received signals from the antenna connector are passed by the 1st IF amplifier (Q24), then applied to the FM IF IC (IC2, through the antenna switch which toggles the receive (RX)

  • Page 9: Transmitter Circuits

    4-1-6 SQUELCH CIRCUITS (MAIN UNIT) 4-2-2 MODULATION CIRCUIT (MAIN UNIT) Noise squelch circuit mutes AF output signals when no RF sig- The modulation circuit modulates the VCO oscillating signal nals are received. By detecting noise components (30 kHz and with the AF signals from the microphone. higher signals) in the demodulated AF signals, the squelch circuit switches the AF mute switch ON and OFF.

  • Page 10: Pll Circuits

    4-3-2 PLL CIRCUIT (MAIN UNIT) 4-3 PLL CIRCUITS The PLL circuit provides stable oscillation of the transmit and 4-3-1 VCO CIRCUITS (MAIN UNIT) receive 1st LO frequencies. The PLL output frequencies are A VCO (Voltage Controlled Oscillator) is an oscillator whose controlled by the divided ratio (N-data) from the CPU.

  • Page 11: Power Supply Circuits

    The converted 2nd IF signal is output from pin 3, and 4-4 DSC CRICUITS passed through the 2nd IF filter (FI6) to suppress sideband The DSC circuits monitors the DSC channel CH70 (156.525 MHz) noise. The filtered 2nd IF signal is applied to the limiter during stand-by.

  • Page 12: Port Allocations

    4-6 PORT ALLOCATIONS Port Description Name 4-6-1 CPU (LOGIC UNIT; IC1) Input port for PLL unlock signal from the PLL IC Port Description UNLK (MAIN UNIT; IC1, pin 7). Name "High"=While the PLL is unlocked. Outputs DSC encode signal to the LPF (AF DSENC Input port for optional unit attachement UNIT;...

  • Page 13: Adjustment Procedures

    SECTION 5 ADJUSTMENT PROCEDURES 5-1 PREPARATION ¤ REQUIRED TEST EQUIPMENTS EQUIPMENT GRADE AND RANGE EQUIPMENT GRADE AND RANGE Output voltage : 13.8 V DC DC power supply DC voltmeter Input impedance : 50 kΩ /V DC or better Current capacity : More than 7 A Measuring range : 0.1–30 W...

  • Page 14: Frequency Adjustment

    5-2 FREQUENCY ADJUSTMENT ADJUSTMENT MEASUREMENT ADJUSTMENT POINT ADJUSTMENT VALUE CONDITION UNIT LOCATION UNIT ADJUST LOCK 1 • Channel : CH16 (156.800 MHz) MAIN Connect a digital multi- 1.3–2.3 V MAIN Verify VOLTAGE • Receiving meter or oscilloscope to (Regular receive) the check point "CP2".

  • Page 15: Transmit Adjustment

    5-3 TRANSMIT ADJUSTMENT ADJUSTMENT MEASUREMENT POINT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION UNIT ADJUST TRANSMIT 1 • Channel : CH16 (156.800 MHz) Rear C o n n e c t a n R F 23–23.5 W MAIN R112 OUTPUT POWER •...

  • Page 16: Receive Adjustment

    5-4 RECEIVE ADJUSTMENT ADJUSTMENT MEASUREMENT POINT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION UNIT ADJUST → → → RECEIVE 1 • Channel : CH16 (156.800 MHz) MAIN Connect a DC volt Maximum MAIN L35 SENSITIVITY • [SQUELCH] : Max. counterclockwise meter or oscilloscope voltage (Repeate two times (Regular...
  • Page 17 SECTION 6 PARTS LIST [LOGIC BOARD] • IC-M504 [REPLACEMENT UNITS] ORDER DESCRIPTION LOCATION ORDER NO. UNIT NAME COLOR 7030003320 S.RES ERJ3GEYJ 101 V (100) 121.1/74.3 0329140101 U M504 #01 FRONT 7030003680 S.RES ERJ3GEYJ 104 V (100 k 121.9/56.1 (including HM-126B-3 ACC) BLACK 7030003680 S.RES ERJ3GEYJ 104 V (100 k...

  • Page 18: Main Unit

    [LOGIC BOARD] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION C338 4030017460 S.CER ECJ0EB1E102K 130.8/16.1 1790000620 S.DIO MA77 (TX) 58.3/32.3 C339 4030017460 S.CER ECJ0EB1E102K 145/16.4 1790000691 S.DIO HSM88ASRTR-E 49.9/49.8 1790000691 S.DIO HSM88ASRTR-E 42.4/42.5 C340 4030017760 S.CER ECJ0EB1H222K 112.5/14.4 C341 4030017730 S.CER ECJ0EB1E471K 110.5/14.4 1710001081 DIO L308CCB...
  • Page 19 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION R501 7030003560 S.RES ERJ3GEYJ 103 V (10 k 15.4/27.9 7030003410 S.RES ERJ3GEYJ 561 V (560) 84.1/42.7 R502 7030003620 S.RES ERJ3GEYJ 333 V (33 k 12.7/32.5 7030003420 S.RES ERJ3GEYJ 681 V (680) 85.4/43.2 R504 7030003280 S.RES ERJ3GEYJ 470 V (47)
  • Page 20 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION 4030017620 S.CER ECJ0EC1H100C 78/56.7 C390 4030016930 S.CER ECJ0EB1A104K 34.5/33.2 4030017620 S.CER ECJ0EC1H100C 78/58.6 C391 4030017460 S.CER ECJ0EB1E102K 107.7/41.8 C100 4550007520 S.TAN F931A106MAABMA 65.6/49.2 C392 4510008540 S.ELE EEE1CA100SR 40.2/29.4 C105 4030017460 S.CER ECJ0EB1E102K 64.3/56.2 C393 4510008540 S.ELE EEE1CA100SR...
  • Page 21 [AF UNIT] [AF UNIT] ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION R306 7030003800 S.RES ERJ3GEYJ 105 V (1 M 36.1/31.1 1130011770 S.IC CD4066BPWR 35.5/25.5 R307 7030003440 S.RES ERJ3GEYJ 102 V (1 k 61.1/19.2 1130011770 S.IC CD4066BPWR 78.5/24 R308 7030003770 S.RES ERJ3GEYJ 564 V (560 k 67.3/26.4 1130011770 S.IC CD4066BPWR...
  • Page 22 [AF UNIT] [AF UNIT] ORDER ORDER DESCRIPTION DESCRIPTION LOCATION LOCATION C571 4030016930 S.CER ECJ0EB1A104K 43.5/44.7 C251 4030016790 S.CER ECJ0EB1C103K 55.7/50 C572 4030017900 S.CER ECJ0EB1C123K 47.6/43.1 C260 4030017490 S.CER C1608 JB 1A 105K-T 82/27.8 C573 4030017040 S.CER ECJ0EB1A333K 42.6/40.4 C262 4030017460 S.CER ECJ0EB1E102K 66.3/53.4 C574 4030017040 S.CER ECJ0EB1A333K...
  • Page 23 SECTION 7 MECHANICAL PARTS AND DISASSEMBLY [CHASSIS PARTS] [AF UNIT] REF. ORDER REF. ORDER DESCRIPTION QTY. DESCRIPTION QTY. 6510004880 Connector MR-DS-E 01 8900015060 Cable OPC-1545 8900015050 Cable OPC-1544 8900015070 Cable OPC-1546 [LOGIC BOARD] 8900015080 Cable OPC-1547 8900015300 Cable OPC-1616 REF. ORDER DESCRIPTION QTY.
  • Page 24 MP5 (C) MP42 (C) MP42 (C) MP34 (C) MP1 (C) MP5 (C) MP42 (C) MP5 (C) W1 (A) MP42 (C) MP32 (C) MP5 (C) MP33 (C) MP3 (C) MP31 (C) LOGIC BOARD AF UNIT MP42 (C) MP19 (C) MP4 (C) W2 (C) MP18 (C) MP11 (F)
  • Page 25 XP6501 AB MP12 8820001150 2352 screw KTC2875-B (Symbol: MB) KTC4080 (Symbol: HH) (Symbol: M10) (Symbol: S3D) (Symbol: 5N) MP13 8850001850 ICOM washer (Y) KTC3880S (Symbol: HG) MP14 8930052340 O ring (AE) MP15 8930052350 O ring (AF) MP16 8930053870 2352 sheet (A)
  • Page 26 SECTION 9 BOARD LAYOUTS 9-1 AF UNIT 9-2 MAIN UNIT • TOP VIEW • TOP VIEW to CHASSIS CHASSIS J1 unit W1 to CHASSIS unit W3 to MAIN unit J1 SEND BPFV TMUTE TXDET DETM DET70 to CHASSIS unit W1 UNLK PSTB PDATA...
  • Page 27 • BOTTOM VIEW (MAIN UNIT) • BOTTOM VIEW (AF UNIT) to AF unit CP11-CP14 9 - 2...

  • Page 28: Hm-126B/G

    9-3 HM-126B/G 9-4 VR BOARD 9-5 SQL BOARD 9-6 DIAL BOARD • TOP VIEW • TOP VIEW • TOP VIEW • TOP VIEW VOLG DIALB VOL2 SQLV VOL1 DIALA to LOGIC to LOGIC board J3 board J3 to LOGIC board J3 9-7 LOGIC BOARD •...
  • Page 29 • BOTTOM VIEW (DIAL BOARD) • BOTTOM VIEW (SQL BOARD) • BOTTOM VIEW (VR BOARD) • BOTTOM VIEW (HM-126B/G) • BOTTOM VIEW (LOGIC BOARD) to LCD to CHASSIS unit W1 FRONT unit SP1 H155 H150 H145 H140 H135 H130 H125 H120 H115 H110...
  • Page 30 SECTION 10 BLOCK DIAGRAM VR BOARD IC11:NJM2211M Q38:KTC4075 VOL1 SPMUTE FI3:LT450EW X2:JTB450C24 MAIN UNIT VOL2 DSDM DETM CERAMIC 450kHz Q65: DECODER KTC2875 IC9:LA4425A BPFV WXDEC MUTE FI1:FL-368 FI2:FL-399 Q21:3SK292 D32:HSB88WS COMMON SQL BOARD IC15:NJM2211M IC12B:LM2904PWR IC12A:LM2904PWR XTAL 2ND IF DSD70 DATA DECODER Q24:KTC3880S...

  • Page 31: Front Unit (Inc. Logic/Dial/Sql/Vr Board's)

    SECTION 11 VOLTAGE DIAGRAMS 11-1 FRONT UNIT FRONT LOGIC BOARD unit IC10 3.3V TC74LCXR164245 3.3V 5.0V 1DIR LBAT HN58X2464TI RESETB RESETB 0.01 180k IC11 VCCB VCCA S-817B33AMC CS1B CS1B Explanatory notes EDATA CP22 3.3V VOLTAGE LINE VOUT TX LINE CP23 RX LINE EXTOE EDATA...

  • Page 32: Af Unit

    11-2 AF UNIT DSC5V DSC5V AF UNIT R583 4.9V 4.5V C586 R273 R274 R275 C573 IC15 0.033 KTC4075 0.033 NJM2211M R277 R581 C581 470k 0.01 C271 C274 C574 IC12 0.022 0.033 LOCK LM2904PWR LOOP R584 WXDEC 100k R573 R574 R575 DSD70 C571 DATA...

  • Page 33: Main Unit

    11-3 MAIN UNIT MAIN UNIT 4.93V Rx: 0V VCO5V Tx: 4.80V CHASSIS KTC4075 Rx: 1.95V Tx: 1.88V 4.26V R125 C126 2.7µ LW-25 L308CCB 0.001 LA-243 LA-243 CP15 MA77 1.5p MA77 LA-253 C128 CP20 2SC4226 0.75p 150p KTC4080 KTA2015 KRC404 2SC4226 LA-243 KTC4080 MA77...
  • Page 35 S-14225HZ-C1 1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan © 2006 Icom Inc.

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