Icom IC-M45 Service Manual Download Page 24

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C100

C102

C11

C178

C199

C182

C175

C200

C206

C190

C184

R157

C10

C99

R69

C97

R57

C87

R59

R58

C88

C12

R55

R46

R65

R141

C78

C86

R54

R15

C21

C74

R40

C73

R39

C72

R36

R18

R38

R20

C39

R23

R26

R27

C55

C43

C51

R44

R45

C50

R24

R37

R19

C38

C37

C35

C25

C34

R14

C33

C23

C26

R52

R31

C19

C18

C13

C15

C16

C14

C75

C46

C85

R53

C29

C17

R10

C24

C22

R16

C36

R17

C49

C41

R21

C45

C40

C42

R28

C54

C53

R25

C52

R139

C198

R153

C195

C166

C132

C134

R142

111

C129

C108

C107

C162

C180

C127

C128

R144

R102

R101

R108

R107

R103

R104

R123

C137

R122

R138

R124

R125

C183

C176

C174

C171

R135

C111

C112

C113

R152

R151

R149

R147

R146

C139

R119

R136

R115

C141

C130

C131

R134

C133

C173

R113

R117

R148

R150

R138

R82

R81

R84

R86

R87

C90

C95

C94

R56

R74

D14

D15

Q10

IC4

C165

R109

RED

BLK

IC2

• BOTTOM VIEW

Summary of Contents for IC-M45

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

Page 2: ...O NOT expose the transceiver to rain snow or any liquids DO NOT 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 i...

Page 3: ...ECTION 4 ADJUSTMENT PROCEDURES 4 1 PREPARATION 4 1 4 2 PLL ADJUSTMENTS 4 2 4 3 TRANSMITTER ADJUSTMENTS 4 2 4 4 RECEIVER ADJUSTMENT 4 2 SECTION 5 PARTS LIST SECTION 6 MECHANICAL PARTS AND DISASSEMBLY SECTION 7 SEMI CONDUCTOR INFORMATION SECTION 8 BOARD LAYOUTS 8 1 LOGIC VR A AND VR B UNITS 8 1 8 2 MAIN UNIT 8 3 SECTION 9 BLOCK DIAGRAM SECTION 10 VOLTAGE DIAGRAM 10 1 LOGIC UNIT 10 1 10 2 MAIN UNIT 1...

Page 4: ... emissions 70 dB Adjacent channel power 60 dB Residual modulation 40 dB Audio harmonic distortion Less than 10 at 70 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 30 85 MHz 2nd 450 kHz Sensitivity 0 22 µV typical at 12 dB SINAD Squelch sensitivity 0 22 µV typical Ad...

Page 5: ...7 200 157 250 157 300 157 350 157 400 156 025 156 075 156 075 156 125 156 125 156 175 156 175 156 225 156 225 156 275 156 275 156 325 156 325 156 375 156 425 156 475 156 525 156 575 156 625 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 15...

Page 6: ...he screw 10 12 kg of torque MUST be applied to ensure water resistance REMOVING THE MAIN UNIT 1 Unsolder DC cable 2 points and antenna connector B 3 points as shown below 2 Unscrew 2 screws C and 7 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 7: ...signals twice improves the image rejection ratio and obtains stable receiver gain The FM IF IC IC1 contains the 2nd local oscillator 2nd mixer limiter amplifier quadrature detector and noise detector circuits etc The 1st IF signal from Q3 is applied to the 2nd mixer section of IC1 pin 16 and is mixed with a 30 4 MHz 2nd LO signal generated at the PLL circuit by doubling the reference fre quency 15...

Page 8: ...ltered signals are then applied to the modulation circuit 3 2 2 MODULATION CIRCUIT The modulation circuit modulates the VCO oscillating signal RF signal using the microphone audio signals Audio signals from the splatter filter IC6b pass through the frequency deviation adjustment pot R130 and are then applied to the modulation circuit D7 to change the reac tance of D7 and modulate the oscillated si...

Page 9: ...then applied to the phase detector section The phase detector compares the input signal with a refer ence frequency and then outputs the out of phase signal pulse type signal from pin 13 The pulse type signal is converted into DC voltage lock voltage at the loop filter R34 R37 R38 C64 C73 and then applied to varactor diode D8 of the RX VCO to stabi lize the oscillated frequency The lockvoltage is ...

Page 10: ...cuit Main unit D11 D12 Input port for the squelch volume level Input port for the smart mic functions 2 02 V UP is pushed 3 00 V DN is pushed 3 84 V HI LO is pushed Outputs beep audio signals Outputs strobe signals for the output expander MAIN unit IC7 Outputs strobe signals for the PLL cir cuit Outputs data signals to the EEPROM IC4 PLL IC MAIN unit IC3 and expander ICs MAIN unit IC7 etc Outputs ...

Page 11: ...EQUIPMENT Audio generator Standard signal generator SSG Oscilloscope AC millivoltmeter External speaker Attenuator 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 or 50 d...

Page 12: ...ntenna con nector 2 6 V 2 8 V 156 8000 MHz MAIN MAIN L13 L12 C117 OUTPUT POWER FREQUENCY DEVIATION ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITION MEASUREMENT VALUE POINT UNIT LOCATION UNIT ADJUST 1 2 1 Operating channel ch16 Output power Low Transmitting Output power High Transmitting Operating channel ch16 Output power Low Connect an audio generator to J2 pin 5 with an AC millivoltmeter and set as Fr...

Page 13: ...ion adjustment L12 L13 PLL lock voltage adjustment for TX PLL lock voltage check point for RX PLL lock voltage check point for TX Sensitivity check point Sensitivity adjustment PLL lock voltage adjustment for RX Reference frequency adjustment PTT Output power adjustment for Low 1 7 Audio generator 300 Hz to 3 kHz AC millivoltmeter 2 200 mV w y t r ...

Page 14: ...7030003640 S RESISTOR ERJ3GEYJ 473 V 47 kΩ C1 4030006860 S CERAMIC C1608 JB 1H 102K T A C2 4030006860 S CERAMIC C1608 JB 1H 102K T A C3 4030006900 S CERAMIC C1608 JB 1E 103K T A C4 4030006900 S CERAMIC C1608 JB 1E 103K T A C5 4030006900 S CERAMIC C1608 JB 1E 103K T A C6 4030006900 S CERAMIC C1608 JB 1E 103K T A C7 4030009660 S CERAMIC C1608 JF 1C 224Z T A C8 4030006900 S CERAMIC C1608 JB 1E 103K T...

Page 15: ...V 560 Ω R18 7030003460 S RESISTOR ERJ3GEYJ 152 V 1 5 kΩ R19 7030003680 S RESISTOR ERJ3GEYJ 104 V 100 kΩ R20 7030003400 S RESISTOR ERJ3GEYJ 471 V 470 Ω R21 7030003460 S RESISTOR ERJ3GEYJ 152 V 1 5 kΩ R22 7030003390 S RESISTOR ERJ3GEYJ 391 V 390 Ω R23 7030003450 S RESISTOR ERJ3GEYJ 122 V 1 2 kΩ R24 7030003680 S RESISTOR ERJ3GEYJ 104 V 100 kΩ R25 7030003400 S RESISTOR ERJ3GEYJ 471 V 470 Ω R26 7030003...

Page 16: ...102K 500PT C9 4030011190 S CERAMIC GRM42 6 CH 270J 500PT C10 4030007010 S CERAMIC C1608 CH 1H 100D T A C11 4030011220 S CERAMIC GRM42 6 CH 360J 500PT C12 4030006970 S CERAMIC C1608 CH 1H 060D T A C13 4030009510 S CERAMIC C1608 CH 1H 010B T A C14 4030006860 S CERAMIC C1608 JB 1H 102K T A C15 4030006860 S CERAMIC C1608 JB 1H 102K T A C16 4030006860 S CERAMIC C1608 JB 1H 102K T A C17 4030006860 S CER...

Page 17: ...24R C153 4030008890 S CERAMIC C1608 JB 1C 273K T A C154 4030006870 S CERAMIC C1608 JB 1H 222K T A C155 4030009490 S CERAMIC C1608 JB 1H 821K T A C156 4510004630 S ELECTROLYTIC ECEV1CA100SR C157 4550006150 S TANTALUM ECST1CY105R C158 4030006860 S CERAMIC C1608 JB 1H 102K T A C159 4550006130 S TANTALUM ECST1VY224R C160 4550006170 S TANTALUM ECST1AY225R C161 4550006170 S TANTALUM ECST1AY225R C162 403...

Page 18: ...ORDER NO DESCRIPTION QTY CHASSIS PARTS REF NO ORDER NO DESCRIPTION QTY LOGIC UNIT R1 7210001500 Variable resistor RK097111102AA 10KA 1 PWR VOL incl nut REF NO ORDER NO DESCRIPTION QTY VR A UNIT R1 7210001010 Variable resistor RK097111000AA 10KB 1 SQUELCH incl nut REF NO ORDER NO DESCRIPTION QTY VR B UNIT MAIN UNIT MP1 8510011600 2040 VCO Case 1 MP2 8510011590 2040 VCO Cover 1 MP3 8510011690 2040 M...

Page 19: ...MP2 L DS3 L DS2 L VR B UNIT DS1 L MP1 L MP21 C MP16 C MP16 C MP3 M MP16 C MP18 C W3 L IC2 M MP12 C MP3 C MP7 C J1 C W1 C MP19 C MP2 C MP13 C MP21 C MAIN UNIT MP21 C 6 2 UNIT abbreviation C CHASSIS PARTS L LOGIC UNIT M MAIN UNIT VA VR A UNIT VB VR B UNIT Note Refer to IC M59 service manual for HM 117 microphone details ...

Page 20: ...ol LG 2SC2712 Y Symbol LY 2SC2714 Y Symbol QY 2SC2954 Symbol QK 2SC3775 3 Symbol OY3 2SC4215 O Symbol QO 2SD1664 Q Symbol DA 2SK210 GR Symbol YG 2SK880 Y Symbol XY 2SK882 Y Symbol TY 3SK131 L Symbol V12 FMW1 Symbol W1 RN1402 Symbol XB RN1404 Symbol XD XP6501 AB Symbol 5N DIODES 1SS196 Symbol G3 1SS226 Symbol C3 1SS272 Symbol A1 1SS321 Symbol F9 HSM88ASR Symbol C3 MA862 Symbol M1I RD6 2M B2 Symbol ...

Page 21: ...C15 R25 R22 C16 R30 C14 C4 C3 C13 R3 R27 C11 R28 C12 R19 R18 Q4 C10 IC1 X1 J1 1 1 D4 IC4 J2 IC2 Q3 D3 IC3 Q2 D1 Q1 D2 SP SP SP SP GND BEEP PTT ICF3 HANG TXDET OEX OE P STB OEX STB TONE S METER SQL PTT S UNLK CK DATA DATAM DATAS SQLV BUSY GND GND F MODE HVS NC 5V 1 30 J1 TO MAIN UNIT J4 KEY M GND J2 1 2 FROM MICROPHONE R1 1 HV GND VOL2 VOL1 HVS 1 5 J2 TO MAIN UNIT J1 J1 1 R1 SQLG SQLV SQLI 1 3 J1 T...

Page 22: ...8 2 8 1 2 BOTTOM VIEW LOGIC UNIT VR B UNIT VR A UNIT ...

Page 23: ...R51 R32 C67 C120 C122 C124 C115 C187 C106 R155 C110 C114 R89 R88 R75 R76 R73 R72 R68 R48 R66 C149 R100 C155 C177 C186 C189 C192 C207 R156 L23 R34 C65 C76 C63 R42 C81 R67 C80 R49 R50 C83 C20 R13 L8 C30 R12 C32 C31 L18 R47 R35 R78 C89 R64 R60 R61 R62 C91 C92 C93 R63 C68 C121 C205 C202 L24 C123 C154 C179 R145 C153 R154 R83 R99 R98 R96 R93 R94 R95 R97 R92 R126 C194 R133 R132 R131 C148 IC9 R140 C185 C2...

Page 24: ...14 Q1 D2 D9 D3 D4 Q6 C75 C46 Q3 D5 Q2 C85 R53 C29 C17 R5 R8 R10 R11 R9 C24 R6 C22 R16 C36 R17 C49 C41 R21 C45 C40 C42 R28 C54 C53 R25 C52 R139 C198 R153 C195 C166 R116 C132 C134 R142 R111 R112 C129 C108 C107 C162 C180 C127 C128 R144 R102 R101 R108 R107 R103 R104 R123 C137 R122 R138 R124 R125 C119 C118 C116 C183 C176 C174 C171 R135 C111 C112 C113 R152 R151 R149 R147 R146 C139 R119 R136 R115 C141 C1...

Page 25: ...8V EXPAND REVERSE CONECT PROTECT POWER SW VR A unit HVS REG R5 CTRL RCV T5 CTRL SEND LOOP FIL VCO Q7 2SC4215 O Q9 2SC4215 O LPF T5 MIC AMP IDC AMP R5 5V HV LAMP DS2 HRS 7219A Y2 30 DS3 HRS 7219A Y2 30 MIC CERAMIC BPF BUFF BUFF IF AMP XTAL BPF FIL BPF RF AMP PRE DRIVE YGR AMP BPF LPF RF OUT DET APC HI LOW CTRL HI LO ANT BUFF RX LINE TX LINE LINE DATA BUS LINE Q4 FMW1 Q5 2SB1132 Q IC2 S 80742SL A6 I...

Page 26: ...22 23 24 25 26 27 28 29 30 J1 to MAIN unit J4 W3 OPC 519 SP SP C2 0 001 C1 0 001 SP1 F45GO7 4 W1 W2 4 5 1 2 3 IC2 S 80742SL A6 R9 100 k R7 220 k D1 1SS196 R6 470 k C7 0 22 R5 1 k R4 100 k C6 0 01 Q1 2SC2712 GR R8 220 k IC1 M38223M4 432 HP SEG9 61 VL1 80 SEG8 62 SEG7 63 SEG6 64 SEG5 65 SEG4 66 SEG3 67 SEG2 68 SEG1 69 SEG0 70 VCC 71 VREF 72 AVSS 73 COM3 74 COM2 75 COM1 76 COM0 77 VL3 78 VL2 79 C12 0...

Page 27: ...1 R156 100 5V R44 330 C113 0 01 DSC DSC C HI LO C112 0 001 C111 0 022 Q15 RN1404 C110 0 1 R75 3 3 k R74 2 2 k R76 10 k R73 220 R72 10 k Q16 RN1402 R69 1 5 k R68 100 k C104 0 001 C105 0 1 C177 0 01 R70 10 k R71 470 SP ICF3 SP AF2 J3 HSJ1493 01 010 J2 B07B EH S C128 0 001 C127 0 001 C130 0 001 C129 0 001 AF1 PTT HANG GND MIC GND AF2 R134 100 R113 270 k HANG TXDET PTT C134 0 0056 R112 1 k C135 0 047 ...

Page 28: ...VR B UNIT VR A UNIT W1 1 2 3 4 5 6 7 8 P1 HV GND VOL2 VOL1 HVS SQLV SQLI SQLG SQLG SQLI SQLV HV HVS GND VOL2 VOL1 1 2 3 J1 1 2 3 4 5 J2 R1 10 k R1 10 k to MAIN unit J1 10 3 10 3 VR A AND VR B UNITS ...

Page 29: ...com france com Crta de Gracia a Manresa Km 14 750 08190 Sant Cugat del Valles Barcelona SPAIN Phone 93 590 26 70 Fax 93 589 04 46 URL http www icomspain com Corporate Headquarters 2380 116th Avenue N E Bellevue WA 98004 U S A Phone 425 454 8155 Fax 425 454 1509 URL http www icomamerica com Customer Service Phone 425 454 7619 A C N 006 092 575 290 294 Albert Street Brunswick Victoria 3056 Australia...

Page 30: ...6 9 16 Kamihigashi Hirano ku Osaka 547 0002 Japan S 13611IZ CD 2000 Icom Inc ...

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