Icom IC-F51, IC-F50 service manual Bottom View, Q23

Page 28

BOTTOM VIEW

C292

R165

L20

Q23

Q24

 

C3

R51

C1

 

 

C302

C13

 

 

L1

 

 

L4

L16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C2

 

 

 

 

C11

 

 

 

 

 

 

 

 

 

 

 

 

C8

 

C10

 

 

 

 

L2

 

 

 

 

 

 

 

C4

 

 

 

 

 

 

 

C5

C7

 

L3

 

 

 

 

 

C6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C14

D2

 

R1

C9

 

 

 

 

 

 

 

 

 

 

D5

L5

L6

L15

C308

 

 

 

 

 

 

 

C101

D1

 

 

 

 

 

 

C16

 

 

C15

C291

 

 

 

 

 

 

 

 

L7

 

R52

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C24

 

 

C72

 

 

 

 

 

 

 

 

 

 

 

 

C31

 

 

 

C74

 

D15

 

L8

C184

 

 

 

 

 

 

R18

 

 

 

 

 

 

 

 

 

 

 

 

C35

R24

C182

 

R17

 

L17

C82

C99

R68

R69

D14

 

R166

C234

C233

MP1

C95L19

R63

 

R67

Q9

C93

R65

 

Q25

C235

C97

C96

R62

C90

C239 C238

C108

Q21

C231

R161

R162

Q29

IC7

C305

 

 

 

R50

 

 

L9

C36

 

C183

 

 

 

 

 

MP2

MP5

R28

R26

 

C135

R27

 

 

C49

 

L12

 

 

 

 

 

 

 

L11

C41

Q3

C48

C50

R29

 

 

 

 

C44

R25

 

 

 

 

 

 

 

 

 

C55

R32

C51

C52

L13

 

 

 

 

C53

C54

 

R31

 

Q10

R72

C102

L22

 

 

 

 

Q17

 

 

 

 

R78

Q12

 

 

 

R169

 

 

 

 

 

 

 

 

 

 

C120

 

Q13

C122

 

 

 

 

 

 

 

D12

R170

 

 

C118

 

 

C113

R85

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C119

D17

R83

R84C121

C115

 

Q14

C114

 

R98

C137

 

C195

C116

 

R81

 

 

 

 

 

 

R82

 

C117

 

 

R79

 

 

 

 

D16

C193

C124

L24

C123

L19

L20

L37

 

C126

C148

 

 

 

 

C192

 

 

 

 

C190

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C194

 

 

 

 

C191

 

 

 

 

 

 

 

L25

 

 

C127

 

 

 

 

 

 

 

 

L39

 

 

 

 

 

 

 

L38

 

D21

C129

 

 

D22

L26

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C133

 

 

 

 

C134

 

C242

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FI1

 

C57

C56

 

 

R90

C240

R91

 

C132

 

C149

R97

C209

D24

C151

C152

R117

 

 

 

 

C153

R118

 

R93

R94

C155

 

 

 

 

Q22

R163

R164

C232

R33

 

C58

R34

 

Q4

R48

R38R35

 

 

R92

 

 

C227

 

C166

C164

C60

C267

 

 

 

C59

 

 

 

R129

C167

 

 

 

C162

C154

 

 

C165

 

 

 

 

C163

 

L35

R115

 

 

Q19

L33

 

R116

 

 

R130

C269

C262

 

C261

 

IC4

C140

EP6

 

C156

C157

 

 

R132

C161

R191

R108

R131

C260

C248

C249

 

X2

 

 

 

R190

 

C158

C287

C159

EP3

IC15

C288

Q27

 

C279

R145

 

R144

X3

R102

C61

C63

C66

R119

C228

 

C65

 

C188

C62

 

 

C250

C274

C289

C211

R43

C255

R125

X4

C280

C273

 

 

IC1

 

 

R39

 

 

C67

R40

 

C71

 

 

C169

 

C168

 

C68

R42R45

C69 R46

R44C70

C75

C199

C264

 

C259

 

 

 

 

R180

C220

C226

C294

R139

R186

 

C277

IC14

C276

 

C275

9 - 2

Image 28
Contents VHF Transceiver Ordering Parts IntroductionRepair Notes Table of Contents Specifications ‘ General‘ Transmitter ‘ ReceiverMain Unit Inside ViewsFront Unit Disassembly Instructions Removing the Chassis UnitRemoving the Front Unit Removing the Main UnitAntenna Switching Circuit Main Unit Receiver CircuitsRF Circuit Main Unit 3 1ST Mixer and 1ST if Circuits Main UnitTransmitter Circuits AF Amplifier Circuit Main and Front UnitsReceive Mute Circuits Main and Front Units Microphone Amplifier Circuit Front and Main UnitsDRIVE/POWER Amplifier Circuits PLL CircuitsModulation Circuit Main Unit APC Circuit Main UnitPower Supply Circuit VCO Circuit Main UnitMain Unit Voltage Line Front Unit Voltage LineOther Circuits Port AllocationsCompounder Circuit Main Unit Expander IC Front Unit IC410SEG1 SCKMdio Msck4 D/A Converter IC Main Unit IC6 Expander IC Main Unit IC12Preparation Adjustment Frequency List Frequency Adjustment ItemScreen Display Example CtcssConnection JIG CablePtte PTT MIC Mice SP+Software Adjustments Transmitting Software Adjustments Receiving ConvenientVR Board Connector BoardFront Unit Main Unit IC9Varicap HVC375BTRF Themistor Ertjoep 473J Ceramic ECJ0EC1H0R5B Mechanical Parts and Disassembly Unitmm inch Transistor and FET’S SEMI-CONDUCTOR InformationDiodes Main Unit Board LayoutsTOP View Bottom View Q23Front Unit J402MC401 VHF B6034B VR BoardConnector Board MP701Section Block Diagram CPUVoltage Diagram 2SC4116BLTC7W66FK 11-3 VR / Connector Boards VR Board Icom America Inc 32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan