Icom IC-F21S service manual Disassembly Instructions, Removing the Chassis, Removing the Main Unit

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SECTION 3 DISASSEMBLY INSTRUCTIONS

• REMOVING THE CHASSIS

¡Unscrew 1 nut, A, and remove 2 knobs, B, C. ™ Unscrew 2 screws, D.

£ Unscrew 2 screws, H, to separate the Jack panel and the Front panel.

¢Take off the chassis in the direction of the arrow.

∞ Unplug J6 to separate the front panel and the chassis.	D (Black, 2mm) x 2
∞ Unplug J6 to separate the front panel and the chassis.
	Chassis

C

B

J6 (Speaker connector)

A

Jack panel

Front panel

H(Black, 2mm) x 2

•REMOVING THE MAIN UNIT

¡ Remove the sealing rubber.

™ Unsolder 2 points, E, and unscrew 2 nuts, F.

£ Unscrew 8 screws, G, (silver, 2mm) to separate the chassis and the MAIN unit. ¢ Take off the MAIN unit in the direction of the arrow.

G ([F21S] only)

G

E

F

Sealing rubber

G

Side plate

G

Chassis

MAIN unit

Guide holes

3 - 1

Image 6

Contents UHF FM Transceivers Introduction Ordering PartsRepair Notes Table of Contents ‘ Transmitter Specifications‘ General ‘ ReceiverInside Views Main Unit TOP ViewBottom View Disassembly Instructions Removing the ChassisRemoving the Main Unit Circuit Description Receiver CircuitsTransmitter Circuits VCO Circuit PLL CircuitGeneral PLL CircuitPower Supply Circuits Voltage Line Port AllocationsPin Port Description Number Output Expander IC IC15 3 D/A Convertor IC IC9Adjustment Procedures PreparationSPE Screen display exampeJIG cable GNDDC power cable connections DC Power Supply GNDConnection Main PLL AdjustmentPLL Lock VoltageSoftware Adjustment Level SensitivitySquelch SQLSection Parts List UnitMain Unit Coil Eljfc R68M-F Array Electrolytic ECEV1CA470SP Connector Chassis Parts Mechanical Parts and DisassemblyAccessories 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 BC-146 Optional Desktop Charger Information Parts ListDisassembly 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