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SERVICE

MANUAL

VHF MARINE TRANSCEIVER

M302

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Summary of Contents for IC-M302

Page 1: ...SERVICE MANUAL VHF MARINE TRANSCEIVER M302 ...

Page 2: ...8810004540 Screw BiH M3x8 SUS IC M302 Chassis 10 pieces Addresses are provided on the inside back cover for your convenience 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 circuits or electr...

Page 3: ... 5 1 PREPARATION 5 1 5 2 PLL ADJUSTMENTS 5 2 5 3 TRANSMITTER ADJUSTMENTS 5 3 5 4 RECEIVER ADJUSTMENTS 5 4 SECTION 6 PARTS LIST 6 1 IC M302 6 1 6 2 HM 141 6 5 SECTION 7 MECHANICAL PARTS AND DISASSEMBLY 7 1 CABINET PARTS 7 1 7 2 HM 141 7 3 SECTION 8 SEMI CONDUCTOR INFORMATION SECTION 9 BOARD LAYOUTS 9 1 MAIN UNIT 9 1 9 2 LOGIC UNIT 9 3 9 3 VR BOARD 9 5 9 4 SQL BOARD 9 6 9 5 HM 141 9 7 SECTION 10 BLO...

Page 4: ... deviation 5 0 kHz Frequency tolerance 10 ppm Spurious emissions 70 dBc High power 56 dBc Low power 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 frequencies 1st 21 7 MHz 2nd 450 kHz...

Page 5: ...57 350 157 400 Rx only 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 Receive 157 050 161 650 161 700 157 100 161 750 157 150 161 800 161 850 161 850 161 900 161 950 162 000 162 000 160 625 160 675 156 075 160 725 156 125 160 775 156 175 160 825 160 825 160 875 156 275 160 925 156 325 156 375 156 425 156 475 USA 70 3 ...

Page 6: ...R25 5V regulator IC9 TA7805S Pre driver Q17 2SC4215 O DSC decoder IC3 NJM2211M FM IF IC IC1 TA31136FN Analog switch IC7 TC4W66F Ceramic bandpass filter FI3 ALFY450E SQL board LOGIC board VR board EEPROM IC4 BR24L32FV W Dimmer controller Q2 2SB1132 R Q3 Q4 2SC4116 BL Reset IC IC5 BD5242FVE TR System clock X1 CR 769 Photo coupler IC2 PC357N6T MAIN CPU IC1 M37560MFA 303GP Buffer amplifier IC6 NJM2904...

Page 7: ...ection of the arrow REMOVING THE MAIN UNIT 1 Unsolder the external speaker cable F 2 points and DC cable G 2 points on the bottom side 2 Unsolder the antenna connector B 3 points 3 Remove a clip C 4 Unscrew 2 screws D and 7 screws E to remove the MAIN unit I J K H REMOVING THE LOGIC BOARD 1 Remove 2 cables I K 2 Unsolder 2 points H 3 Unscrew 4 screws J to remove the LOGIC BOARD ...

Page 8: ...to suppress out of band signals and is then amplified at the IF amplifier Q4 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 obtains stable receiver gain The FM IF...

Page 9: ... a 1050 Hz signal is detected by software decode the CPU LOGIC BOARD 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 amplified at the micropho...

Page 10: ...PU on the LOGIC BOARD and compares the phases of VCO signals with the reference oscillator 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 Q13 Q14 D11 D14 enters the PLL IC IC8 pin 2 and is divided at the pro grammable divider sectio...

Page 11: ...e I O ROM and RAM The CPU controls to display characters on the LCD too SYSTEM CLOCK CIRCUIT X1 is a ceramic oscillator and oscillate 7 9872 MHz system clock for the CPU IC1 RESET CIRCUIT IC5 which is a reset IC outputs a reset signal HIGH pulse signal to the CPU IC1 pin 33 from pin 1 when the trans ceiver turns power ON LOW BATTERY DETECTOR HVS voltage is divided by R14 and R15 and is applied to ...

Page 12: ... port for the CH WX switch Low While the CH WX switch is pushed Input port for the CH16 switch Low While the CH16 switch is pushed Input port for the switch Low While the switch is pushed Input port for the switch Low While the switch is pushed Input port for the DSC switch Low While the DSC switch is pushed 46 47 49 50 51 52 53 54 62 88 92 95 Input port for the Distress switch Low While the Distr...

Page 13: ...UIPMENT 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 4...

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 Rear Panel Connect a digital multi meter or oscil loscope to the check point LV Loosely couple the frequency counter to the antenna con nector 1 8 V 1 6 V 156 8000 MHz MAIN Verify C257 C36 Reference frequency adjustment CP1 PLL lock voltag...

Page 15: ...nect an audio generator to J2 pin 3 on the MAIN unit with an AC millivoltmeter and set as Frequency 1 kHz Level 40 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 5 W 4 3 kHz MAIN MAIN R135 R184 R135...

Page 16: ...z Deviation 3 0 kHz Receiving ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITION MEASUREMENT VALUE POINT UNIT LOCATION UNIT ADJUST 1 MAIN Connect the dis tortion meter to the EXT SP jack with a 4 Ω load Connect a DC volt meter to the check point RSSI Maximum voltage MAIN L6 L7 L8 L9 This output level of a standard signal generator SSG is indicated as SSG s closed circuit L6 Receiver sensitivity adjustment...

Page 17: ... T R42 7030003560 S RESISTOR ERJ3GEYJ 103 V 10 kΩ T R43 7030003560 S RESISTOR ERJ3GEYJ 103 V 10 kΩ T R51 7030003680 S RESISTOR ERJ3GEYJ 104 V 100 kΩ T R52 7030003800 S RESISTOR ERJ3GEYJ 105 V 1 MΩ T R53 7030003560 S RESISTOR ERJ3GEYJ 103 V 10 kΩ T R54 7030003540 S RESISTOR ERJ3GEYJ 682 V 6 8 kΩ T R55 7030003560 S RESISTOR ERJ3GEYJ 103 V 10 kΩ T R56 7030003560 S RESISTOR ERJ3GEYJ 103 V 10 kΩ T R61 ...

Page 18: ...RESISTOR ERJ3GEYJ 103 V 10 kΩ T R31 7030003200 S RESISTOR ERJ3GEYJ 100 V 10 Ω T R32 7030003540 S RESISTOR ERJ3GEYJ 682 V 6 8 kΩ T R33 7030003450 S RESISTOR ERJ3GEYJ 122 V 1 2 kΩ T R34 7030003450 S RESISTOR ERJ3GEYJ 122 V 1 2 kΩ T R35 7030003680 S RESISTOR ERJ3GEYJ 104 V 100 kΩ T R36 7030003460 S RESISTOR ERJ3GEYJ 152 V 1 5 kΩ T R37 7030003400 S RESISTOR ERJ3GEYJ 471 V 470 Ω T R38 7030003480 S RESI...

Page 19: ...26 4030007010 S CERAMIC C1608 CH 1H 100D T T C28 4030011600 S CERAMIC C1608 JB 1E 104K T T S Surface mount 6 3 REF ORDER DESCRIPTION M NO NO MAIN UNIT C29 4030009500 S CERAMIC C1608 CH 1H 0R5B T T C30 4030009520 S CERAMIC C1608 CH 1H 020B T T C31 4030007010 S CERAMIC C1608 CH 1H 100D T T C32 4030009530 S CERAMIC C1608 CH 1H 030B T T C34 4030009910 S CERAMIC C1608 CH 1H 040B T T C35 4030006850 S CE...

Page 20: ...30008470 S CERAMIC C1608 JB 1H 272K T T C236 4030006850 S CERAMIC C1608 JB 1H 471K T T C241 4030009920 S CERAMIC C1608 CH 1H 050B T T C242 4030006860 S CERAMIC C1608 JB 1H 102K T T C243 4030007050 S CERAMIC C1608 CH 1H 220J T T C244 4030007050 S CERAMIC C1608 CH 1H 220J T T C245 4030007050 S CERAMIC C1608 CH 1H 220J T T C246 4030006860 S CERAMIC C1608 JB 1H 102K T T C247 4550006540 S TANTALUM ECST...

Page 21: ...NE KUC3523 040245 FG T S1 2260002780 SWITCH SKHHLPA010 FG B S2 2260002790 SWITCH SKHHAMA010 FG T S3 2260002790 SWITCH SKHHAMA010 FG T S4 2260002790 SWITCH SKHHAMA010 FG T W1 9027150010 WIRE 71 98 010 X98 X98 FG B W2 9027150010 WIRE 71 98 010 X98 X98 FG B W3 9027150020 WIRE 24 00 020 W01 W01 FG T W4 9027150030 WIRE 24 04 020 W01 W01 FG T EP1 0910056860 PCB B 6067 S Surface mount 6 5 REF ORDER DESCR...

Page 22: ... Cable OPC 891 1 MP1 8950005110 2289 MIC hanger 1 MP2 8010017250 2040 Mobile bracket A Black 1 8010019400 2040 Mobile bracket B White 1 8010017250 2040 Mobile bracket Gray 1 MP3 8610010561 2040 Knob bolt 1 Black 2 8610010591 2040 Knob bolt A 1 White 2 8820001271 2040 Knob bolt C 1 Gray 2 MP4 8810004700 Screw PH A0 M3 16 SUS 2 MP5 8810001490 Screw PH A0 M5 20 SUS 2 MP6 8850000180 Flat washer M5 SUS...

Page 23: ...S R1 V MP12 F MP12 F MP8 F MP13 F R1 V MP5 F SP1 F MP6 C MP1 F MP11 C MP16 C MP4 C MP15 C MP15 C MP16 C LOGIC BOARD MAIN UNIT MP2 A MP3 A MP3 A MP18 C MP16 C MP2 F R1 S MP4 F MP2 L DS1 L MP3 L MP1 L EP2 L MP2 C MP10 C MP13 C MP8 C MP12 C IC4 M MP3 C W3 F MP12 C MP12 C D F E D F B E 51 2 Unit mm inch 137 5 13 32 132 5 3 16 153 6 1 32 67 2 5 8 30 7 1 7 32 86 3 3 13 32 ...

Page 24: ...0920 2715 PTT rubber Black White 1 8930061160 2715 PTT rubber A Gray 1 MP5 8930061970 2715 A PTT holder 1 MP6 8930060940 2715 rubber Black White 1 8930061810 2715 rubber A Gray 1 MP7 8930060930 2715 main seal 1 MP8 8610011600 2715 hanger knob 1 MP9 8930060950 2715 bush plate 1 MP10 9830060990 2715 MIC sheet 1 MP13 8930060960 O ring AY 5 MP14 8930060970 O ring AZ 1 MP15 8820001260 2715 screw 2 6x18...

Page 25: ...bol QO 2SB1132 R Symbol BARB 2SC4116 BL Symbol LL 2SC4226 R25 Symbol R25 DTA144EU Symbol 16 DTC144EU Symbol 26 3SK131 L Symbol V12 DTC114EU Symbol 14 DTC114 TU Symbol 04 FMW1 Symbol W1 A1 C A2 pink A C A C A C A C green 1SS321 Symbol F9 1SV214 Symbol T1 1SV307 Symbol TX 1SS355 Symbol A HSM88ASR Symbol C3 HVC350B Symbol BO MA77 Symbol 4B XB15A308 Symbol T8 DSA3A1 DA204 K Symbol K ...

Page 26: ...J2 X1 F12 MP1 FI1 MP3 L9 REF PWR DEV L31 C171 C174 L32 D1 C7 C3 C4 L2 L6 L7 L8 W2 L1 C8 C6 C5 L3 D2 LOGIC B 6015C W1 C211 C213 MIC F13 RSSI VR SQL IC9 IC6 D25 C75 R48 C72 C71 C70 R50 R44 C249 C250 C77 R216 C248 R88 C117 R185 C236 C247 D11 C121 C120 C258 R86 C254 R214 C252 R36 Q4 R34 C55 R32 C48 C47 L10 Q2 C50 C49 R27 C244 C245 L35 R201 C242 C136 C42 L12 L13 C80 C44 R107 D17 R106 D16 C139 C11 C10 R...

Page 27: ... BOTTOM VIEW SP SP HV GND Gray cable to the external speaker to the power supply Blue cable Red cable IC4 Black cable OUT VCC2 VCC1 IN 9 2 ...

Page 28: ...42 R51 C7 R16 IC1 C25 R52 R41 BE SP SP B 6096A C18 IC4 IC6 C3 C22 J1 C23 IC5 R63 R64 D2 R37 C6 R38 Q6 R36 X1 C17 D1 C16 J2 IC3 R28 R26 C13 R54 R27 R23 R22 R21 C21 C42 R31 1 30 SP SP BEEP BPLVL SQLV HVS NC 5V 5V DSCENC WXDEC RMUTE DSCDEC PTTC RCV PTT SEND KEYM TMUTE SQL TXDET SQLC H L BPF PSTB PCK PDATA UNLK GND GND J1 to the MAIN unit J1 1 4 NMEA NMEA ICF3 GND J2 9 3 ...

Page 29: ... BOTTOM VIEW DS4 DS5 DS7 DS6 DS2 DS3 9 4 ...

Page 30: ...J 1 R 1 1 5 HVS VOL1 VOL2 GND HV J1 to the MAIN unit W1 9 3 VR BOARD TOP VIEW BOTTOM VIEW 9 5 ...

Page 31: ...J 1 R 1 1 3 SQLI SQLV GND J1 to the MAIN unit W1 9 4 SQL BOARD TOP VIEW BOTTOM VIEW 9 6 ...

Page 32: ...9 7 R1 R3 R2 S2 S3 S4 R4 9 5 HM 141 TOP VIEW ...

Page 33: ...9 8 BOTTOM VIEW C1 S1 ...

Page 34: ... FI1 FI2 FL 363 Q2 3SK131 L Q1 3SK131 L Q4 2SC4215 O FI3 ALFY450E IC8 UPD3140GS PLL MOD IC1 M37560MFA 303GP CPU DS1 IS08251E00V0 Q2 2SB1132 R Q3 Q4 2SC4116 IC4 BR24L32FV W IC5 BD5242FVE TR IC2 PC357N6T IC3 TC7S14FU Q5 2SC4116 BL IC6 LA4425A IC2C NJM13403V IC2D NJM13403V IC2A NJM13403V IC3 NJM2211M Q13 Q14 2SC4226 R25 D11 D12 MA77 D13 D14 HVC350B Q15 2SC4215 O Q26 2SC4215 O Q16 2SC4215 O D16 17 MA7...

Page 35: ... 1 2 2 3 3 4 4 5 5 GND MIC MICG PSTB GND PCK PDATA UNLK SP RMUTE VCC GND BEEP OPC 1263 FRONT unit W3 SP BPLVL 5V 5V RCV SEND TMUTE TXDET DSCENC H L DSCDEC SQLC WXDEC BPF PTT SQL PTTC 5V SP SP BEEP 5V BPLVL VCC GND SQLV SQLI HV GND VOL2 VOL1 HVS SQLI GND SQLV VOL1 HVS HV GND VOL2 PTT MICG PTT GND MIC KEYM ICF3 NMEA NMEA KEYM KEYM GND RCV DSCENC WXDEC PTTC PCK KEYM RMUTE SEND H L BPF PDATA TMUTE DSC...

Page 36: ... 80 nH R85 220 C112 0 001 D14 HVC350B R81 1 k C115 47 P C114 0 001 R86 100 R82 1k C113 0 22 C117 470 k D12 MA77 R87 33 k D11 MA77 R88 22 k R89 100 k C111 10 Q12 DTC144EU C116 39 P D13 HVC350B R83 560 C121 0 01 MP1 1 2 3 4 5 6 C122 1 J1 30FLT SM1 TB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 C301 470 P C304 0 001 C305 0 001 C306 47 P H L SQLC TXDET BEEP BPLVL W...

Page 37: ...100 VL1 SEG14 SEG13 SEG12 SEG11 SEG10 SEG9 SEG8 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 R64 10 k S2 R62 10 k S3 R61 100 k S6 S7 S4 S5 C26 0 001 C31 24 P R63 10 k C32 22 P S1 SCAN CH WX CH16 DN UP DSC DTRS R65 1 M X1 CR 769 7 9872 MHz 26 P76 27 P75 28 P74 29 P73 30 P72 31 P71 32 P70 INT0 33 RESET 34 XCIN 35 XCOUT 36 XIN 37 XOUT 38 VSS 39 P27 40 P26 41 P25 42 P24 43 P23 44 P22 45 P21 46 P20 47 P17 48 P16...

Page 38: ...11 4 VR SQL BOARD R1 TP96N97N 15SK 10KA 2685 J1 S5B ZR 1 2 3 4 5 1 2 3 4 5 VOL1 VOL2 GND HV HVS VR BOARD R1 TP96N97 15SK 10KB 2685 J1 S3B ZR 1 2 3 GND SQLV SQLI SQL BOARD 11 4 ...

Page 39: ... 16 9 ON 3 8V 1 1 2 2 3 3 4 4 5 5 PTT MICG MIC GND KEYM CHASSIS UNIT W1 MC1 KUC3523 040245 C1 0 022 C2 470 P R1 12 k W3 W4 S1 SKHHLPA010 W2 W1 R2 6 8 k S4 SKHHLPA010 R3 15 k R4 33 k S2 SKHHLPA010 S3 SKHHLPA010 UP DOWN H L PTT MIC 11 5 ...

Page 40: ......

Page 41: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan S 14011IZ C1 2003 Icom Inc ...

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