Icom IC-M25, Service Manual

Page 1: ...S 15208XZ C1 August 2015 VHF MARINE TRANSCEIVER iM25 iM25EURO ...

Page 2: ...owly and smoothly 4 DO NOT short any circuits or electronic parts An insulated tuning tool MUST be used for all adjustments 5 DO NOT keep power ON for a long time when the trans ceiver is defective 6 DO NOT transmit power into a Standard Signal Generator or a Sweep Generator otherwise the RF power may dam age them 7 ALWAYS connect a 30 dB to 40 dB attenuator between the transceiver and a Deviation...

Page 3: ...IVER CIRCUITS 5 1 5 2 TRANSMITTER CIRCUITS 5 2 5 3 FREQUENCY SYNTHESIZER CIRCUITS 5 3 5 4 VOLTAGE BLOCK DIAGRAM 5 3 SECTION 6 ADJUSTMENT PROCEDURES 6 1 PREPARATION 6 1 6 2 FREQUENCY ADJUSTMENT 6 2 6 3 RECEIVE ADJUSTMENT 6 3 6 4 TRANSMIT ADJUSTMENT 6 3 SECTION 7 PARTS LIST SECTION 8 MECHANICAL PARTS SECTION 9 BOARD LAYOUTS SECTION 10 BLOCK DIAGRAM SECTION 11 VOLTAGE DIAGRAM ...

Page 4: ... 5 W approximately 1 W Modulation system Variable reactance frequency modulation Maximum frequency deviation 5 kHz Adjacent channel power 70 dB Spurious emissions 68 dBc typical Residual modulation 40 dB Audio frequency response 1 dB to 3 dB of 6 dB octave from 300 3000 Hz IC M25EURO IC M25 only CHN D D Output power 5 W approximately 1 W 0 5 W For only FRG Modulation system Variable reactance freq...

Page 5: ...2 1 SECTION 2 INSIDE VIEWS MAIN UNIT TOP VIEW LOCK VOLTAGE BUFFER IC400 AF SW IC260 LITHIUM BATTERY CHARGER IC601 ...

Page 6: ... IC362 CPU CLOCK X360 EEPROM IC340 DUAL OP AMP IC365 1st IF FILTER FI151 PLL IC IC1 REFERENCE FREQUENCY OSCILLATOR X1 DISCRIMINATOR X170 2nd IF FILETR FI170 IF IC IC170 DRIVE AMP Q53 RESET IC341 3 V REGULATOR IC220 QUAD OP AMP IC200 TX POWER AMP Q54 1st IF FILTER FI150 TX POWER AMP Q55 ...

Page 7: ...トケーブル 起こす フラッ トケーブル クランプ ケーブル フラッ ト ケーブル フラッ ト ケーブル UNSOLDER Solder remover Sensor connector Rear panel 6 screws Front panel MAIN UNIT MAIN UNIT 3 screws CHASSIS SPEAKER CABLE FFC フラッ ト ケーブル フラッ ト ケーブル 起こす フラッ トケーブル UNSOLDER Solder remover Sensor connector Rear panel 6 screws Front panel MAIN UNIT MAIN UNIT 3 screws CHASSIS SPEAKER CABLE FFC ケーブル フラッ ト ケーブル フラッ トケーブル UNSOLDER Solder remover Sensor...

Page 8: ...y dry the transceiver if it is wet Dispose the old battery pack according to the laws in your area 2 Carefully separate the rear panel and turn it over in order to disconnect the battery connector and the red sensor connector 3 Pull the old battery pack off the rear panel If the double sided tape is adherent to the rear panel re move it 2 Separate the double sided tapes which are sup plied with th...

Page 9: ...ied by the noise amplifier and then rectified by the internal noise detector to be converted into DC voltage which represents the noise level The 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 IC360 compares the applied voltage and squelch reference level to control the audio signal ON OFF emits mutes RX AF CIRCUITS The demodulated AF si...

Page 10: ...mbined at the power combiner L107 L108 R465 C457 and C458 to obtain the TX output power The amplified TX signal is passed through the ANT SW D52 and LPF L81 L82 C83 C86 and C89 and then applied to the antenna APC CIRCUIT A portion of TX output signal is rectified by D91 to produce the DC voltage which represents the TX power level The APC AMP IC50 compares the voltage and TX power setting voltage ...

Page 11: ... is a PLL IC which contains the pre scaler programmable counter phase comparator and charge pump in its package The 21 25 MHz reference frequency signal is fed from X1 The loop filter is composed by R10 R22 C11 C13 and C24 5 4 VOLTAGE BLOCK DIAGRAM LO SW BUFF BUFF BUFF FIL LOOP X1 21 25 MHz 1st mixer D 50 D51 Q24 Q23 Q25 Q 21 Q22 IC1 PLL IC IF IC CPU VCO Q150 TX AMPs I C170 IC360 PLLO 2ND LO D22 D...

Page 12: ... Standard signal generator SSG Frequency range 0 1 300 MHz Output level 20 dBµ to 90 dBµ 127 to 17 dBm M REQUIRED EQUIPMENTS 6 1 PREPARATION OPC 478 U UC WHITE MIC MIC line SP line BLUE CLONE SHIELD GND CLONE line OPC 1668 To the transceiver RED AFOUT To audio generator AC millivoltmeter To SINAD meter speaker 33 kΩ PTT GENERAL CONNECTION to the antenna connector RF power meter 0 1 6 W 50 Ω Freque...

Page 13: ...e I O Check screen as below LVIN On the I O Check screen 1 65 V 0 5 V 2 CH 16 Transmitting 1 70 V 0 5 V REFERENCE FREQUENCY 1 CH 16 Transmitting Loosely couple a frequency counter to the antenna connector Ref Freq 156 800000 MHz 500 Hz 6 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 and th...

Page 14: ...e re adjusted too CH 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 connecto...

Page 15: ... R10JFB 0 B 70 6 20 2 L51 6200011021 S COI ELJRF 82NJFB 0 B 71 2 16 6 L53 6200006981 S COI ELJRE R10GFA 0 B 70 5 10 0 L55 6200012680 S COI 0 30 1 3 5TL 20N COMO B 84 5 11 8 L56 6200012390 S COI 0 30 0 92 3TR 5 8N COMO B 87 1 10 5 L57 6200012680 S COI 0 30 1 3 5TL 20N COMO B 89 6 9 6 L58 6200003711 S COI NLV25T 2R7J PF B 102 3 9 7 L80 6200012470 S COI 0 30 1 7 7TL 45 3N COMO B 99 0 8 3 L81 62000127...

Page 16: ...5080 S RES ERJ2GEJ 823 X 82K B 37 0 33 6 R435 7030008010 S RES ERJ2GEJ 123 X 12K B 35 4 33 6 R450 7030007280 S RES ERJ2GEJ 331 X 330 B 43 5 45 2 R451 7030005040 S RES ERJ2GEJ 472 X 4 7K B 46 8 47 7 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 43 9 46 4 R457 70300...

Page 17: ...3K T T 31 6 8 9 C159 4030016790 S CER C1005 JB 1E 103K T T 24 8 7 7 C160 4030018240 S CER C1005 JB 1H 562K T T 26 5 10 9 C170 4030017460 S CER C1005 JB 1H 102K T B 24 4 11 2 C171 4030017420 S CER C1005 CH 1H 470J T B 22 0 10 1 C174 4030017460 S CER C1005 JB 1H 102K T B 19 8 12 4 C176 4030017460 S CER C1005 JB 1H 102K T B 22 2 12 3 C179 4030017450 S CER C1005 JB 1H 271K T B 15 8 12 4 C180 403001745...

Page 18: ... B 11 7 20 7 C411 4030017420 S CER C1005 CH 1H 470J T B 11 6 11 9 J250 6450002460 CON HSJ1594 010160 J607 6510025142 S CON 10FLT SM2 TB LF SN M B 11 2 8 1 J608 6510009351 CON B2B ZR LF SN S250 2260001900 SWI SW 149 SKHLLDA010 W1 8900014801 CAB OPC 1573 1 P0 5N10L50 TJM EP4 6910018460 S BEA MMZ1005Y102C T B 14 5 11 4 EP5 6910024660 S BEA MPZ2012S102AT B 11 7 14 1 EP6 6910018460 S BEA MMZ1005Y102C T...

Page 19: ...ING Y1355 HOL 1 8930092380 3723 EARTH SPRING Y1355 EUR 01 1 8930092380 3723 EARTH SPRING Y1355 UK 01 1 8930092380 3723 EARTH SPRING Y1355 FRG 01 1 8930092380 3723 EARTH SPRING Y1355 HOL 01 1 8930092380 3723 EARTH SPRING Y1355 EUR 02 1 8930092380 3723 EARTH SPRING Y1355 UK 02 1 8930092380 3723 EARTH SPRING Y1355 FRG 02 1 8930092380 3723 EARTH SPRING Y1355 HOL 02 1 ACCESSORIES MAIN UNIT REF ORDER DE...

Page 20: ...92080 MP50 CHASSIS 8930071260 MP17 CHASSIS 8930092070 MP15 CHASSIS 8830003440 MP59 CHASSIS 8930092640 MP6 CHASSIS 8930092120 MP11 CHASSIS 8930092150 MP5 CHASSIS 8930092050 MP2 CHASSIS 8310086980 MP19 CHASSIS 8930092310 MP4 CHASSIS 8930068980 MP18 CHASSIS 8930078010 MP13 CHASSIS 8930092230 MP1 CHASSIS Refer to the list SP1 CHASSIS 2510001980 MP46 CHASSIS 8930090100 MP3 CHASSIS 8930092680 W1 CHASSIS...

Page 21: ...7 C612 C613 CP360 D91 D200 1 4 2 S D 0 4 2 S D DS242 DS243 DS244 DS245 IC50 IC260 IC360 IC400 IC601 L1 MC250 Q151 Q240 Q351 Q357 Q365 Q603 R47 R65 R66 R67 R68 R81 R153 R154 R155 R156 R206 R212 R213 R214 R240 R260 R261 R262 R263 R265 R300 R361 R371 R372 R373 R374 R376 R381 R382 R383 R384 R386 R388 R396 R401 R410 R411 R468 R477 R607 R608 R609 R634 R641 R642 S1 S2 S3 S4 S5 S6 S7 S8 H0 H5 H10 H15 H20 ...

Page 22: ...70 IC190 IC200 IC220 IC340 IC341 IC362 IC364 IC365 J251 J252 J601 J603 J604 L20 L21 L22 L23 L24 L25 L26 L50 L51 L53 L55 L56 L57 L58 L80 L81 L82 L90 L92 L93 L96 L97 L98 L99 L100 L101 L102 L103 L104 L105 L106 L107 L108 MP20 MP20 Q20 Q21 Q22 Q23 5 2 Q 4 2 Q Q50 Q53 Q54 Q55 Q90 Q150 Q221 Q222 Q224 Q225 Q230 Q231 Q250 Q251 Q350 Q353 Q354 Q362 Q366 Q606 Q608 Q609 R1 R2 R3 R4 R5 R6 R7 R10 R20 R22 R23 R24...

Page 23: ...TF X360 CR 911 UPD78F0338GC SP LDTA114YE Q224 KTC811U Q225 2SB1132L NJU7704F3 03A S 1335J30 M5T1U3 NJU7057RB1 MIC TPA0211DGN Q231 KTC811U D350 KDS122 JTBM450CX70 LTM450FW NJM2591V R2A20178 2SC4215 FI151 FL 399A 3SK293 3SK294 D93 RB706F LDTA144EE D90 KDS114E RD07MUS2B RD01MUS2B KTC3770U RN142G 2SC4215 2SC4215 2SC4215 D20 KDS114E D21 KDS114E D22 D23 BBY58 CR 766 COMMON LINE RX LINE TX LINE D130 BB17...

Page 24: ... WP 8 VCC R213 150k 100 R659 SML S13UT DS252 1 C436 220 C287 0 1 C255 0 22 C256 1 C400 10k R413 100 R404 R272 100k 12k R293 R286 12k TJ3901TF DS246 1 SEG0 2 SEG1 3 SEG2 4 SEG3 5 COM0 6 COM1 7 COM2 8 COM3 9 SEG4 10 SEG5 11 SEG6 12 SEG7 13 SEG8 14 SEG9 15 SEG10 16 SEG11 17 SEG12 18 SEG13 19 SEG14 20 SEG15 21 SEG16 22 SEG17 23 SEG18 24 SEG19 25 SEG20 0 0082 C264 22P C371 MC250 EM6027P 1 C612 0 R396 U...

Page 25: ...LDTC144EE LDTA144EE Q351 LDTC144EE Q354 LDTC144EE Q357 5P C94 270P C179 270P C180 L50 0 1U 82N L51 R26 6 8k EZJZ0V80010 D357 0 1 C462 0 1 C463 R235 330k R236 150k LDTC144EE Q603 10k R647 L1SS400 D609 RSQ035P03TR Q353 1 2 3 4 5 6 RSQ035P03TR Q606 1 2 3 4 5 6 L1SS400 D3 LDAN222 D358 56P C448 LRB551V D610 R2 100k 1M R650 10k R477 R36 120 R6 47k R7 470 R23 220 R80 82k R70 150k R28 100 R57 68 R228 180k...

Page 26: ... 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 39C Rennie Drive Airport Oaks Auckland New Zealand Phone 64 09 274 4062 Fax 64 09 274 4708 URL http www icom co nz E mail inquiries icom co nz Rua Itororó 444 Padre Eustáquio Belo Horizonte MG CEP 30720 450 Brazil Phone 55 31 ...

Page 27: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan S 15208XZ C1 2015 Icom Inc ...