32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan | Icom IC-F21S

	S-13717IZ-C1
1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan	© 2001 Icom Inc.

Image 38

Icom IC-F21S service manual 32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan

Contents

UHF FM Transceivers Repair Notes IntroductionOrdering Parts Table of Contents ‘ Transmitter Specifications‘ General ‘ Receiver Bottom View Inside ViewsMain Unit TOP View Removing the Main Unit Disassembly InstructionsRemoving the Chassis Circuit Description Receiver Circuits Transmitter Circuits VCO Circuit PLL CircuitGeneral PLL Circuit Pin Port Description Number Power Supply Circuits Voltage LinePort Allocations Output Expander IC IC15 3 D/A Convertor IC IC9 Adjustment Procedures Preparation SPE Screen display exampeJIG cable GND Connection DC power cable connectionsDC Power Supply GND Main PLL AdjustmentPLL Lock Voltage Software Adjustment Level SensitivitySquelch SQL Main Unit Section Parts ListUnit Coil Eljfc R68M-F Array Electrolytic ECEV1CA470SP Connector Chassis Parts Mechanical Parts and DisassemblyAccessories Screw abbreviations B0, BT Self-tapping IC-F21S Diodes SEMI-CONDUCTOR InformationTransistor and FET’S Board Layouts Main Unit FT1 IC6 SW-B Unit SW-A and SW-B UnitsTOP View SW-A Unit GND Tled Rled VCC Volin Volout Bottom View SW-A UnitCBI0 CBI1 CBI2 CBI3 BC-146 Optional Desktop Charger Information Parts ListDisassembly 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