Icom IC-F21S service manual

Page 24

MP21 (C)

MP18 (C)

MP19 (C)

MP33 (C)

MP1 (C)

MP6 (M)

MP26 (C)

MP4 (C)
MP6 (C)	SP1 (C)
	SP1 (C)
	MP29 (C)

MP30 (C)

MP11 (C)

MP20 (C)

MP7 (C)

MP27 (C)

MP14 (C)

MP13 (C)

MP39 (C)

MP35 (C)([F21S] only)

MP29 (C)

MP7(M)

MP29 (C)	MP28 (C)
MP29 (C)	MP15 (C)
	MP10 (C)
MAIN unit

MP1 (M)

MP2 (M)

MP29 (C)

MP29 (C)

MP34 (C)

MP32 (C)

MP8 (C)

MP29 (C)

MP29 (C)

MP12 (C)

MP9 (C)

MP22 (C)

IC-F21S

UNIT abbreviation (C): CHASSIS PARTS, (M): MAIN UNIT

7 - 2

Image 24

Contents UHF FM Transceivers Introduction Ordering PartsRepair Notes Table of Contents Specifications ‘ General‘ Transmitter ‘ ReceiverInside Views Main Unit TOP ViewBottom View Disassembly Instructions Removing the ChassisRemoving the Main Unit Circuit Description Receiver CircuitsTransmitter Circuits PLL Circuit GeneralVCO Circuit PLL CircuitPower Supply Circuits Voltage Line Port AllocationsPin Port Description Number Output Expander IC IC15 3 D/A Convertor IC IC9Adjustment Procedures PreparationScreen display exampe JIG cableSPE GNDDC power cable connections DC Power Supply GNDConnection PLL Adjustment PLL LockMain VoltageSoftware Adjustment Sensitivity SquelchLevel SQLSection Parts List UnitMain Unit Coil Eljfc R68M-F Array Electrolytic ECEV1CA470SP Connector Mechanical Parts and Disassembly AccessoriesChassis Parts Screw abbreviations B0, BT Self-tappingIC-F21S SEMI-CONDUCTOR Information Transistor and FET’SDiodes Board Layouts Main UnitFT1 IC6SW-A and SW-B Units TOP View SW-A UnitSW-B Unit Bottom View SW-A Unit CBI0 CBI1 CBI2 CBI3GND Tled Rled VCC Volin Volout Parts List Disassembly InformationBC-146 Optional Desktop Charger Information Charge UnitVoltage Diagram Board LayoutBlock Diagram SW-A/SW-B Unit S1Voltage Diagram 2SC4215 ODTC144EU Section Voltage Diagram SW-A Unit Q1 XP4216Page 32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan