Icom IC-M25 Service Manual Download Page 25

Page: 25 / 27

11-2

• MAIN UNIT (2/2)

Refer to the PARTS LIST for the value and name of component.

0.001
C453

MPZ1608S221A

EP3

MPZ1608S221A

EP2

RB706F

D91

0.1

C58

0.1

C181

0.01

C56

0.001

C20

0.001

C12

0.001

C25

0.001

C28

0.001

C30

0.001

C31

0.001

C44

0.001

C35

0.001

C36

0.001

C38

0.001

C41

0.001

C50

0.001

C52

0.001

C53

0.001

C60

0.001

C62

0.001

C170

0.001

C174

0.001

C176

0.001

C229

0.001

C380

470P

C59

470P

C67

0.0056

C160

0.022

C157

0.01

C159

CR-766

10k

47k

R20

100

R24

100k

R25

100k

R30

68k

R33

39k

R50

R53

100

R55

3.3k

R56

1.2k

R65

150k

R68

100

R75

100

R154

100k

R156

470

R170

390

R173

1.5k

R172

470

R227

10k

R381

2.2k

R384

12k

R383

2.7k

R382

10k

R386

220P

C21

C22

1.5P

C32

1.5P

C34

220P

C33

12P

C39

15P

C40

C42

22P

C43

15P

C54

47P

C68

0.001

C73

0.001

C74

0.001

C80

18P

C81

18P

C82

22P

C83

11P

C84

24P

C85

C86

C89

C90

10P

C91

0.001

C154

0.001

C156

Q90

3SK294

3SK293

Q150

0.01

C102

47P

C103

0.022

C120

0.01

C104

0.001

C109

0.75P

C113

L92

56N

L93

56N

L96

56N

L97

R109

R91

220k

R93

10k

R94

220k

R96

270k

10k

R103

220k

R105

220k

R107

R120

2.2k

2.7U

L58

Q23

2SC4215

Q24
2SC4215

Q25
2SC4215

1SV307

D52

CP80

CP10S

CP1

CP10S

R175

27k

R176

0.001

C132

0.001

C133

22P

C95

C98

33P

C110

270k

R397

10k

R398

CP300

C11

R155

2.2k

27P

C99

0.1

C77

0.1

C78

47P

C69

R54

L57

20N

FI150
FL-368

FI151
FL-399A

R81

100k

R226

4.7k

Q21

KTC3770U

Q22

KTC3770U

L20

82N

L23

0.1U

L24

0.1U

L25

0.1U

L82

27.2N

L81

24N

L80

45.3N

L90

45.3N

L98

0.82U

Q50

KTC3770U

KTC811U

Q224

LTM450FW

FI170

0.01

C63

1.8k

R110

220

R97

C155

R52

2.2k

R73

10k

R74

56k

100k

R401

R66

68k

27P

C55

56N

L99

47N

L100

47N

L101

22N

L102

22N

L103

18P

C442

27P

C443

18P

C445

12P

C446

24P

C447

24P

C449

56P

C450

100

R463

R10

560

R22

4.7k

L55

20N

L104

L56

5.8N

L105

470P

C451

47P

C452

27P

C71

27P

C455

0.001

C456

10P

C457

15P

C458

20N

L106

45.3N

L107

45.3N

L108

MPZ1608S221A

EP10

100

R465

0.001

C72

R67

120k

10k

R466

56k

R467

100

R464

0.1

C461

LDTA144EE

Q365

C227

NJM2591V

IC170

OSCIN

OSCOUT

MIXOUT

V+

IFIN

DEC

FILOUT

FILIN

AFOUT

QUAD

IFOUT

RSSI

NOISEDET

NOISEREC

GND

MIXIN

47P

C171

C97

47P

C114

C116

47P

C119

R171

2.7k

R174

330k

R32

150

R31

220

R34

270

R27

8.2k

R35

39k

L21

4.7U

100

R76

X170

JTBM450CX70

LDTC144EE

Q362

220

R461

R462

0.001

C441

0.01

C122

0.1

C440

10k

R457

4.7k

R458

4.7k

R459

R113

11P

C131

L22

C6342A

2.5P

C112

Q20

LDTC144EE

LDTA144EE

Q351

LDTC144EE

Q354

LDTC144EE

Q357

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

RSQ035P03TR

Q606

L1SS400

LDAN222

D358

56P

C448

LRB551V

D610

100k

R650

10k

R477

R36

120

47k

470

R23
220

R80

82k

R70

150k

R28

100

R57

R228

180k

LDTC144EE

Q366

91P

C70

91P

C454

0.001

C444

C100

47P

C65

0.47

C225

0.1U

L53

MMZ1005A152ET

EP8

10k

R380

DB2S31400

D353

100k

R104

R121

22k

150k

R122

390k

R115

R95

120k

C101

47P

C616

3.5P

C117

C466

C465

C61

15P

39P

27P

C19

0.1

C13

0.1

C18

GP214D

IC1

Fin1

Vcc

CP1

GND

CLK

DATA

OSCO

OSCI

GND

CP2

Vcc

Fin2

D50

RN142G

D51

RN142G

D21

KDS114E

D20

KDS114E

1SV323

0.22

C24

D92

BB174

D93

BB174

D130

BB174

D131

Q151

2SC4215

Q225

2SB1132L

LDTA114YE Q221

LDTA114YE Q222

LMUN5213DW1

Q609

SSM3J35FS

Q608

C615

C230

ERTJ0EP473J

C37

0.01

C15

C224

C182

0.01

C57

RB706F

D200

2.7U

2.7k

R47

15k

R479

R410

R411

10k

R609

0.1

C607

C606

BBY58

D22

BBY58

D23

RD07MUS2B

Q54

RD07MUS2B

Q55

10k

J603

1
2
3

330k

R641

150k

R642

J601

8
9

10
11

NJU7056F3

IC50

NJU7056F3

IC400

82N

L26

RD01MUS2B

Q53

D90

KDS114E

JPM1990

NJU7057RB1
IC365

1.8K

R608

330

R607

APM8600FB

IC601

BAT

SETI

THM

GND

DNC

POK

CHG

FLT

2601

MP20

1
2
3
4

30P

C26

33P

C27

10P

C51

C115

0.001

0.01

C96

0.01

C111

R153

220

R71

R69

100k

R152

1.5k

22P

C614

R460

S-1335J30

IC220

VIN

VSS

ON/OFF

SST

VOUT

82k

R111

12k

R112

AVR-M1005C080MT

D613

PON

NOISV

M3VS

TDETV

BATTV

PLSTB

SDATA

SCK

UNLK

RSSIV

DET

SQLO

MODC

R3VS

R3V

T1CON

LOW

PCON

TXMS

TEMPV

ELOW

MOD

T3V

WETIN

BTEMPV

CRESET

POK

CHG

FLT

DCV

PWSW

T3VS

FCON

M3V

LOINV

CPU3V

VIN

WETDET

2nd Lo

2.61V

0.00V

0.61V

0.62V

2.35V

2.27V

2.35V

0.00V

1.33V

4.5W

1.74V

1.0W

1.51V

4.5W

0.63V

1.0W

0.16V

2.65V

2.04V

Input impeedance: 10 M

Power supply voltage: 3.7 V
Charging voltage: 5.0 V

0.00V

2.70V

2.85V

0.00V

2.66V

Charging: 4.81V
Discharging: 3.70V

Charging:5.00V

PWR ON

2.97V

PWR OFF

0.00V

Detected

3.70V

No detected

0.00V

1.84V

0.00V

2.67V

0.00V

2.54V

1.05V

0.00V

1.45V

0.00V

47P

C411

SW-149

S250

MMZ1005Y102CT

EP4

MMZ1005Y102CT

EP6

10k

R651

J250

10P

C410

MPZ2012S102A

EP5

MPZ2012S102A

EP7

J608

J607

MMZ1005Y102CT

EP8

EXTMIC

CLONE

AFOUT

GND

WETDET

PTTIN

MIC UNIT

Summary of Contents for IC-M25

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 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 ...

Search results

Summary of Contents for IC-M25

Reviews:

Related manuals for IC-M25

Brands by name

Popular brands

Icom IC-M25, Service Manual

Search results

Summary of Contents for IC-M25

Reviews:

Related manuals for IC-M25

Brands by name

Popular brands