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Icom iC-M501EURO Service Manual

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SERVICE
MANUAL
VHF MARINE TRANSCEIVER
iM501EURO

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Summary of Contents for Icom iC-M501EURO

  • Page 1 SERVICE MANUAL VHF MARINE TRANSCEIVER iM501EURO...
  • Page 2 TA31136FN IC-M501EURO MAIN UNIT 15 pieces 6. DO NOT transmit power into a signal generator or a 8810006050 Screw Icom screw E7 IC-M501EURO CHASSIS 10 pieces sweep generator. Addresses are provided on the inside back cover for your 7. ALWAYS connect a 40 dB to 50 dB attenuator between convenience.

  • Page 3: Table Of Contents

    IC-M501EURO ........
  • Page 4 SECTION 1 SPECIFICATIONS ‘ ‘ GENERAL • Frequency coverage : 156.025–157.425 MHz (Tx) 156.025–162.025 MHz (Rx) • Mode : 16K0G3E (FM) • Usable channels : All international and USA* channels *availability depending on version • Power supply requirement : 13.8 V DC (negative ground) •...
  • Page 5 ‘ ‘ VHF MARINE CHANNEL LIST Channel No. Frequency (MHz) Channel No. Frequency (MHz) Channel No. Frequency (MHz) Transmit Receive Transmit Receive Transmit Receive 156.050 160.650 157.000 161.600 156.375 156.375 156.050 156.050 157.000 157.000 156.425 156.425 156.100 160.700 157.050 161.650 156.475 156.475 156.100...

  • Page 6: Logic Unit

    SECTION 2 INSIDE VIEWS • MAIN UNIT AF power amplifier (IC14: LA4425A) PLL IC (IC2: µPD3140GS) VCO circuit Reference oscillator (X2: CR-659 21.25 MHz) Driver amplifier (Q12: 2SC2954) 1st IF filter (FI1, FI2: FL-310) Power module* (IC3: SC-1302) 2nd IF filter (FI3: ALFY450E) 1st mixer* FM IF IC...

  • Page 7: Optiononal Unit Installation

    SECTION 3 OPTIONAL UNIT INSTALLATION CAUTION: DISCONNECT the DC power cable from the transceiver before performing any work on the transceiver. Otherwise, there is danger of electric shock and/or equip- ment damage. • Opening the transceiver case Follow the case opening procedure shown here when you want to install an optional unit, etc.

  • 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 (Q3) to produce a 21.7 MHz 1st 4-1-1 ANTENNA SWITCHING CIRCUIT IF signal. The antenna switching circuit functions as a low-pass filter while receiving and as resonator circuit while transmitting.

  • Page 9: Transmitter Circuits

    4-1-5 AF AMPLIFIER CIRCUIT The amplified signals are applied to the IDC amplifier (IC13a, pin 2) via the analog switch (IC12, pins 8, 9 and pins The AF amplifier circuit amplifies the detected signals to 4, 3) and are passed through the splatter filter (IC13b) to drive a speaker.

  • Page 10: Pll Circuit

    4-3 PLL CIRCUITS The pulse-type signal is converted into DC voltage (lock voltage) at the loop filter (R252–R254, C292–C294), and is 4-3-1 GENERAL then applied to varactor diodes (D6, D7) of the TX-VCO to The PLL circuit provides stable oscillation of the transmit fre- stabilize the oscillated frequency.

  • Page 11: Dsc Circuit

    4-4 DSC CIRCUITS (DSC UNIT) • LOW BATTERY DETECTOR VCC voltage is divided by R204, R205 and is applied to the 4-4-1 DATA INTERFACE CIRCUIT low battery detector section in the MPU (IC16, pin 42). The control signals from DS-100 CLASS D/DSC TERMINAL are shaped waveform at the SCHMITT circuit (IC3) via the photo-coupler (IC2), and are then applied to the MAIN unit 4-6-2 LOGIC UNIT...
  • Page 12 4-7-2 MAIN CPU (MAIN unit; IC17) Port Port Description Description number name number name Outputs control signal to the analog Outputs serial data signal for EEP- switch (IC12) for passing through the ROM (IC17). STRU optional VOICE SCRAMBLER unit Outputs select signal to the analog (UT98 or UT-112).

  • 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 2.5 V MAIN VOLTAGE • Receiving multi-meter or oscil- loscope to check point CP1. • Operating channel : ch116 3.4–4.1 V Verify •...
  • Page 15 AC millivoltmeter [PTT] 2–200 mV – Audio generator 300 Hz to 3 kHz Lock voltage adjustment for TX Lock voltage check point for TX Reference frequency Lock voltage adjustment adjustment for RX Frequency deviation adjustment Output power adjustment Lock voltage check point for RX 5 - 3...

  • Page 16: Receiver Adjustments

    5-4 RECEIVER ADJUSTMENTS ADJUSTMENT MEASUREMENT POINT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION UNIT ADJUST SENSITIVITY • Operating channel : ch16 MAIN Connect a DC volt- Maximum voltage MAIN • [SQUELCH] control: meter to check point Max. counterclockwise CP3. • Set the internal speaker OFF in the SET mode, and connect a distortion meter with a 4 Ω...
  • Page 17 Squelch adjustment Receive sensitivity check point Receive sensitivity adjustment Squelch check point 5 - 5...

  • Page 18: Ic-M501Euro

    SECTION 6 PARTS LIST 6-1 IC-M501EURO [LOGIC UNIT] [LOGIC UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 1140008670 S.IC µPD78F9418AGK-9EU 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 kΩ) 1140008960 S.IC HD66712SA03FS 7030003590 S.RESISTOR ERJ3GEYJ 183 V (18 kΩ) 7030003560 S.RESISTOR ERJ3GEYJ 103 V (10 kΩ) 7030003630 S.RESISTOR...

  • Page 19: Main Unit

    [VOL UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 7210003080 VARIABLE TP96N97-15F-10KA-2345 1110003200 S.IC TA31136FN (EL) 1130007610 S.IC µPD3140GS-E1 (DS8) 1150001540 IC M57710-A/SC-1302 6510009470 CONNECTOR S3B-ZR 1110003750 S.IC M5218AFP 600C [HOL], [FRG] 1110003650 S.IC NJM2211M-TE1 [HOL], [FRG] 1130007420 S.IC TC7W14FU (TE12L) 7120000470 JUMPER ERDS2T0 [HOL], [FRG]...
  • Page 20 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 1750000550 S.DIODE 1SS355 TE-17 7030003660 S.RESISTOR ERJ3GEYJ 683 V (68 kΩ) ERJ3GEYJ 681 V (680 Ω) 1790000700 DIODE DSA3A1 7030003420 S.RESISTOR ERJ3GEYJ 101 V (100 Ω) 1750000130 S.DIODE DA204U T107 7030003320 S.RESISTOR ERJ3GEYJ 680 V (68 Ω) 1750000130 S.DIODE DA204U T107...
  • Page 21 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION R112 7030003560 S.RESISTOR ERJ3GEYJ 103 V (10 kΩ) R195 7410000950 S.ARRAY EXB-V8V 102JV R113 7030003480 S.RESISTOR ERJ3GEYJ 222 V (2.2 kΩ) R196 7410000950 S.ARRAY EXB-V8V 102JV R114 7030003560 S.RESISTOR ERJ3GEYJ 103 V (10 kΩ) R197 7030003440 S.RESISTOR ERJ3GEYJ 102 V (1 kΩ)
  • Page 22 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 4030006990 S.CERAMIC C1608 CH 1H 080D-T-A C103 4030006860 S.CERAMIC C1608 JB 1H 102K-T-A 4030009500 S.CERAMIC C1608 CH 1H 0R5B-T-A C104 4030006860 S.CERAMIC C1608 JB 1H 102K-T-A 4030007030 S.CERAMIC C1608 CH 1H 150J-T-A C105 4030006860 S.CERAMIC C1608 JB 1H 102K-T-A...
  • Page 23 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION C171 4510004630 S.ELECTROLYTIC ECEV1CA100SR C256 4510004630 S.ELECTROLYTIC ECEV1CA100SR C172 4030011600 S.CERAMIC C1608 JB 1C 104KT-N C257 4030011600 S.CERAMIC C1608 JB 1C 104KT-N C173 4030011600 S.CERAMIC C1608 JB 1C 104KT-N C258 4030011600 S.CERAMIC C1608 JB 1C 104KT-N C174 4510004630 S.ELECTROLYTIC...

  • Page 24: Dsc Unit

    [DSC UNIT] [PWR-CORD UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 1110003750 S.IC M5218AFP 600C 2040001440 S.LC NFM60R20T152 1170000280 S.IC TLP121 (GB-TPL) 2040001440 S.LC NFM60R20T152 1130007430 S.IC TC7S14FU (TE85R) 4030006860 S.CERAMIC C1608 JB 1H 102K-T-A 1590000660 S.TRANSISTOR DTC144TU T107 4030006900 S.CERAMIC C1608 JB 1E 103K-T-A 1530002850 S.TRANSISTOR 2SC4116-BL (TE85R) 4030006850 S.CERAMIC...
  • Page 25 6-2 HM-126 [MAIN UNIT] ORDER DESCRIPTION 7010004330 RESISTOR R20J 12 kΩ 7010004300 RESISTOR R20J 6.8 kΩ 7010004340 RESISTOR R20J 15 kΩ 7010004390 RESISTOR R20J 33 kΩ 7070000860 RESISTOR ERG2SJ 150 4010000460 CERAMIC DD104 B 471K 50V 6510003550 CONNECTOR S07B-EH-S 7700001600 MICROPHONE KUC2123-030245 2260000980 SWITCH SKHHLP014A...
  • Page 26 8810004540 MP12 8820001150 2352 screw MP40 8850000690 Flat washer M3 (3×7×0.5) SUS MP13 8850001850 ICOM washer (Y) MP41 8810006050 Icom screw E 7 MP14 8930052340 O-ring (AE) MP42 8830001490 2345 nut MP15 8930052350 O-ring (AF) MP43 8930052430 2345 A-IC Clip...
  • Page 27 MP41 (CH) MP40 (CH) J2 (CH) MP22 (CH) MP37 (CH) MP27 (CH) MP5 (CH) MP51 (CH) MP3 (CH) ANT UNIT MP2 (CH) MP32 (CH) W1 (CH) MP38 (CH) MP29 (CH) MP42 (CH) MP45 (CH) MP12 (CH) MP33 (CH) MP46 (CH) MP3 (M) MP31 (CH) PWR-CORD...
  • Page 28 SECTION 8 SEMI-CONDUCTOR INFORMATION • TRANSISTORS AND FET’S • DIODES 2SA1576A T106R 2SB1132 T100 R 2SB1143 S 2SC2714-Y 2SC2954 T2B 1SS355 1SS375-TL 1SV270 DA204 U DAP202 U (Symbol: A) (Symbol: FH) (Symbol: TF) (Symbol: K) (Symbol: P) (Symbol: FR) (Symbol: BARB) (Symbol: B1143) (Symbol: QY) (Symbol: QK)
  • Page 29 SECTION 9 BOARD LAYOUTS 9-1 LOGIC UNIT • TOP VIEW 9 - 1...
  • Page 30 • BOTTOM VIEW RESET STXD SRXD to HM-126 J2 to SQL and DIAL units to MAIN unit J4 9 - 2...
  • Page 31 9-2 MAIN UNIT • TOP VIEW EXT SP to HM-126 J1 to VR unit J1 for FLASH to OPTION UT-98 or UT-112 from DSC unit J3 from LOGIC unit J4 9 - 3...
  • Page 32 • BOTTOM VIEW 9 - 4...

  • Page 33: Vr Unit

    9-3 DSC UNIT 9-6 VR UNIT 9-7 SQL UNIT • TOP VIEW to LOGIC unit J3 to MAIN unit W1 9-8 DIAL UNIT to MAIN unit J3 9-4 ANT UNIT 9-5 PWR-CORD UNIT • TOP VIEW to MAIN unit to LOGIC unit J3 9 - 5...
  • Page 34 DN-ON 3.0V W1 (CHASSIS) H/L-ON 3.8V S36G04K-4 KEYM KEYM GREEN GREEN KEYM to LOGIC unit J1 KGND KGND BROWN BROWN KGND (IC-M501EURO) MICE MICE SPMIC SPMIC WHITE BLACK SKHHLP014A BLUE BLUE HANG HANG MICE to MAIN unit J7 (IC-M501EURO) BLACK 6.8k...
  • Page 35 SECTION 10 BLOCK DIAGRAM EXT.SP ALFY450E Q31 DTC144EU OPTION Q32 2SC4116 EXTERNAL SPEAKER ATTA ATTB TA31136FN D16, D17 IC4B FI1, FI2 3stage 1stage XB15A308 M5218AFP FL-310 2SC2714 3SK292 3SK166 WX ALERT 2nd IF HM-126 SPEAKER MIC IC4A IC5 NJM2211M Q18 2SC4116 M5218AFP IC6 TC7W14FU D14, D15 HSM88ASR...
  • Page 36 SECTION 11 VOLTAGE DIAGRAM 11-1 LOGIC UNIT DTRS SQL UNIT DISTRESS DS16 DS11 SML-311YT DS3–DS17 SQLG SML-311YT SQLV SQL5V SCAN DS15 DS12 DS10 TSD0393 CHWX SQL5V SQL5V CH16 SQLV SQLV SQLG SQLG DS14 DS13 DIALA DIALA SCAN CH/WX DIALB DIALB DIAL UNIT DIALB DS17...
  • Page 37 11-2 MAIN UNIT MAIN UNIT MAIN(1) TMODE TMODE TAUX3 TAUX3 DEMOD DEMOD PLL BUS BUS LINE OPT BUS MAIN BUS SQLI R199 100k R195 R182 RMUTS DTA144EU DTA144EU 455kHz IC15 RMUTM ATT1 ATT2 0.001 0.001 0.22 S-80928ANMP R200 CD 5 ATTB RESET 100k...
  • Page 38 MAIN(2) CHASSIS CHASSIS DEMOD BUS LINE C308 IC20 R263 NJM2125F R266 R268 4.66V SQLI C158 C317 R264 IC4B R265 R267 C309 R102 R103 R104 C307 ANT UNIT 100k M5218AFP C147 0.22 C161 0.22 DEMOD NJM2211M 0.033 CAP 14 C148 R109 CAP 13 C153 C156...
  • Page 39 Fax : ( 604 ) 952-0090 Icom (UK) Ltd. : http://www.icomcanada.com Unit 9, Sea St., Herne Bay, Kent, CT6 8LD, U.K. Icom (Australia) Pty. Ltd. Phone : 01227 741741 Fax : 01227 741742 A.B.N. 88 006 092 575 : http://www.icomuk.co.uk 290-294 Albert Street, Brunswick, Victoria, 3056, Australia Icom France S.a...
  • Page 40 S-13702HZ-CD-q © 2000 Icom Inc. 1-1-32, Kamiminami, Hirano-ku Osaka 547-0003, Japan...

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