Icom IC-M23, Service Manual

Page 1: ...S 14720XZ C1 Apr 2011 VHF MARINE TRANSCEIVER ...

Page 2: ...ORDER EXAMPLE 1110003491 S IC TA31136FNG IC M23 MAIN UNIT 5 pieces 8820001210 Screw 2438 screw IC M24 Top cover 10 pieces Addresses are provided on the inside back cover for your convenience ORDERING PARTS 1 Make sure that the problem is internal before dis assembling the transceiver 2 DO NOT open the transceiver until the transceiver is disconnected from its power source 3 DO NOT force any of the...

Page 3: ...TTER CIRCUITS 4 2 4 3 FREQUENCY SYNTHESIZER CIRCUITS 4 3 4 4 VOLTAGE DIAGRAMS 4 3 4 5 PORT ALLOCATIONS 4 4 SECTION 5 ADJUSTMENT PROCEDURES 5 1 PREPARATION 5 1 5 2 FREQUENCY ADJUSTMENTS 5 2 5 3 RECEIVE ADJUSTMENTS 5 3 5 3 TRANSMIT ADJUSTMENTS 5 3 SECTION 6 PARTS LIST SECTION 7 MECHANICAL PARTS SECTION 8 BOARD LAYOUTS SECTION 9 BLOCK DIAGRAM SECTION 10 VOLTAGE DIAGRAM ...

Page 4: ...distortion All stated specifications are subject to change without notice or obligation M IC M23 D GENERAL Frequency coverage Transmitting 156 000 161 450 MHz Receiving 156 000 163 425 MHz Mode FM 16K0G3E Antenna impedance 50 Ω nominal Power supply requirement BP 266 only 3 7 V DC nominal negative ground Current drain approximately TX 5 W 1 0 W 0 5 W 2 3 A 0 9 A 0 7 A Maximum audio 0 35 A typical ...

Page 5: ...2 1 SECTION 2 INSIDE VIEWS MAIN UNIT TOP VIEW M3V LINE SW Q225 CHARGING CONTROLLER IC601 SPEAKER JACK J251 ...

Page 6: ...MP IC365 D A CONVERTER IC190 TX POWER AMP Q54 TX POWER AMP Q55 REFERENCE FREQUENCY OSCILLATOR X1 PLL IC IC1 EEPROM IC340 CPU CLOCK X360 DISCRIMINATOR X170 2ND IF FILTER FI170 1ST IF FILTER FI151 1ST IF FILTER FI150 CHARGING CONTROL SW Q602 5 V REGULATOR IC602 WET SENSING JACK J602 CPU IC360 3 V REGULATOR IC220 FLASHING LED DS247 ...

Page 7: ...LY lift the rear panel up and unplug the wet sensor wire 2 Remove 4 screws from the PCB and then remove the CHASSIS 5 Remove 6 screws from the PCB DC cap Antenna nut 6 screws Rear panel J602 J602 Wet sensor wire 6 screws J251 Front panel PCB SP cable UNSOLDER Solder remover Chassis 4 screws Chassis PCB 6 CAREFULLY lift the PCB out of the front panel and then turn it over in order to unplug the spe...

Page 8: ...hen applied to the noise amplifer IC170 R174 R176 C179 C180 Only noise components approximately 30 kHz signal are amplified by the noise amplifier and then rectified by the internal noise detector to be converted into DC voltage corresponding to noise level the squelch voltage The squelch voltage is output from the pin 14 of IC170 and then applied to the A D port of the CPU IC360 pin 33 The CPU IC...

Page 9: ... R463 C445 C446 and applied to the power AMPs Q54 and Q55 The amplified signals are combined at the power combiner L107 L108 R465 C457 C458 to obtain the TX output power The amplified TX signal is passed through the ANT SW D52 and LPF and then applied to the antenna APC CIRCUIT A portion of TX output signal is rectified by D91 to produce the DC voltage which corresponds to the TX power level The A...

Page 10: ... then applied to the 1st mixer Q150 through the LO SW D51 PLL IC1 is a PLL IC which contains the prescaler programmable counter phase comparator and charge pump in its package The 21 25 MHz reference frequency signal is fed from X1 The loop filter for the VCO is composed by R8 R10 R22 C11 C13 and C24 4 4 VOLTAGE BLOCK DIAGRAM LO SW BPF BUFF BUFF BUFF FIL LOOP X1 21 25MHz 1st mixer D 50 D51 Q24 Q23...

Page 11: ...uelch is opened O 86 V3VS VCO power supply control O 87 M3VS Main power supply control O 88 LOW TX power control H The TX power is set to Low O 89 R3VS R3V line control L While receiving RX circuits activated O 90 T3VS T3V line control L While transmitting TX circuits activated O 97 PON Main power supply line control O 98 DETMS RX AF line mute L Mute O 99 LEDI R Charge status L While charging Puls...

Page 12: ...requency counter Frequency range 0 1 300 MHz Frequency accuracy 1 ppm or better Input level Less than 1 mW Standard signal generator SSG Frequency range 0 1 300 MHz Output level 20 dBµ to 90 dBµ 127 to 17 dBm REQUIRED EQUIPMENTS 5 1 PREPARATION to the antenna connector RF power meter 0 1 6 W 50 Ω Frequency counter Standard signal generator 20 to 90 dBµ 127 dBm to 17 dBm DO NOT transmit while an SS...

Page 13: ...I O Check screen as below LVIN On the I O Check screen 1 95 2 95 V 2 CH 16 Transmitting 1 50 2 50 V REFERENCE FREQUENCY 1 CH 16 Transmitting Loosely couple a frequency counter to the antenna connector Ref Freq 156 800000 MHz 500 Hz 5 2 FREQUENCY ADJUSTMENTS 1 Select an adjustment item using on the PC s keyboard 2 Set or modify the adjustment value as specified using on the PC s keyboard then push ...

Page 14: ... 16 Receiving Connect an SSG to the antenna connector and set it as Frequency 156 800 MHz Level 30 dBµ 77 dBm Modulation 1 kHz Deviation 3 0 kHz BPF Push ENTER on BPF Automatic adjustment SQUELCH 1 NOTE When RX SENSITIVITY must be adjusted before SQUELCH And when RX SENSITIVITY is re adjusted SQUELCH must be re adjusted too CH 16 Receiving Connect an SSG to the antenna connector and set it as Freq...

Page 15: ...C6342A 88NG A B 57 0 9 7 L23 6200011031 S COI ELJRF R10JFB B 60 3 19 6 L24 6200011031 S COI ELJRF R10JFB B 62 9 19 8 L25 6200011031 S COI ELJRF R10JFB B 54 3 20 4 L26 6200007001 S COI ELJRE 82NGFA B 83 7 24 5 L50 6200011031 S COI ELJRF R10JFB B 73 8 20 3 L51 6200011021 S COI ELJRF 82NJFB B 74 3 16 7 L53 6200006981 S COI ELJRE R10GFA B 71 4 9 2 L55 6200012680 S COI 0 30 1 3 5TL 20N COMO B 87 6 9 6 ...

Page 16: ... RES ERJ2GEJ 123 X 12K B 54 5 27 4 R450 7030007280 S RES ERJ2GEJ 331 X 330 B 69 2 26 6 R451 7030005040 S RES ERJ2GEJ 472 X 4 7K B 71 0 29 2 M Mounted side T Mounted on the Top side B Mounted on the Bottom side S Surface mount REF PARTS DESCRIPTION M H V NO NO LOCATION MAIN UNIT R452 7030007290 S RES ERJ2GEJ 222 X 2 2K B 69 2 27 5 R457 7030005050 S RES ERJ2GEJ 103 X 10K B 50 6 29 4 R458 7030005040 ...

Page 17: ...3K T B 10 9 19 6 C365 4030016950 S CER C1005 JB 1A 473K T B 12 1 19 0 C366 4030016950 S CER C1005 JB 1A 473K T B 13 8 15 8 C367 4030017460 S CER C1005 JB 1H 102K T USA B 9 4 21 1 4030017460 S CER C1005 JB 1H 102K T EXP 4030017460 S CER C1005 JB 1H 102K T AUS M Mounted side T Mounted on the Top side B Mounted on the Bottom side S Surface mount REF PARTS DESCRIPTION M H V NO NO LOCATION MAIN UNIT C3...

Page 18: ...D TAK 35920 FX3340 ITAK DS247 5040003560 LED RT3 234HRH16T BNS ROD DS248 5040003001 S LED SML A12UT T86J T 2 9 25 3 MC250 7700002710 MIC EM6027P 46C33 G HOR S250 2260001900 SWI SW 149 SKHLLD EP2 6910014690 S BEA MPZ1608S221A T B 71 4 7 9 EP3 6910014690 S BEA MPZ1608S221A T B 88 1 12 7 EP8 6910021240 S BEA MMZ1005A152ET B 61 1 17 0 EP10 6910014690 S BEA MPZ1608S221A T B 83 0 22 2 EP11 6910018460 S ...

Page 19: ...30920 1301 SHEET 1 MP50 8930082490 O RING CH TOP 1 MP51 8930082680 3340 DETECTION PIN 2 MP52 8930082630 INSULATION SHEET MU 1 MP53 8930083180 SPONGE LG 1 MP54 8930083370 3340 FERRITE SHEET CHN 2 8930083370 3340 FERRITE SHEET EUR 1 2 8930083370 3340 FERRITE SHEET EUR 2 8930083370 3340 FERRITE SHEET UK 2 8930083370 3340 FERRITE SHEET FRG 2 8930083370 3340 FERRITE SHEET HOL 2 ACCESSORIES MAIN UNIT RE...

Page 20: ... CH x6 MP25 CH x6 W2 CH To J602 M MP6 CH MP50 CH MP17 CH MP15 CH MP14 CH J31 CH MP1 CH EP360 M MP5 CH MP362 M MP33 CH x5 MP39 CH MP53 CH W1 CH SP1 CH MP32 CH MP42 CH MP34 CH MP12 CH MP13 CH x2 MP363 M MAIN UNIT Abbreviations CH CHASSIS PARTS M MAIN UNIT MP31 CH MP35 CH MP10 CH MP11 CH MP52 CH To J251 M ...

Page 21: ...D610 1 4 2 S D 0 4 2 S D 3 4 2 S D 2 4 2 S D DS244 DS245 DS248 EP11 IC50 IC260 IC601 J251 MP22 Q151 Q221 Q222 Q224 Q225 Q351 Q353 Q354 Q357 Q363 Q364 Q365 Q366 Q603 Q606 R36 R65 R66 R67 R68 R69 R70 R73 R74 R81 R153 R154 R155 R156 R192 R194 R222 R223 R224 R225 R226 R227 R228 R235 R236 R264 R381 R382 R383 R384 R386 R397 R398 R401 R466 R467 R469 R471 R475 R476 R477 R602 R607 R608 R609 R610 R611 R628 ...

Page 22: ...3 D130 D131 D350 D353 D355 D356 D603 D604 D612 EP2 EP3 EP8 EP10 FI150 FI170 IC1 IC170 IC190 IC200 IC220 IC340 IC341 IC360 IC362 IC365 IC602 J602 J602 L1 L20 L21 L22 L23 L24 L25 L26 L50 L51 L53 L55 L56 L57 0 8 L 8 5 L L81 L82 L90 L92 L93 L96 L97 L98 L99 L100 L101 L102 L103 L104 L105 L106 L107 L108 MP20 Q3 Q20 Q21 Q22 Q23 Q24 Q25 Q50 Q53 Q54 Q55 Q90 Q150 Q230 Q231 Q240 Q250 Q350 Q362 Q602 Q608 Q609 ...

Page 23: ...20 X360 CR 911 UPD78F0338GC SP L2SA1576AS Q224 KTC811U Q225 KTA1664 NJU7704F03A NJU7772F03 LMV358IPW MIC TPA0211DGN Q231 KTC811U D350 KDS122 JTBM450CX70 LTM450FW NJM2591V M62364FP KTC3880S FI151 FL 399A 3SK293 3SK294 D93 RB706F LDTA144E E D90 HVD144A RD07MUS2B RD01MUS2 KTC3770U HVD144A 2SC4215 2SC4215 2SC4215 D 20 MA2S077G0 D 21 MA2S077G0 D22 HVB350BYPTL CR 766 D130 KDV214E T1CON LM324IPW LM324IPW...

Page 24: ...2 C612 0 047 R263 18K R452 2 2K R279 1 5K C202 0 1 D355 L1SS400 C402 0 1 R649 0 C613 0 047 R435 12K R264 EXB28V104J C264 0 0056 IC200 6 5 7 C361 0 047 R412 10K R201 2 2K C254 0 1 Q250 LDTC144EE R193 470 R205 8 2K C193 0 01 CP405 R391 47K R300 6 8K CP402 R430 270K S326 C340 0 01 S323 C379 47P R340 100K C257 0 01 DS242 LNJ426W83RA R353 1K R433 100K C400 0 1 Q230 RSQ035P03TR 1 2 3 4 5 6 C265 100P Q35...

Page 25: ...9 2P C222 0 01 R105 220K R76 100 R10 560 R109 10 R31 220 L108 0 30 1 7 7TL Q363 RSQ035P03TR 1 2 3 4 5 6 C8 2P C77 0 1 R1 NTCG16 C42 5P R4 47K R122 150K C466 10 R26 6 8K CP240 C110 33P L58 NLV25T EP2 MPZ1608S221A C608 0 047 C223 0 01 C606 0 1 C98 2P R170 390 C71 27P R71 100 C94 5P IC1 MB15E03SLPFV1 G BND E1 1 OSCI 2 OSCO 3 VP 4 VCC 5 DO 6 GND 7 XFIN 8 FIN 9 CLK 10 DAT 11 LE 12 PS 13 ZC 14 L F 15 P ...

Page 26: ...5 454 7619 Glenwood Centre 150 6165 Highway 17 Delta B C V4K 5B8 Canada Phone 1 604 952 4266 Fax 1 604 952 0090 URL http www icomcanada com E mail info icomcanada com Unit 1 103 Garden Road Clayton VIC 3168 Australia Phone 61 03 9549 7500 Fax 61 03 9549 7505 URL http www icom net au E mail sales icom net au 146A Harris Road East Tamaki Auckland New Zealand Phone 64 09 274 4062 Fax 64 09 274 4708 U...

Page 27: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan S 14720XZ C1 2011 Icom Inc ...