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Icom IC-M401E, Service Manual

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Icom IC-M401E Service Manual Download Page 15

5 - 3

5-4 RECEIVER ADJUSTMENTS

SENSITIVITY

SQUELCH

• Operating channel : ch16
• [SQUELCH] control : 

Max. counterclockwise

• Connect an SSG to the antenna

connector and set as:

Frequency

: 156.800 MHz

Level

: 3.2 µV* 

(–97 dBm)

Modulation

: 1 kHz

Deviation

: ±3.5 kHz

• Receiving

• Operating channel : ch16
• [SQUELCH] control : 

Max. counterclockwise

• Connect an SSG to the antenna

connector and set as:

Frequency

: 156.800 MHz

Level

: 0.4 µV* 

(–115 dBm)

Modulation

: 1 kHz

Deviation

: ±3.5 kHz

• Receiving

ADJUSTMENT

ADJUSTMENT

ADJUSTMENT CONDITION

MEASUREMENT

VALUE

POINT

UNIT

LOCATION

UNIT

ADJUST

1

1

MAIN-E

MAIN-E

Connect a DC volt-
meter to the check
point CP3.

Connect a DC volt-
meter to the check
point CP5.

Maximum voltage

0.8 V

MAIN-É

MAIN-E

L35, L36
L38, L39

R214

,

*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 channel : ch16
• Output power

: Low

• Connect an audio generator to J4

(pin 3) on the MAIN-E unit with an
AC millivoltmeter and set as:

Frequency

: 1 kHz

Level

: 30 mV

• Set an FM deviation meter as:

HPF

: OFF

LPF

: 20 kHz

De-emphasis

: OFF

Detector

: (P–P)/2

• Transmitting

Rear

Panel

Rear

Panel

Connect an RF
power meter to the
antenna connector.

Connect an FM
deviation meter to
the antenna con-
nector through an
attenuator.

23 W

±4.3 kHz

MAIN

MAIN

R114

R327

Summary of Contents for IC-M401E

Page 1: ...VHF MARINE TRANSCEIVER iC m401e SERVICE MANUAL ...

Page 2: ...er 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 the variable components Turn them slowly and smoothly 4 DO NOT short any cir...

Page 3: ...S 5 1 PREPARATION 5 1 5 2 PLL ADJUSTMENTS 5 2 5 3 TRANSMITTER ADJUSTMENTS 5 3 5 4 RECEIVER ADJUSTMENTS 5 3 SECTION 6 PARTS LIST 6 1 IC M401E 6 1 6 2 HM 132 6 6 SECTION 7 MECHANICAL PARTS AND DISASSEMBLY 7 1 IC M401E 7 1 7 2 HM 132 7 3 SECTION 8 SEMI CONDUCTOR INFORMATION SECTION 9 BOARD LAYOUTS 9 1 VR BOARD 9 1 9 2 SQL BOARD 9 1 9 3 HM 132 9 1 9 4 LOGIC E BOARD 9 2 9 5 MAIN E UNIT 9 4 SECTION 10 B...

Page 4: ...5 0 kHz Spurious emissions Less than 0 25 µW Adjacent channel power More than 70 dB Residual modulation More than 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 3000 Hz RECEIVER Receive system Double conversion superheterodyne system Intermediate frequencies 1st 21 7 MHz 2nd 450 kHz Sensitivity Less than 2 dBµ emf ty...

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

Page 6: ... driver Q10 2SC4226 Power amplifier IC3 RA35H1516M 01 1st IF filter 21 7 MHz FI1 FL 368 FI2 FL 363 FM IF IC IC2 TA31136FN 2nd IF filter FI3 CFWLA450KFFA PLL IC IC1 µPD3140GS AF mute IC4 TC4W66FU RF amplifier Q21 3SK131 Photo coupler IC8 PC357N6T Reset IC IC2 S 80942CNMC System clock 9 8304 MHz X1 CR 739 CPU IC1 HD6433847RB82H SQL board LOGIC E board Speaker VR board EEPROM IC4 HN58X2432TI ...

Page 7: ...T 1 Remove the shield covers MP31 and MP33 2 Unsolder the antenna connector B 1 point 3 Unsolder bottom side A 6 points and side B 1 point as shown below 4 Unscrew 2 screws C and 6 screws D to remove the MAIN E unit A Bottom side A Unsolder Unsolder MP33 A shield cover Antenna connector Bottom side B D C B MP31 B shield cover 2 Slide the case free of the chassis in the direction of the arrow ...

Page 8: ...al is applied to two crystal filters FI1 FI2 to suppress out of band signals and is then amplified at the IF amplifier Q23 The amplified signal is applied to the 2nd mixer circuit IC2 4 1 4 2ND IF AND DEMODULATOR CIRCUITS MAIN E 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 ...

Page 9: ...TER CIRCUITS 4 2 1 MICROPHONE AMPLIFIER CIRCUIT MAIN E 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 amplified at the microphone amplifier IC7 pins6 7 via the analog switch IC4 pins 5 6 A capacitor C302 and resistor R303 are connected to the amplifier...

Page 10: ...d by a crystal oscillator and the divided ratio of the programmable divider IC1 on the MAIN E unit is a dual PLL IC which controls both VCO circuits for Tx and Rx and contains a prescaler pro grammable counter programmable divider phase detector charge pump etc The PLL circuit using a one chip PLL IC MAIN E unit IC1 directly generates the transmit frequency and receive 1st IF frequency with VCOs T...

Page 11: ...ignal is applied to the buffer amplifier Q61 and then passes through the 6 dB oct pre emphasis circuit R417 C416 The signal is applied to the mixer cir cuit IC7 pins 1 2 to mix with signals from the microphone The signal passes through the low pass filter IC8 pins 1 3 and is then applied to the VCO circuit as modulation signal 4 5 LOGIC CIRCUITS LOGIC E BOARD CPU IC1 is an 8 bit signal chip micro ...

Page 12: ...than 160 MHz High Receiving less than 160 MHz Outputs transmit mute signal High While transmitting Input port for DS 100 data Input port for the squelch volume level Input port from the FM IF IC MAIN E unit IC2 for the squelch operation Input port for the connected power supply voltage detection low battery indicator Input port for TX LED control signal 93 94 95 96 97 98 99 Input port for the HM 1...

Page 13: ...MENT 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 40 o...

Page 14: ...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 E 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 C12 C12 Reference frequency adjustment CP1 PLL lock volta...

Page 15: ...meter to the check point CP5 Maximum voltage 0 8 V MAIN É MAIN E L35 L36 L38 L39 R214 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 16: ... L38 CP5 Output power adjustment Frequency deviation adjustment Squelch level check point CP3 Sensitivity check point R214 Squelch level adjustment Sensitivity adjustment L39 J4 PTT AC millivoltmeter Audio generator 4 1 r q ...

Page 17: ...6150003820 COIL LS 440 T L39 6150003820 COIL LS 440 T L42 6200010090 S COIL ELJND R82JF T R1 7030003440 S RESISTOR ERJ3GEYJ 102 V 1 kΩ B R2 7030003440 S RESISTOR ERJ3GEYJ 102 V 1 kΩ B R3 7030003440 S RESISTOR ERJ3GEYJ 102 V 1 kΩ B R4 7030003440 S RESISTOR ERJ3GEYJ 102 V 1 kΩ B R5 7030003680 S RESISTOR ERJ3GEYJ 104 V 100 kΩ T R6 7030003380 S RESISTOR ERJ3GEYJ 331 V 330 Ω T R7 7030003440 S RESISTOR ...

Page 18: ...ISTOR ERJ3GEYJ 823 V 82 kΩ B R317 7030003670 S RESISTOR ERJ3GEYJ 823 V 82 kΩ B R318 7030003680 S RESISTOR ERJ3GEYJ 104 V 100 kΩ B R323 7030003630 S RESISTOR ERJ3GEYJ 393 V 39 kΩ B S Surface mount 6 2 REF ORDER DESCRIPTION M NO NO M Mounted side T Mounted on the Top side B Mounted on the Bottom side MAIN E UNIT R324 7510001670 S THRMISTOR NTCG16 4BH 103KT T R325 7030003570 S RESISTOR ERJ3GEYJ 123 V...

Page 19: ...223 4030011600 S CERAMIC C1608 JB 1E 104K T B S Surface mount C231 4030011810 S CERAMIC C1608 JB 1A 224K T T C232 4030011600 S CERAMIC C1608 JB 1E 104K T T C233 4030008880 S CERAMIC C1608 JB 1H 223K T T C234 4030008880 S CERAMIC C1608 JB 1H 223K T T C235 4510004630 S ELECTROLYTIC ECEV1CA100SR T C236 4030011600 S CERAMIC C1608 JB 1E 104K T T C237 4510005860 S ELECTROLYTIC ECEV1HA2R2SR T C241 403000...

Page 20: ...kΩ T R14 7030003590 S RESISTOR ERJ3GEYJ 183 V 18 kΩ T R15 7030003560 S RESISTOR ERJ3GEYJ 103 V 10 kΩ T R16 7030003590 S RESISTOR ERJ3GEYJ 183 V 18 kΩ T R17 7030003630 S RESISTOR ERJ3GEYJ 393 V 39 kΩ T R18 7030003640 S RESISTOR ERJ3GEYJ 473 V 47 kΩ T R19 7030003440 S RESISTOR ERJ3GEYJ 102 V 1 kΩ T R20 7030003570 S RESISTOR ERJ3GEYJ 123 V 12 kΩ T R21 7030003500 S RESISTOR ERJ3GEYJ 332 V 3 3 kΩ T R22...

Page 21: ...4030006900 S CERAMIC C1608 JB 1H 103K T T C74 4030006900 S CERAMIC C1608 JB 1H 103K T T C75 4030006880 S CERAMIC C1608 JB 1H 472K T T C76 4030006900 S CERAMIC C1608 JB 1H 103K T T C81 4030006860 S CERAMIC C1608 JB 1H 102K T T C82 4030006900 S CERAMIC C1608 JB 1H 103K T T C91 4030006860 S CERAMIC C1608 JB 1H 102K T T C92 4030006860 S CERAMIC C1608 JB 1H 102K T T C93 4030006860 S CERAMIC C1608 JB 1H...

Page 22: ... 471J T B MC1 7700002500 MICROPHONE KUC3523 040245 S1 2260002330 SWITCH SKHHLP014A B S2 2260002340 SWITCH SKHHAM024A T S3 2260002340 SWITCH SKHHAM024A T S4 2260002340 SWITCH SKHHAM024A T W1 9018490010 WIRE 71 98 010 X98 X98 KN T W2 9018490010 WIRE 71 98 010 X98 X98 KN T W3 9024495010 WIRE 24 00 020 W01 W01 KN B W4 9024495020 WIRE 24 04 020 W01 W01 KN B EP1 0910053701 PCB B 5587A REF ORDER DESCRIPT...

Page 23: ...1240 Speaker 045P0803 FG 1 W 3 8900010500 Cable OPC 1046 1 MP1 8210020680 2438 front panel K ASS Y KN black 1 8210020690 2438 front panel L ASS Y KN white 1 MP2 8310050810 2438 window plate KN 1 MP4 8930014280 Speaker net FX706 1 MP5 8110007580 2490 E cover KN 1 MP10 8930055601 2438 key bord A 1 KN 1 MP21 8930052280 O ring AC 2 MP22 8310051220 2438 C bush plate KN 1 MP23 8930055840 2490 grounding ...

Page 24: ...VR MP21 F MP21 F VR BOARD SQL BOARD MP2 F MP22 F MP5 F MC1 F MP31 F R1 VR R1 SQL MP1 F MP16 C MP17 C MP19 C MP31 C IC3 M EP2 L MP25 F MP25 F MP23 F LOGIC E BOARD DS1 L MP1 L W3 F MAIN E UNIT MP23 C MP48 C MP27 C MP2 M MP3 M MP3 L W1 C MP23 C MP32 C W1 C MP5 M MP40 C MP40 C MP40 C MP22 C MP11 C W1 C MP45 C J1 C MP20 C W2 C MP14 C MP26 C MP25 C MP13 C MP40 C MP5 C MP12 C MP33 C D C C D B E E A C B A...

Page 25: ...ate 1 MP12 8820001150 2352 screw 5 MP13 8850001850 ICOM washer Y 5 MP14 8930052340 O ring AE 5 MP15 8930052350 O ring AF 1 MP16 8930056460 2449 MIC sheet 1 MP17 8930054910 2449 SP Rubber 1 MP18 8850001610 Spring washer M4 SUS 1 MP19 8810009260 Screw PH B0 2 6 NI BT 3 MP21 8810009240 Screw BiH M4 10 ZK 1 MP23 8810008900 Screw PH M3 6 NI 1 REF NO CHASSIS PARTS ORDER NO DESCRIPTION QTY REF NO MC1 770...

Page 26: ...SC4116 BL Symbol LL B E C 2SC4226 R25 Symbol R25 D G S 2SK1069 4 Symbol FJ 3SK131 T2 LA Symbol V12 B E C DTA144 EUA Symbol 16 B E C DTA114 EUA Symbol 14 B E C DTC114 EUA Symbol 24 B E C DTC144 EUA Symbol 26 G1 G2 S D B C E B1 C1 C2 E B2 DIODES DA204 U Symbol K DA204 K Symbol K DSA3A1 Symbol Green MA77 Symbol 4B A A A C A A C A C A C C C C MA8062 M Symbol 6 2 HSM88ASR Symbol C3 HVC350BTRF Symbol B0...

Page 27: ... J5 to SQL board 8 1 2 3 4 5 6 7 1 2 3 4 5 1 2 3 GND GND VOL2 VOL1 HVS GND SQLV 5V GND GND VOL2 VOL1 HVS 1 2 3 GND SQLV 5V 9 1 VR BOARD TOP VIEW 9 3 HM 132 TOP VIEW BOTTOM VIEW 9 2 SQL BOARD TOP VIEW BOTTOM VIEW BOTTOM VIEW R1 R2 R3 R4 C1 S4 S2 MC1 S 3 S1 ...

Page 28: ...1 33 35 37 39 SP NC SP BPLVL VCC NC 5V GND GND TMUT TXDET HI LO SQLV PTT BPFV NC NC SQL UNLK PSTB SP SP BEEPM NC VCC 5V RCV SEND GND GND ATIS NC NC NC PTTM RMUTM NC GND PDATA PCK 40 2 39 J4 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 to MAIN E unit J6 W3 OPC 1046 GND ICF3 DATAS DATAS DATAM DATAM J1 6 1 to DS 100 OPC 1087 GND KEYM HANG J3 2...

Page 29: ...9 3 DS1 BOTTOM VIEW The combination of this page and the previous page shows the unit layout in the same configuration as the actual P C Board ...

Page 30: ...D VR BOARD R1 VR W1 OPC 1099 J5 CP15 ANT SP SP SP SP BEEPM NC NC VCC VCC 5V 5V RCV SEND GND GND TMUT GND GND ATIS NC NC NC PTTM PTT BPFV RMUTM NC NC NC SQL UNLK PSTB NC GND PDATA PCK BPLVL TXDET HI LOW SQLV J4 1 2 3 4 6 7 8 9 10 to DS 100 DATAM DATAM DATAS ICF3 DATAS GND 5 1 2 3 4 1 2 3 4 5 6 to LOGIC E board J1 DSC GND VCC DSC J7 DATAM DATAM DATAS DATAS ICF3 GND 9 5 MAIN E UNIT TOP VIEW The combi...

Page 31: ...9 5 CP18 CP19 CP16 CP17 SP SP HV GND to DC POWER to EXT SPEAKER BOTTOM VIEW The combination of this page and the previous page shows the unit layout in the same configuration as the actual P C Board ...

Page 32: ... BOARD IC1 HD6433847RH DS1 TTR5341 Q1 Q3 2SC4116 2 IC4 IC2 IC8 Q31 2SC4116 IC9 LA4425A IC7A IC8A Q4 Q5 2SC4226 2 Q6 2SC4215 Q3 2SC4215 Q7 SC4215 D7 D8 Q10 Q12 Q15 IC3 D12 13 Q13 2SA1577 D14 D21 IC4A PROTECT CTRL D42 DSA3A1 T5 Q55 2SB1132 13 8V REVERSE CTRL Q53 2SA1577 T5 5V CONNECT R5 Q52 DTC144EU R8 R8 REG R5 Q17 SQL BOARD 2nd LO MIC AMP IC10 TA7805S EXT SP INT SP HVS XB15A308 2 HSM88ASR 2 DTC144...

Page 33: ...C 39 PA3 COM4 40 PA2 COM3 41 PA1 COM2 42 PA0 COM1 43 P50 WKP0 SEG1 44 P51 WKP1 SEG2 45 P52 WKP2 SEG3 46 P53 WKP3 SEG4 47 P54 WKP4 SEG5 48 P55 WKP5 SEG6 49 P56 WKP6 SEG7 50 P57 WKP7 SEG8 51 P60 SEG9 52 P61 SEG10 53 P62 SEG11 54 P63 SEG12 55 P64 SEG13 56 P65 SEG14 57 P66 SEG15 58 P67 SEG16 59 P70 SEG17 60 P71 SEG18 61 P72 SEG19 62 P73 SEG20 63 P74 SEG21 64 P75 SEG22 65 P76 SEG23 66 P77 SEG24 67 P80 ...

Page 34: ...0 22 C223 0 1 C343 0 001 C342 0 001 C378 0 001 C377 47p C5 2 2 C25 10 R104 470 C27 1 IC8 NJM4558M 1 2 3 4 5 6 7 8 IC7 NJM4558M 1 2 3 4 5 6 7 8 C315 0 01 C304 0 01 R313 150k R305 100k R311 4 7k R309 100k R291 8 2k R292 22k R293 18k C291 10 L3 2 7µH R9 2 2k C316 10 C126 0 001 C127 18p C130 27p C133 5p C144 0 001 C141 27p C121 18p C124 18p C7 0 001 MP1 1 2 3 4 5 6 C41 39p C157 0 001 C174 2p C177 3p C...

Page 35: ...M024A R3 15k R4 33k S2 SKHHAM024A S1 SKHHLP014A S3 SKHHAM024A 1 2 1 2 3 4 W2 W1 W3 W4 UP Y DOWN Z 16 C PTT MIC PTT to LOGIC E board J3 to MAIN E unit J4 MICG MIC GND KEYM GND CHASSIS UNIT W1 OPC 1081 Black OPC 1082 White Y ON 2 0V Z ON 3 0V 16 C ON 3 8V 11 3 HM 132 ...

Page 36: ......

Page 37: ...S 14013MZ C2 2004 Icom Inc 1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan ...

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