Bottom View SW-A Unit, CBI0 CBI1 CBI2 CBI3 | Icom IC-F21S guide

•BOTTOM VIEW SW-A UNIT

S1

	J1
		to the MAIN unit J1
		CBI0	CBI1	CBI2	CBI3

SW-B UNIT	1		4

R2

R3

R1

J2

to the MAIN unit J2

GND

TLED

RLED

VCC

VOLIN

VOLOUT

CBI0

17

S1
W1	W2	R2	R3	R1
W1	W2			R1

B5604C

J2

to the MAIN unit J2

GND

TLED

RLED

VCC

VOLIN

VOLOUT

CBI0

17

9 - 4

Image 29

Icom IC-F21S service manual Bottom View SW-A Unit, CBI0 CBI1 CBI2 CBI3, GND Tled Rled VCC Volin Volout

Contents

UHF FM Transceivers Repair Notes IntroductionOrdering Parts Table of Contents ‘ General Specifications‘ Transmitter ‘ Receiver Bottom View Inside ViewsMain Unit TOP View Removing the Main Unit Disassembly InstructionsRemoving the Chassis Receiver Circuits Circuit Description Transmitter Circuits General PLL CircuitVCO Circuit PLL Circuit Pin Port Description Number Power Supply Circuits Voltage LinePort Allocations 3 D/A Convertor IC IC9 Output Expander IC IC15 Preparation Adjustment Procedures JIG cable Screen display exampeSPE GND Connection DC power cable connectionsDC Power Supply GND PLL Lock PLL AdjustmentMain Voltage Software Adjustment Squelch SensitivityLevel SQL Main Unit Section Parts ListUnit Coil Eljfc R68M-F Array Electrolytic ECEV1CA470SP Connector Accessories Mechanical Parts and DisassemblyChassis Parts Screw abbreviations B0, BT Self-tapping IC-F21S Diodes SEMI-CONDUCTOR InformationTransistor and FET’S Main Unit Board Layouts IC6 FT1 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 Disassembly Information Parts ListBC-146 Optional Desktop Charger Information Charge Unit Board Layout Voltage Diagram SW-A/SW-B Unit S1 Block Diagram 2SC4215 O Voltage Diagram DTC144EU Section Voltage Diagram Q1 XP4216 SW-A UnitPage 32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan