MC401 | Icom IC-F51, IC-F50 manual

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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

Icom IC-F51, IC-F50 service manual MC401

Contents

VHF Transceiver Introduction Ordering PartsRepair Notes Table of Contents ‘ Transmitter Specifications‘ General ‘ Receiver Inside Views Main UnitFront Unit Removing the Front Unit Disassembly InstructionsRemoving the Chassis Unit Removing the Main Unit RF Circuit Main Unit Antenna Switching Circuit Main UnitReceiver Circuits 3 1ST Mixer and 1ST if Circuits Main Unit Receive Mute Circuits Main and Front Units Transmitter CircuitsAF Amplifier Circuit Main and Front Units Microphone Amplifier Circuit Front and Main Units Modulation Circuit Main Unit DRIVE/POWER Amplifier CircuitsPLL Circuits APC Circuit Main Unit Main Unit Voltage Line Power Supply CircuitVCO Circuit Main Unit Front Unit Voltage Line Compounder Circuit Main Unit Other CircuitsPort Allocations Expander IC Front Unit IC410 Mdio SEG1SCK Msck 4 D/A Converter IC Main Unit IC6 Expander IC Main Unit IC12 Preparation Screen Display Example Adjustment Frequency ListFrequency Adjustment Item Ctcss Ptte PTT MIC Mice ConnectionJIG Cable SP+ Software Adjustments Transmitting Software Adjustments Receiving Convenient Connector Board VR BoardFront Unit Main Unit IC9 Varicap 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 Q23 Front Unit J402 MC401 VHF B6034B VR Board Connector Board MP701 Section Block Diagram CPU Voltage Diagram 2SC4116BL TC7W66FK 11-3 VR / Connector Boards VR Board Icom America Inc 32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan