Icom IC-M402 Service Manual Download Page 32

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9-5 MAIN UNIT

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TOP VIEW

C259

C109

C111

L14

C107

D10

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MP1

L12

R71
[TX-PWR]

FI1

FI2

CP2

[SQL]
R16

[REF]

C36

CP1

[MOD]
R138

FI3

C80

C83

EXT-MIC

D11

VR-A/B

C185

C186

IC9

Q12

CP3

B-5583C

L19

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IC2

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IC8

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IC6

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IC4

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IC1

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R56

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C71

C11

C10

L16

L17

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C254

R188

C224

C223

R163

ICOM

PTT

MICG

MIC

GND

from Smart Mic HM-129

VCC

AF/MIC

MICG

PTTC

from/to Optional unit
HM-127

SP+

—

BPLVL

HVS

—

GND

TMUT

TXDET

HI/LO

SQLV

PTT

BPFV

RMUTS

SMUTE

SQL

UNLK

PSTB

SP+

BEEPM

—

HVS

RCV

SEND

GND

DSENC

DSDEC

WXDEC

PTTS

PTTM

RMUTM

MMUTE

GND

PDATA

PCK

to Logic unit J4

HVS

VOL1

VOL2

GND

SQLV

GND

from/to VR-A,
VR-B boards

Summary of Contents for IC-M402

Page 1: ...SERVICE MANUAL VHF MARINE TRANSCEIVER ...

Page 2: ...T reverse the polarities of the power supply when connecting the transceiver DO NOT apply an RF signal of more than 20 dBm 100mW to the antenna connector This could damage the trans ceiver s front end REPAIR NOTES 1 Make sure a problem is internal before disassembling the transceiver 2 DO NOT open the transceiver until the transceiver is dis connected from its power source 3 DO NOT force any of th...

Page 3: ...USTMENTS 5 2 5 3 TRANSMITTER ADJUSTMENTS 5 3 5 4 RECEIVER ADJUSTMENTS 5 3 SECTION 6 PARTS LIST 6 1 IC M402 6 1 6 2 HM 127 OPTIONAL UNIT 6 6 6 3 HM 129 6 7 SECTION 7 MECHANICAL PARTS AND DISASSEMBLY 7 1 IC M402 7 1 7 2 HM 129 7 3 7 2 HM 127 OPTIONAL UNIT 7 3 SECTION 8 SEMI CONDUCTOR INFORMATION SECTION 9 BOARD LAYOUTS 9 1 VR A BOARD 9 1 9 2 VR B BOARD 9 1 9 3 HM 129 9 1 9 4 LOGIC BOARD 9 2 9 5 MAIN...

Page 4: ...lation Variable reactance frequency modulation Maximum frequency deviation 5 0 kHz Frequency error 10 ppm Spurious emissions 70 dBc Adjacent channel power 70 dB Residual modulation 40 dB Audio harmonic distortion Less than 10 at 60 deviation Audio frequency response 1 dB to 3 dB of 6 dB octave from 300 Hz to 2500 Hz RECEIVER Receive system Double conversion superheterodyne system Intermediate freq...

Page 5: ...57 200 157 250 157 300 157 350 157 400 156 025 156 075 156 075 156 125 156 125 156 175 156 175 156 225 156 225 156 275 156 275 156 325 156 325 156 375 156 425 156 475 156 525 156 575 156 625 Receive 157 050 161 700 157 100 161 750 157 150 161 800 161 850 161 900 161 950 162 000 160 625 160 675 156 075 160 725 156 125 160 775 156 175 160 825 156 225 160 875 156 275 160 925 156 325 156 375 156 425 1...

Page 6: ...ALFY450E 1st mixer Q1 3SK272 Antenna switching circuit 1st IF filter FI1 FI2 FL 310 YGR amplifier Q11 2SC3268 DSC decoder IC6 NJM2211M AF power amplifier IC9 LA4425A Pre driver Q10 2SC3775 3 PLL IC IC2 MPD3140GS EEPROM IC2 HN58X2432TI VR A board VR B board MAIN MPU IC1 HD6473847RH System clock X1 CR 691 Speaker Reset IC IC6 NJM2211M LOGIC board ...

Page 7: ...U IC1 µPD789405AGK A30 9EU Data buffer circuit System clock X1 CSTCC4 91MG 8V regulator IC6 TA7808F Dimmer circuit Reset IC IC7 S 80928ANMP MIC amplifier IC4 NJM2125F 5V regulator IC5 TA78L05F Volume IC IC3 M62429FP AF MIC switch IC9 TC4W53FU AF amplifier IC2 TA7368F ...

Page 8: ... screw 10 12 kg of torque MUST be applied to ensure water resistance REMOVING THE MAIN UNIT 1 Unsolder DC cable 4 points and antenna connector B 2 points as shown below 2 Unscrew 2 screws C and 6 screws D to remove the MAIN unit A C B D 2 Slide the case free of the chassis in the direction of the arrow ...

Page 9: ... to two crystal filters FI1 FI2 to suppress out of band signals and is then amplified at the IF amplifier Q2 The amplified signal is applied to the 2nd mixer circuit IC1 4 1 4 2ND IF AND DEMODULATOR CIRCUITS MAIN UNIT The 2nd mixer circuit converts the 1st IF signal to a 2nd IF signal A double superheterodyne system which converts receive signals twice improves the image rejection ratio and obtain...

Page 10: ...coder func tion When a 1050 Hz signal is detected by software decode the CPU LOGIC unit IC1 controls beep tones and the ALT indicator 4 2 TRANSMITTER CIRCUITS 4 2 1 MICROPHONE AMPLIFIER CIRCUIT MAIN UNIT The microphone amplifier circuit amplifies audio signals with 6 dB octave pre emphasis from the microphone to a level needed at the modulation circuit The AF signals from the microphone are amplif...

Page 11: ...gnals with the reference oscilla tor frequency The PLL IC detects the out of step phase and output from pins 8 for Tx and Rx The reference frequency 21 25 MHz is oscillated at X2 MAIN unit 4 3 2 TX AND RX LOOP MAIN UNIT The generated signal at the VCO Q4 Q5 Q6 D1 D4 enters the PLL IC IC2 pin 2 and is divided at the pro grammable divider section and is then applied to the phase detector section The...

Page 12: ...ARD CPU IC1 is an 8 bit signal chip micro computer and contains LCD driver serial I O timer A D converter programmable I O ROM and RAM SYSTEM CLOCK CIRCUIT X1 is a ceramic oscillator and ocillate 9 8304 MHz system clock for the CPU IC1 RESET CIRCUIT IC6 is a reset IC When turn power ON IC6 outputs a reset signal LOW pulse to the CPU IC1 pin 15 via the RES line LOW BATTERY DETECTOR HVS voltage is d...

Page 13: ...pply voltage detection low battery indicator 92 93 94 95 96 97 98 99 Input port for TX LED control signal Input port for the smart mic functions 2 02 V UP is pushed 3 00 V DN is pushed 3 84 V 16 9 is pushed Input port for the PTT switch from HM 129 Low While PTT is pushed Input port for the DTRS switch Low While DISTRESS switch is pushed Input port for the DSC switch Low While DSC switch is pushed...

Page 14: ...EQUIPMENT Audio generator Standard signal generator SSG Oscilloscope AC millivoltmeter External speaker Attenuator Dummy load GRADE AND RANGE Frequency range 300 3000 Hz Measuring range 1 500 mV Frequency range 0 1 300 MHz Output level 0 1 µV 32 mV 127 to 17 dBm Frequency range DC 20 MHz Measuring range 0 01 20 V Measuring range 10 mV 10 V Input impedance 4 Ω Capacity 5 W or more Power attenuation...

Page 15: ... Output power Low Transmitting Operating channel ch16 Output power Low Connect an RF power meter or a 50 Ω dummy load to the antenna connector Transmitting MAIN Rear Panel Connect a digital multi meter or oscil loscope to the check point CP1 Loosely couple the frequency counter to the antenna con nector 1 8 V 1 6 V 156 8000 MHz MAIN Verify C36 C36 Reference frequency adjustment CP1 PLL lock voltag...

Page 16: ...onnect a DC volt meter to the check point CP2 Less than 0 32 µV 1 0 V MAIN Verify R16 This output level of a standard signal generator SSG is indicated as SSG s open circuit 5 3 TRANSMITTER ADJUSTMENTS OUTPUT POWER FREQUENCY DEVIATION ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITION MEASUREMENT VALUE POINT UNIT LOCATION UNIT ADJUST 1 1 Operating channel ch16 Output power High Transmitting Operating chan...

Page 17: ...5 4 J2 R71 Output power adjustment PTT 4 1 r q R138 Frequency deviation adjustment AC millivoltmeter 2 200 mV Audio generator 300 Hz to 3 kHz R16 Squelch level adjustment CP2 Squelch level check point ...

Page 18: ...ISTOR ERJ3GEYJ 103 V 10 kΩ S Surface mount R61 7030003560 S RESISTOR ERJ3GEYJ 103 V 10 kΩ R62 7030004120 S RESISTOR ERJ3GEYJ 203 V 20 kΩ R63 7030004120 S RESISTOR ERJ3GEYJ 203 V 20 kΩ R64 7030004120 S RESISTOR ERJ3GEYJ 203 V 20 kΩ R65 7030004120 S RESISTOR ERJ3GEYJ 203 V 20 kΩ R66 7030004120 S RESISTOR ERJ3GEYJ 203 V 20 kΩ R67 7030004120 S RESISTOR ERJ3GEYJ 203 V 20 kΩ R68 7030004120 S RESISTOR ER...

Page 19: ...D21 1790000660 S DIODE MA728 TX FI1 2010002420 MONOLITH 21R15AB FL 310 FI2 2010002420 MONOLITH 21R15AB FL 310 FI3 2020001680 CERAMIC ALFY450E X1 6070000210 S DISCRIMINATOR CDBCA450CX24 X2 6050010800 S XTAL CR 659 21 25 MHz L1 6200003050 S COIL NL 322522T R82J 3 L2 6200002410 S COIL NL 252018T 056J L3 6200002430 S COIL NL 252018T 082J L4 6200003090 S COIL NL 322522T 2R7J 3 L5 6200008190 S COIL 0 25...

Page 20: ... 104 V 100 kΩ R110 7030003630 S RESISTOR ERJ3GEYJ 393 V 39 kΩ R111 7030003580 S RESISTOR ERJ3GEYJ 153 V 15 kΩ R112 7030003480 S RESISTOR ERJ3GEYJ 222 V 2 2 kΩ R113 7030003680 S RESISTOR ERJ3GEYJ 104 V 100 kΩ R121 7030003480 S RESISTOR ERJ3GEYJ 222 V 2 2 kΩ R122 7030003590 S RESISTOR ERJ3GEYJ 183 V 18 kΩ R123 7030003650 S RESISTOR ERJ3GEYJ 563 V 56 kΩ R124 7030003440 S RESISTOR ERJ3GEYJ 102 V 1 kΩ ...

Page 21: ...08 JB 1H 102K T A C104 4030006860 S CERAMIC C1608 JB 1H 102K T A C105 4010007630 CERAMIC HM60SJ CH 270J 500V C106 4010005790 CERAMIC HM60SJ YB 102K 500V C107 4010005500 CERAMIC HM60SJ CH 150J 500V C108 4010005430 CERAMIC HM60SJ CH 050C 500V C109 4010008540 CERAMIC HM60SJ CH 240J 500V C111 4010005420 CERAMIC HM60SJ CH 040C 500V C112 4030006860 S CERAMIC C1608 JB 1H 102K T A C113 4030007090 S CERAMI...

Page 22: ...K T A C245 4030011600 S CERAMIC C1608 JB 1C 104KT N C246 4030006870 S CERAMIC C1608 JB 1H 222K T A C249 4030006860 S CERAMIC C1608 JB 1H 102K T A C251 4030006860 S CERAMIC C1608 JB 1H 102K T A C252 4030006860 S CERAMIC C1608 JB 1H 102K T A C253 4030006900 S CERAMIC C1608 JB 1E 103K T A C254 4030006860 S CERAMIC C1608 JB 1H 102K T A C255 4030006860 S CERAMIC C1608 JB 1H 102K T A C256 4030006860 S C...

Page 23: ...J3GEYJ 104 V 100 kΩ R54 7030003440 S RESISTOR ERJ3GEYJ 102 V 1 kΩ R55 7030003640 S RESISTOR ERJ3GEYJ 473 V 47 kΩ R56 7030003440 S RESISTOR ERJ3GEYJ 102 V 1 kΩ R57 7030003520 S RESISTOR ERJ3GEYJ 472 V 4 7 kΩ R58 7030003280 S RESISTOR ERJ3GEYJ 470 V 47 Ω R59 7030003580 S RESISTOR ERJ3GEYJ 153 V 15 kΩ R60 7030003560 S RESISTOR ERJ3GEYJ 103 V 10 kΩ R61 7030003630 S RESISTOR ERJ3GEYJ 393 V 39 kΩ R62 70...

Page 24: ...20 LCD CONTACT SRCN 2320 SP N W R1 7010006890 RESISTOR R20J 12 K Ω R2 7010006880 RESISTOR R20J 6 8K Ω R3 7010006900 RESISTOR R20J 15 K Ω R4 7010006910 RESISTOR R20J 33 K Ω C1 4010008030 CERAMIC DD104 B 471K 50V MC1 7700002500 MICROPHONE KUC3523 040245 KN S1 2260002330 SWITCH SKHHLP014A S2 2260002340 SWITCH SKHHAM024A S3 2260002340 SWITCH SKHHAM024A S4 2260002340 SWITCH SKHHAM024A W1 9018490010 WIR...

Page 25: ... MP7 7 1 IC M402 MC1 0800005970 Microphone HM 129B BLACK 1 0800005980 Microphone HM 129W WHITE 1 SP1 2510001110 Speaker 045P1601 1 W3 8900010500 Cable OPC 1046 1 MP1 8210017690 2438 Front panel BLACK 1 8210017770 2438 Front panel A WHITE 1 MP2 8930054640 2438 Key board 1 MP3 8310050810 2438 Window plate 1 MP4 8610011030 Knob N 286 BLACK 2 8610011040 Knob N 286 A WHITE 2 MP5 8930014280 SP net 1 MP6...

Page 26: ...C BORAD MP2 L VR A BOARD DS1 L MP1 L MP3 L MP14 C W3 F MP14 C MP14 C W1 C MP14 C MP15 C MP2 M MP10 C MP16 C IC3 M W1 C MP20 C MP3 C MP5 C J1 C W2 C MAIN UNIT MP17 C MP7 C MP2 C MP8 C UNIT abbreviations C CHASSIS PARTS L LOGIC BOARD M MAIN UNIT VA VR A BOARD VB VR B BOARD F FRONT UNIT MP15 C W1 C MP4 F R1 VB MP10 F MP3 F MP11 F MP9 F MP8 F R1 VA MP1 F MP13 F MP3 M MP4 M MP5 F 7 2 ...

Page 27: ...049820 2417 Window plate 1 MP3 8930053510 2417 key board 1 MP4 8930053540 2417 PTT rubber 1 MP5 8930053990 2417 PTT sheet 1 MP6 8930053550 2417 PTT holder 1 MP7 8930053520 2417 top key 1 MP8 8930053760 2417 key plate 1 MP9 8930011900 SP net A 1 MP10 8930039000 1757 sheet 1 MP11 8810009180 Screw FT B0 M2 5 NI ZU 3 MP12 8930053750 2417 plate 1 MP13 8210017250 2417 rear panel BLACK 1 8210017300 2417 ...

Page 28: ...B E C 2SA1576 R Symbol FR 2SA1588 Symbol ZG B E C B E C 2SC4081 R Symbol BR 2SC4116 BL Symbol LL B E C 2SC4226 R25 Symbol R25 D G S 2SK1069 Symbol FJ G1 G2 S D 3SK272 Symbol DU B E C DTA144 EU Symbol 16 B E C DTA114 EUA Symbol 14 B E C DTC114 EU Symbol 24 DTB123 EK Symbol F12 B E C DTC144 EU Symbol 26 B E C DIODES DA204 U Symbol K MA77 Symbol 4B A K HVU350 Symbol 4 HSM88ASR Symbol C3 A C 1SS355 Sy...

Page 29: ...OARD LAYOUTS 9 1 VR A BOARD 9 2 VR B BOARD 9 3 HM 129 TOP VIEW BOTTOM VIEW 1 B 5585B R1 W1 HV GND VOL2 VOL1 HVS 5 W1 1 to Main unit J5 1 W1 R1 B 5586B GND SQLV 5V 3 W1 1 to Main unit J5 R1 R2 R3 R4 C1 S4 S2 MC1 S 3 S1 ...

Page 30: ...45 C21 R11 R83 R14 R16 R13 R19 R22 R18 R21 R12 R15 R12 IC5 R75 R74 C20 R10 C11 IC4 C27 C13 R35 C2 R36 R26 R43 C25 Q7 R77 R3 C7 J3 Q2 Q3 SP SP to Front unit SP1 to Front unit SP1 C1 IC3 J4 J3 J1 J2 B5584B ICOM BE 1 1 1 SP SP BPLVL HVS 5V GND GND TMUT TXDET HI LO SQLV PTT BPFV RMUTS SMUTE SQL UNLK PSTB SP SP BEEPM HVS 5V RCV SEND GND GND DSENC DSDEC WXDEC PTTS PTTM RMUTM MMUTE GND PDATA PCK 40 2 39 ...

Page 31: ...9 3 BOTTOM VIEW DS1 DS3 DS4 DS5 DS6 DS7 DS8 ...

Page 32: ...C146 R159 C230 R162 C229 R104 C142 C147 C145 C144 R105 IC6 C168 R169 R140 R142 R143 R141 C156 C148 C136 C150 C170 C141 R103 R102 Q21 Q28 C149 C181 C84 C182 R151 R152 C183 C184 C176 C171 C270 C74 Q11 L30 L31 R62 D7 L10 Q10 C77 R64 C189 C128 R170 R82 R90 R91 IC5 IC4 Q20 C133 C135 R92 C134 R89 Q19 C131 R85 R86 R83 R87 R81 R84 R88 Q18 D12 C132 C130 C129 Q23 C34 C39 R165 C227 R80 C120 C121 Q25 Q22 C33 ...

Page 33: ...C155 IC7 R150 R149 Q26 D14 R134 C255 C262 C261 MP3 R168 R195 R196 R194 R193 C265 C264 R169 R32 R29 R30 R31 C41 C42 C28 C27 C23 C257 C18 C25 Q2 R13 R12 R19 R17 R18 C275 R10 C272 R36 R34 R35 R20 C31 C24 R15 C26 R21 C16 C17 R11 Q4 C46 C44 C14 C266 R9 C7 L25 L24 L21 C217 C222 C218 C220 D20 C221 L22 C216 C12 R8 R53 C249 C200 C199 C201 R191 D16 D5 D6 C49 C48 R40 D2 D1 D9 R79 C104 C93 D8 C103 R78 R73 C88...

Page 34: ...9 6 HM 127 OPTIONAL UNIT TOP VIEW 9 6 ...

Page 35: ... BOTTOM VIEW 1 40 41 60 61 8 5 4 1 5 1 10 6 4 1 8 5 80 1 20 21 4 5 8 RRXDA PWRC RTXDA PTTC GND MICG AF MIC VCC 1 8 to IC M402 MAIN unit J2 and LOGIC board J1 J1 9 7 ...

Page 36: ...MUTE AF MUTE AF MUTE GATE CTRL IC4C BU4066BCFV IC4A BU4066BCFV IC4B BU4066BCFV RMUTM MMUTE IC5A BU4066BCFV IC5B BU4066BCFV IC5D BU4066BCFV IC5C BU4066BCFV RMUTS SMUTE Q20 2SK1069 4 PTTS PTTM PTT Q18 DTC144EU D12 1SS355 PTTC Q19 DTA144EU FI1 2 FL310 Q2 2SC2714 Y SQL FI3 ALFY450E IC1 TA31136FN D5 MA77 D6 MA77 IC3 SC 1302 D8 D9 HSM88ASR HV Q11 2SC3268 Q10 2SC3775 3 TXDET HI LO T5 TMUT Q16 DTC144EU Q1...

Page 37: ...12 SEG11 SEG8 SEG7 SEG10 SEG9 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 SEG0 DIM2 DIM1 EDA ECK BPLVL ICFC EXSTB PDATA PSTB R80 10 k R81 10 k R82 100 k C10 0 027 C14 0 01 STRB 1 DATA 2 CLK 3 Q1 4 Q2 5 Q3 6 Q4 7 VSS 8 QS 9 Q S 10 Q8 11 Q7 12 Q6 13 Q5 14 VDD 16 5V 5V NMEAI NMEAI HVS HVS DTRS DSC 5V 5V DSENC DSENC1 DSENC2 DSENC3 DSENC4 DSENC5 DSENC6 DSENC7 DSENC 5V 5V UP DN HVS PTT KEYM KEYM 5V 5V CH16 CHWX 5V NM...

Page 38: ... R112 2 2 k R103 47 C245 0 1 C152 0 01 R109 100 k C146 0 22 C150 0 0022 C151 0 1 R105 10 k C144 0 0068 C230 0 022 C229 0 0022 R159 1 k CP3 R106 33 k C231 0 0068 V IN I O 1 O I 2 O I 3 I O 4 CONT B 5 CONT C 6 VEE 7 I O 8 O I 9 O I 10 I O 11 CONT D 12 CONT A 13 VDD 14 IC5 BU4066BCFV R93 1M R94 1M R95 1M C137 0 1 R96 2 7 k Q21 2SC4116 BL R98 470 k C138 0 022 C139 0 022 C141 10 R102 1 k R101 15 k 5V V...

Page 39: ... P27 INTP3 CPT5 P26 INTP2 TO5 P25 INTP1 TI1 P24 INTP0 TI0 P23 CMPTOUT0 TO P22 SI RXD P21 SO TXD P20 SCK ASCK P53 P52 P51 P50 40 AVREF 21 S10 80 P40 KR0 SEG10 SEG19 SEG18 SEG17 SEG16 SEG15 SEG14 SEG13 SEG12 SEG11 10k R7 10k R6 10 C1 SKQLLC S4 CP7 10k R8 PTT 10k R9 CH16 6 8k R20 10KEY S7 PTT 22 C37 0 1 C28 10 C30 AF5V 22 C35 5V 0 001 C29 DTC144EU Q5 DTB123EK Q6 100k R45 0 01 C53 1M R65 1M R66 47p C3...

Page 40: ...ASSIS UNIT W1 to MAIN unit J4 to LOGIC board J3 PTT MIC UP DN 16 9 MC1 C1 470 P R1 12 k W2 W1 S1 S2 R2 6 8 k S3 R3 15 k R4 33 k S4 PTT MICG MIC GND 1 2 3 4 PTT MICG MIC PTTG KEYM GND 1 2 UP_ON 2 0V DN_ON 3 0V 16 9_ON 3 8V ...

Page 41: ......

Page 42: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan S 13716IZ CD 2001 Icom Inc ...

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