Icom IC-F51, IC-F50 Disassembly Instructions, Removing the Chassis Unit, Removing the Front Unit

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SECTION 3 DISASSEMBLY INSTRUCTIONS

REMOVING THE CHASSIS UNIT

1Unscrew 1 nut A, and remove 1 knob B.

2Remove 1 washer c, and unscrew 1 screw D.

3 Unscrew 2 screws E, and remove 2 washers F.

4 Unscrew 2 screws G.

5 Take off the chassis unit in the direction of the arrow. 6 Remove the cable H from the chassis unit.

Chassis unit

B CD G

A

F

E H

REMOVING THE FRONT UNIT

1Unscrew 4 screws M.

2 Unsolder 11 points N.

3 Unplug the connector O from J402 on the Front unit. 4 Take off the front unit in the direction of the arrow.

M

N

Front unit

N

O

EF

REMOVING THE MAIN UNIT

1Unscrew 2 screws I.

2Unsolder 5 points J, and remove the shield cover.

3 Unscrew 5 screws K.

4 Unsolder 5 points L, and take off the main unit in the direction of the arrow.

 

 

I J

 

 

Shield cover

 

K

I

 

 

L

L

K

 

 

J

 

 

Main unit

Chassis unit

3 - 1

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Contents VHF Transceiver Introduction Ordering PartsRepair Notes Table of Contents ‘ Transmitter Specifications‘ General ‘ ReceiverInside Views Main UnitFront Unit Removing the Front Unit Disassembly InstructionsRemoving the Chassis Unit Removing the Main UnitRF Circuit Main Unit Antenna Switching Circuit Main UnitReceiver Circuits 3 1ST Mixer and 1ST if Circuits Main UnitReceive Mute Circuits Main and Front Units Transmitter CircuitsAF Amplifier Circuit Main and Front Units Microphone Amplifier Circuit Front and Main UnitsModulation Circuit Main Unit DRIVE/POWER Amplifier CircuitsPLL Circuits APC Circuit Main UnitMain Unit Voltage Line Power Supply CircuitVCO Circuit Main Unit Front Unit Voltage LineCompounder Circuit Main Unit Other CircuitsPort Allocations Expander IC Front Unit IC410Mdio SEG1SCK Msck4 D/A Converter IC Main Unit IC6 Expander IC Main Unit IC12Preparation Screen Display Example Adjustment Frequency ListFrequency Adjustment Item CtcssPtte PTT MIC Mice ConnectionJIG Cable SP+Software Adjustments Transmitting Software Adjustments Receiving ConvenientConnector Board VR BoardFront Unit Main Unit IC9Varicap HVC375BTRF Themistor Ertjoep 473J Ceramic ECJ0EC1H0R5B Mechanical Parts and Disassembly Unitmm inch SEMI-CONDUCTOR Information Transistor and FET’SDiodes Board Layouts Main UnitTOP 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