Icom IC-F21S service manual Voltage Diagram, Board Layout

Page 31

10-3 VOLTAGE DIAGRAM

J1

HEC0470-01-230

C : 13.8V		C : 7.2V
N : 13.8V		N : 13.8V
	R1 68	MP1
R2	DS1
1k	TLG124A

C : 9.2V

N : 13.8V

MP2

10-4 BOARD LAYOUT

J1

MP1

MP2

HD1

R2

DS1

R1

B5650

10 - 2

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Contents UHF FM Transceivers Ordering Parts IntroductionRepair Notes Table of Contents ‘ Receiver Specifications‘ General ‘ TransmitterMain Unit TOP View Inside ViewsBottom View Removing the Chassis Disassembly InstructionsRemoving the Main Unit Receiver Circuits Circuit DescriptionTransmitter Circuits PLL Circuit PLL CircuitGeneral VCO CircuitPort Allocations Power Supply Circuits Voltage LinePin Port Description Number 3 D/A Convertor IC IC9 Output Expander IC IC15Preparation Adjustment ProceduresGND Screen display exampeJIG cable SPEDC Power Supply GND DC power cable connectionsConnection Voltage PLL AdjustmentPLL Lock MainSoftware Adjustment SQL SensitivitySquelch LevelUnit Section Parts ListMain Unit Coil Eljfc R68M-F Array Electrolytic ECEV1CA470SP Connector Screw abbreviations B0, BT Self-tapping Mechanical Parts and DisassemblyAccessories Chassis PartsIC-F21S Transistor and FET’S SEMI-CONDUCTOR InformationDiodes Main Unit Board LayoutsIC6 FT1TOP 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 Charge Unit Parts ListDisassembly Information BC-146 Optional Desktop Charger InformationBoard Layout Voltage DiagramSW-A/SW-B Unit S1 Block Diagram2SC4215 O Voltage DiagramDTC144EU Section Voltage Diagram Q1 XP4216 SW-A UnitPage 32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan