Icom IC-F21S service manual Table of Contents

Page 3

TABLE OF CONTENTS

SECTION

1

SPECIFICATIONS

 

SECTION

2

INSIDE VIEWS

 

SECTION

3

DISASSEMBLY INSTRUCTIONS

 

SECTION

4

CIRCUIT DESCRIPTION

 

 

4-1

RECEIVER CIRCUITS

4-1

 

4-2

TRANSMITTER CIRCUITS

4-2

 

4-3

PLL CIRCUITS

4-3

 

4-4

POWER SUPPLY CIRCUITS

4-3

 

4-5

PORT ALLOCATIONS

4-4

SECTION

5

ADJUSTMENT PROCEDURES

 

 

5-1

PREPARATION

5-1

 

5-2

PLL ADJUSTMENT

5-4

 

5-3

SOFTWARE ADJUSTMENT

5-5

SECTION

6

PARTS LIST

 

SECTION

7

MECHANICAL PARTS AND DISASSEMBLY

 

SECTION

8

SEMI-CONDUCTOR INFORMATION

 

SECTION

9

BOARD LAYOUTS

 

 

9-1

MAIN UNIT

9-1

 

9-2

SW-A AND SW-B UNITS

9-3

SECTION

10

BC-146 OPTIONAL DESKTOP CHARGER INFORMATION

 

10-1 PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-1 10-2 DISASSEMBLY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-1 10-3 VOLTAGE DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-2 10-4 BOARD LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-2

SECTION 11 BLOCK DIAGRAM

SECTION 12 VOLTAGE DIAGRAM

12-1

MAIN UNIT

.12-1

12-2

SW-A AND SW-B UNITS

.12-2

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Contents UHF FM Transceivers Introduction Ordering PartsRepair Notes Table of Contents ‘ Receiver Specifications‘ General ‘ TransmitterInside Views Main Unit TOP ViewBottom View Disassembly Instructions Removing the ChassisRemoving the Main Unit Receiver Circuits Circuit DescriptionTransmitter Circuits PLL Circuit PLL CircuitGeneral VCO CircuitPower Supply Circuits Voltage Line Port AllocationsPin Port Description Number 3 D/A Convertor IC IC9 Output Expander IC IC15Preparation Adjustment ProceduresGND Screen display exampeJIG cable SPEDC power cable connections DC Power Supply GNDConnection Voltage PLL AdjustmentPLL Lock MainSoftware Adjustment SQL SensitivitySquelch LevelSection Parts List UnitMain Unit Coil Eljfc R68M-F Array Electrolytic ECEV1CA470SP Connector Screw abbreviations B0, BT Self-tapping Mechanical Parts and DisassemblyAccessories Chassis PartsIC-F21S SEMI-CONDUCTOR Information Transistor and FET’SDiodes Main Unit Board LayoutsIC6 FT1SW-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 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