SW-A and SW-B Units, TOP View SW-A Unit | Icom IC-F21S specs

9-2 SW-A AND SW-B UNITS

•TOP VIEW SW-A UNIT

F1	DS1
Q1

SW-B UNIT

B5603C

F1

Q1

DS1

9 - 3

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Icom IC-F21S service manual SW-A and SW-B Units, TOP View SW-A Unit

Contents

UHF FM Transceivers Ordering Parts IntroductionRepair Notes Table of Contents Specifications ‘ General‘ Transmitter ‘ Receiver Main Unit TOP View Inside ViewsBottom View Removing the Chassis Disassembly InstructionsRemoving the Main Unit Circuit Description Receiver Circuits Transmitter Circuits PLL Circuit GeneralVCO Circuit PLL Circuit Port Allocations Power Supply Circuits Voltage LinePin Port Description Number Output Expander IC IC15 3 D/A Convertor IC IC9 Adjustment Procedures Preparation Screen display exampe JIG cableSPE GND DC Power Supply GND DC power cable connectionsConnection PLL Adjustment PLL LockMain Voltage Software Adjustment Sensitivity SquelchLevel SQL Unit Section Parts ListMain Unit Coil Eljfc R68M-F Array Electrolytic ECEV1CA470SP Connector Mechanical Parts and Disassembly AccessoriesChassis Parts Screw abbreviations B0, BT Self-tapping IC-F21S Transistor and FET’S SEMI-CONDUCTOR InformationDiodes Board Layouts Main Unit FT1 IC6 TOP View SW-A Unit SW-A and SW-B UnitsSW-B Unit CBI0 CBI1 CBI2 CBI3 Bottom View SW-A UnitGND Tled Rled VCC Volin Volout Parts List Disassembly InformationBC-146 Optional Desktop Charger Information Charge Unit Voltage Diagram Board Layout Block Diagram SW-A/SW-B Unit S1 Voltage Diagram 2SC4215 O DTC144EU Section Voltage Diagram SW-A Unit Q1 XP4216Page 32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan