Icom IC-M91D Service Manual Addendum
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Icom IC-M91D Service Manual Addendum

Icom IC-M91D Service Manual Addendum

Vhf marine transceiver
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August 2012
SERVICE MANUAL
ADDENDUM
CONTENTS
PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
BOARD LAYOUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
VOLTAGE DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . 8

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  • Page 1 August 2012 SERVICE MANUAL ADDENDUM CONTENTS PARTS LIST ....... . 1 BOARD LAYOUTS .
  • Page 2 August 2012 SECTION 5. PARTS LIST [MAIN UNIT] [MAIN UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION IC200 1110006470 S.IC LMV324IPWR 37.4/11.5 R343 7030005050 S.RES ERJ2GEJ 103 X (10K) 65.6/35.6 IC220 1180003480 S.REG NJU7772F33-TE1-#ZZZB 62.8/32.0 R351 7030005120 S.RES ERJ2GEJ 102 X (1K) 93.2/6.2 IC260 1130011770 S.IC...
  • Page 3 August 2012 [MAIN UNIT] [MAIN UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION C191 4030016790 S.CER C1005 JB 1E 103K-T 7.8/18.0 C608 4030016930 S.CER C1005 JB 1A 104K-T 102.9/20.8 C192 4030019560 S.CER GRM21BB31C106KE15L 39.0/20.0 C609 4030016930 S.CER C1005 JB 1A 104K-T 103.0/26.6 C193 4030016790 S.CER C1005 JB 1E 103K-T...
  • Page 4 August 2012 [RF UNIT] [RF UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION 1130016080 S.IC GP214D <SEI> 11.5/33.3 7030005240 S.RES ERJ2GEJ 473 X (47K) 6.7/35.2 1180003480 S.REG NJU7772F33-TE1-#ZZZB 16.4/34.1 7030005050 S.RES ERJ2GEJ 103 X (10K) 7.9/32.2 IC50 1120002830 S.IC NJM2125F-TE1-#FZZB 36.1/20.2 7030005120 S.RES ERJ2GEJ 102 X (1K) 12.0/39.6 IC170...
  • Page 5 August 2012 [RF UNIT] [RF UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION R545 7030003860 S.RES ERJ3GE JPW V [USA] B 4.5/26.1 4030017390 S.CER C1005 CH 1H 180J-T 45.8/25.9 7030003860 S.RES ERJ3GE JPW V [EXP] 4030017390 S.CER C1005 CH 1H 180J-T 45.6/24.1 7030003860 S.RES ERJ3GE JPW V [AUS]...

  • Page 6: Mic Unit

    August 2012 [RF UNIT] [MIC UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION 6910014690 S.BEA MPZ1608S221A-T [CHN] B 5.8/26.1 C410 4030017420 S.CER C1005 CH 1H 470J-T 2.8/9.0 6910014690 S.BEA MPZ1608S221A-T [EUR] C419 4030017620 S.CER C1005 CH 1H 100C-T 6.9/4.2 6910014690 S.BEA MPZ1608S221A-T [UK] 6910014690 S.BEA...
  • Page 7 August 2012 The combination of top side and bottom side of this SECTION 7. BOARD LAYOUTS • RF UNIT (For [USA], [EXP], [AUS]) (TOP VIEW) S250 • MAIN UNIT MP22 (TOP VIEW) MP26 MP22 MP20 R120 C122 C131 R115 C119 R110 C120 R111...
  • Page 8 August 2012 The combination of top side and bottom side of this • RF UNIT (For [USA], [EXP], [AUS]) • MAIN UNIT (BOTTOM VIEW) (BOTTOM VIEW) C507 B7591C C465 C467 D354 MP24 DS246 C132 S251 C380 C391 R382 C390 R544 DS247 R397 R223...
  • Page 9 August 2012 SECTION 10. VOLTAGE DIAGRAM • RF UNIT TX:2.83V TX:2.70V TX:4.75V RX:2.83V RX:2.75V RX:0.00V TX:0.79V RX:1.32V 2.7U 1.5P LDTC144EE 0.3P KTC3770U 2SC4215 RD07MUS2B 2SC4215 100P 6.8N 0.001 45.3N 0.001 0.001 27.2N 1SV307 HVD144A Fin1 Fin2 RD01MUS2 KTC3770U UNLK 4.7k L1SS400 Q392 LDTA144EE...
  • Page 10 August 2012 • MAIN UNIT (1/2) R251 CPU3V R500 1.75V TC7W53FK IC190 1 VIN1 VIN8 LMV324IPW 2 VOUT1 IC365 VOUT8 R559 6 CH1 3 VOUT2 1 V+ VOUT7 R557 7 CH0 C500 4 VIN2 2 IN VIN7 IC363 1.5k 8 VCC 5 VDD 3 LOCK 0.01...
  • Page 11 August 2012 • MAIN UNIT (2/2) R606 3.3M CPU3V C525 R621 BLM18RK102SN1 R361 CP10 1.12V 100k EP12 C526 R601 C623 CP10S CP11 IC383 100k CP10S CP12 1 ADJ2 BOOT R600 IC384 2 MODE/DATA JTCK R637 R638 CP10S CP13 1 VIN 3 VIN JTDI VOUT...
  • Page 12 VHF MARINE TRANSCEIVER S-14904XZ-C1 Jun. 2012...
  • Page 13 8. READ the instructions of the test equipment throughly before connecting it 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 14 TABLE OF CONTENTS SECTION SPECIFICATIONS SECTION INSIDE VIEWS SECTION DISASSEMBLY INSTRUCTION SECTION CIRCUIT DESCRIPITON RECEIVER CIRCUITS............4-1 TRANSMITTER CIRCUITS .

  • Page 15: Specifications

    SECTION 1. SPECIFICATIONS [CHN], [EUR], [UK], [USA], [EXP] [AUS] [FRG], [HOL] • Frequency coverage 156.025–157.425 MHz 156.000–161.450 MHz 156.050–163.275 MHz 156.300–162.025 MHz 156.000–163.425 MHz • Mode FM (16K0G3E), DSC (16K0G2B) • Operating temperature range –20°C to +60°C –10°C to +55°C –15°C to +55°C (–4°F to +140°F) 7.4 V DC nominal (negative ground)

  • Page 16: Inside Views

    SECTION 2. INSIDE VIEWS • MAIN UNIT (IC360) DATA LINE EEPROM LEVEL CONVERTER (IC340) (IC372) BACKLIT LED DRIVER (Q382) BACKLIT LED DRIVER (Q240) RESET IC (IC341) +3.3 V REGULATOR (IC220) AF MUTE SW TX MUTE SW (Q400) (IC366) SPEAKER SW (Q371) AF POWER AMP AF LPF...
  • Page 17 BUFFER • RF UNIT (Q50) (TOP VIEW) PRE-DRIVER AMP (Q53) POWER AMP (Q54) 1ST IF MIXER (Q150) 2nd IF FILTER TX POWER DETECTOR (FI151) (D91) 1st IF FILTER RF AMP (FI150) (Q90) DISCRIMINATOR (X170) • RF UNIT (BOTTOM VIEW) BUFFER (Q3) +3.3 V REGULATOR (IC2)
  • Page 18 MAIN UNIT MAIN UNIT MAIN UNIT SECTION 3. DISASSEMBLY INSTRUCTION 1. REMOVING THE MAIN UNIT 4) Remove the LCD holder from the MAIN UNIT. 1) Remove 6 screws from the rear panel. LCD holder Screws MAIN UNIT Reflector Screws MAIN UNIT 5) Remove the refl...
  • Page 19 8) Disconnect flat cables from J271, J280 and J290, panel. and then remove the MAIN UNIT from the rear pan- Antenna nut Remove with; “ICOM Driver (K)” BE CAREFUL about the fl atl cables when separating the (8960000110) MAIN UNIT from the chassis. MAIN UNIT...

  • Page 20: Receive Circuits

    SECTION 4. CIRCUIT DESCRIPTION 2ND IF CIRCUIT (RF UNIT) 4-1 RECEIVE CIRCUITS The 1st IF signal from the 1st IF circuits is applied to the IF IC RF CIRCUIT (RF UNIT) (IC170, pin 16). The IF IC contains the 2nd IF mixer, 2nd IF The RX signal from the antenna is passed through a two- AMP, detector, and so on, in its package.
  • Page 21 4-2 TRANSMIT CIRCUITS TX AF CIRCUIT (MAIN UNIT) TX AMP CIRCUIT (MAIN UNIT) The AF signal from the internal microphone (MC250) is The TX signal is sequentially amplifi ed by the buffer (Q50), passed through the MIC mute SW (IC260A, pins 1, 2), and YGR (Q53) and power (Q54) AMPs, and then passed then applied to the MIC AMP (IC200B, pin 6).

  • Page 22: Frequency Synthesizer Circuits

    4-3 FREQUENCY SYNTHESIZER (MAIN UNIT) • VCO • PLL The VCO (Q21, Q22, and D20–D22) generates both the 1st A portion of the VCO output signal is passed through two buf- LO signal and the TX signal. The generated signal is ampli- fers (Q23 and Q25), and then fed back to the PLL IC (IC1, pin fi...

  • Page 23: Port Allocations

    4-5 PORT ALLOCATIONS • CPU (MAIN UNIT: IC360) LINE LINE DESCRIPTION DESCRIPTION NAME NAME RX AF line switching control. [Y] key input. SPON H= AF signal is output from the inter- L=Pushed. nal speaker. [Z] key input. Transmit output power control. L=Pushed.
  • Page 24 • D/A CONVERTER (MAIN UNIT: IC190) LINE DESCRIPTION NAME AF output level adjustment. (RX signal) FCON Reference frequency adjustment. Noise squelch level adjustment. MSENS MIC sensitivity adjustment. • While receiving: Tuned BPF tuning. T1CON • While transmitting: TX output power adjustment. 4 - 5...

  • Page 25: Parts List

    SECTION 5. PARTS LIST [MAIN UNIT] [MAIN UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION IC200 1110006470 S.IC LMV324IPWR 37.4/11.5 R343 7030005050 S.RES ERJ2GEJ 103 X (10K) 65.6/35.6 IC220 1180003480 S.REG NJU7772F33-TE1-#ZZZB 62.8/32.0 R351 7030005120 S.RES ERJ2GEJ 102 X (1K) 93.2/6.2 IC260 1130011770 S.IC CD4066BPWR...

  • Page 26: Main Unit

    [MAIN UNIT] [MAIN UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION C191 4030016790 S.CER C1005 JB 1E 103K-T 7.8/18.0 C608 4030016930 S.CER C1005 JB 1A 104K-T 102.9/20.8 C192 4030019560 S.CER GRM21BB31C106KE15L 39.0/20.0 C609 4030016930 S.CER C1005 JB 1A 104K-T 103.0/26.6 C193 4030016790 S.CER C1005 JB 1E 103K-T 43.5/21.0 C610...
  • Page 27 [RF UNIT] [RF UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION 1130016080 S.IC GP214D <SEI> 11.5/33.3 7030005240 S.RES ERJ2GEJ 473 X (47K) 6.7/35.2 1180003480 S.REG NJU7772F33-TE1-#ZZZB 16.4/34.1 7030005050 S.RES ERJ2GEJ 103 X (10K) 7.9/32.2 IC50 1120002830 S.IC NJM2125F-TE1-#FZZB 36.1/20.2 7030005120 S.RES ERJ2GEJ 102 X (1K) 12.0/39.6 IC170 1110007320 S.IC...
  • Page 28 [RF UNIT] [RF UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION R381 7030005050 S.RES ERJ2GEJ 103 X (10K) 34.8/24.5 4030017400 S.CER C1005 CH 1H 220J-T [CHN] T 38.9/39.0 R382 7030005290 S.RES ERJ2GEJ 682 X (6.8K) 36.6/25.3 4030017400 S.CER C1005 CH 1H 220J-T [EUR] R383 7030008010 S.RES ERJ2GEJ 123 X (12K)
  • Page 29 [RF UNIT] [MIC UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION 6910014690 S.BEA MPZ1608S221A-T 41.6/45.0 J291 6510021941 CON 246S-550-4P-68(JIS8) 6910014690 S.BEA MPZ1608S221A-T 37.7/33.5 6910018460 S.BEA MMZ1005Y102C-T 41.7/12.5 6910018460 S.BEA MMZ1005Y102C-T 41.5/37.9 8900017010 CAB OPC-1744 (P0.5N6L66) <TJM> 6910014690 S.BEA MPZ1608S221A-T [CHN] B 5.8/26.1 6910014690 S.BEA MPZ1608S221A-T...

  • Page 30: Board Layouts

    SECTION 6. MECHANICAL PARTS [CHASSIS PARTS] [RF UNIT] ORDER ORDER DESCRIPTION QTY. DESCRIPTION QTY. J280* 6510026130 IMSA-9681S-36Y900 6910014190 2497 ANT CONNECTOR <EIK> S250 2260000980 SKHHLP014A 2510001660 036D0804 S251* 2230001110 SKRPACE010 8900014801 OPC-1573-1 (P0.5N10L50) 8900016840 OPC-1753 (P0.5N36L70) 6910022640 PGS4ER-CX-412 MP20* 8510016471 2775 VCO CASE-1 MP21 8510016461 2775 VCO COVER-1 8210028000 3394 FRONT PANEL ASSEMBLY...
  • Page 31 MP16(C) MP24(C)×4 MP68(C) MP15(C) MP6(C) MP75(C) MP7(C) MP78(C) MP67(C) MP25(C)×4 J291(MI) MP66(C)×2 MP79(C) MIC UNIT EP1(C) MP23(C)×2 W1(MI) W1(C) MP48(C) MP14(C) MP39(C)×3 MP80(C) J31(C) MP34(C)×2 MP21(R) MP362(R) MP21(C) MP31(C) MP9(C) MP8(C) MP73(C) RF UNIT MP72(C) MP42(C) MP59(C)×2 MP60(C) W1(R) MP360(M) MP33(C)×2 DS246(M) MP363(M)
  • Page 32 The combination of top side and bottom side of this SECTION 7. BOARD LAYOUTS • MAIN UNIT (TOP VIEW) • RF UNIT (TOP VIEW) S250 MP22 MP26 MP22 MP20 R120 C122 C131 R115 C119 R110 C120 R111 C121 D131 C115 C110 R380 UNLK...
  • Page 33 The combination of top side and bottom side of this • MAIN UNIT (BOTTOM VIEW) • RF UNIT (BOTTOM VIEW) C507 B7591C C465 C467 D354 MP24 DS246 C132 S251 C380 C391 R382 C390 R544 DS247 R397 R223 Q390 Q151 C224 R225 C157 R156...
  • Page 34 SECTION 8. GENERAL WIRING EP1: PGS4ER-CX-412 MIC UNIT GPS MODULE 8900014801 8900017010 OPC-1744 OPC-1573-1 (P0.5N6L66) (P0.5N10L50) J271 J290 MAIN UNIT 8900016840 RF UNIT OPC-1753 J280 J280 (P0.5N36L70) 8 - 1...
  • Page 35 SECTION 9. BLOCK DIAGRAM CHASSIS Q21,Q22:KTC3770U Q391: Q23: 2SC4215 IC1:GP214D Q24: D50,D51: Q50: Q53: Q54: DET PIN Q390:2SJ347 LMNU5213DW1 D52:1SV307 D22:HVC350BYPTL 2SC4215 HVD144A KTC3770U RD01MUS2 RD07MUS2B PLL IC 3.3V LOOP TX/RX BUFF BUFF BUFF DRIVE IC2:NJU7772F33 Q20:LDTC144EE CR-921 D20:HSC277TRF Q3:2SK880 WETIN D21:HSC277TRF 21.25MHz...

  • Page 36: Voltage Diagram

    SECTION 10. VOLTAGE DIAGRAM • RF UNIT TX:2.83V TX:2.70V TX:4.75V RX:2.83V RX:2.75V RX:0.00V TX:0.79V RX:1.32V 2.7U 1.5P LDTC144EE 0.3P KTC3770U 2SC4215 RD07MUS2B 100P 2SC4215 6.8N 0.001 45.3N 0.001 0.001 27.2N 1SV307 HVD144A Fin1 Fin2 RD01MUS2 UNLK KTC3770U L1SS400 4.7k Q392 SCKO LDTA144EE OSCI...
  • Page 37 • MAIN UNIT (1/2) R251 CPU3V R500 1.75V IC190 TC7W53FK 1 VIN1 VIN8 LMV324IPW 2 VOUT1 IC365 R559 VOUT8 6 CH1 3 VOUT2 1 V+ R557 VOUT7 7 CH0 C500 4 VIN2 2 IN VIN7 1.5k 8 VCC IC363 5 VDD 3 LOCK 100k 0.01...
  • Page 38 • MAIN UNIT (2/2) R606 3.3M CPU3V C525 R621 BLM18RK102SN1 R361 CP10 100k EP12 1.12V C526 C623 CP10S CP11 R601 IC383 CP10S CP12 100k 1 ADJ2 BOOT R600 IC384 2 MODE/DATA JTCK R637 R638 CP10S CP13 1 VIN 3 VIN JTDI 100k VOUT...
  • Page 39 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, The Boulevard, Altira Business Park, Herne Bay, CT6 6GZ, UK Phone : +44 (01227) 741741...
  • Page 40 S-14904XZ-C1 1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan © 2012 Icom Inc.

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