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Icom
IC-F50, IC-F51
service manual
VHF Transceiver
Models:
IC-F51
IC-F50
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Specs
Section Block Diagram
Connector Board
Disassembly Instructions
Adjustment Frequency List
DRIVE/POWER Amplifier Circuits
Page 1
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SERVICE MANUAL
VHF TRANSCEIVER
Page 2
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Page 2
Contents
VHF Transceiver
Ordering Parts
Introduction
Repair Notes
Table of Contents
‘ General
Specifications
‘ Transmitter
‘ Receiver
Main Unit
Inside Views
Front Unit
Removing the Chassis Unit
Disassembly Instructions
Removing the Front Unit
Removing the Main Unit
Receiver Circuits
Antenna Switching Circuit Main Unit
RF Circuit Main Unit
3 1ST Mixer and 1ST if Circuits Main Unit
AF Amplifier Circuit Main and Front Units
Transmitter Circuits
Receive Mute Circuits Main and Front Units
Microphone Amplifier Circuit Front and Main Units
PLL Circuits
DRIVE/POWER Amplifier Circuits
Modulation Circuit Main Unit
APC Circuit Main Unit
VCO Circuit Main Unit
Power Supply Circuit
Main Unit Voltage Line
Front Unit Voltage Line
Port Allocations
Other Circuits
Compounder Circuit Main Unit
Expander IC Front Unit IC410
SCK
SEG1
Mdio
Msck
Expander IC Main Unit IC12
4 D/A Converter IC Main Unit IC6
Preparation
Frequency Adjustment Item
Adjustment Frequency List
Screen Display Example
Ctcss
JIG Cable
Connection
Ptte PTT MIC Mice
SP+
Software Adjustments Transmitting
Convenient
Software Adjustments Receiving
VR Board
Connector Board
Front Unit
IC9
Main Unit
Varicap HVC375BTRF
Themistor Ertjoep 473J
Ceramic ECJ0EC1H0R5B
Mechanical Parts and Disassembly
Unitmm inch
Transistor and FET’S
SEMI-CONDUCTOR Information
Diodes
Main Unit
Board Layouts
TOP View
Q23
Bottom View
J402
Front Unit
MC401
VR Board
VHF B6034B
MP701
Connector Board
CPU
Section Block Diagram
2SC4116BL
Voltage Diagram
TC7W66FK
11-3 VR / Connector Boards VR Board
Icom America Inc
32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan
