Icom IC-F51, IC-F50 service manual MC401

Page 30

•BOTTOM VIEW

R434	C437
C426

DS406

R458

R457

		Q405			Q404
		Q406	R444	R442	Q403
R445		C484			R443
Q413		C433
Q413	R446	MC401

C485

DS405

DS404

C500

DS402

DS403

9 - 4

Image 30

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