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TABLE OF CONTENTS

SECTION

1

SPECIFICATIONS

SECTION

2

INSIDE VIEWS

SECTION

3

DISASSEMBLY AND OPTION INSTRUCTIONS

3-1

DISASSEMBLY INSTRUCTION  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1

3-2

OPTIONAL UNIT INSTALLATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

SECTION

4

CIRCUIT DESCRIPTION

4-1

RECEIVER CIRCUITS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1

4-2

TRANSMITTER CIRCUITS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1

4-3

PLL CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2

4-4

POWER SUPPLY CIRCUITS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3

4-5 

CPU 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

SECTION

10

BC-137 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

Summary of Contents for IC-F4GS

Page 1: ...SERVICE MANUAL UHF FM TRANSCEIVERS ...

Page 2: ... F4GT MAIN UNIT 1 pieces 8810009510 Screw BT M2 x 4 NI ZU IC F4GS Chassis 10 pieces Addresses are provided on the inside back cover for your convenience 1 Make sure a problem is internal before disassembling the transceiver 2 DO NOT open the transceiver until the transceiver is disconnected from its power source 3 DO NOT force any of the variable components Turn them slowly and smoothly 4 DO NOT s...

Page 3: ...OWER SUPPLY CIRCUITS 4 3 4 5 CPU 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 SECTION 10 BC 137 OPTIONAL DESKTOP CHARGER INFORMATION 10 1 PARTS LIST 10 1 10 2 DISASSEMBLY INFORMATION 10 1 10 3 VOL...

Page 4: ... Maximum frequency deviation 2 5 kHz Spurious emissions 73 dBc typical Adjacent channel power 60 dB typical Transmitter audio distortion Less than 3 at 1 kHz 40 deviation Limitting charact of modulator 70 100 of max deviation Ext microphone connector 3 conductor 2 5 d mm 1 10 2 2 kΩ RECEIVER Receive system Double conversion superheterodyne system Intermediate frequencies 1st 46 35 MHz 2nd 450 kHz ...

Page 5: ...7030000500 S RESISTOR MCR10EZHJ 10 kΩ 1 R6 7030000190 S RESISTOR MCR10EZHJ 27 Ω 270 1 R7 7030001740 S RESISTOR MCR10EZHJ 2 kΩ 1 R8 7030001740 S RESISTOR MCR10EZHJ 2 kΩ 1 R9 7030000590 S RESISTOR MCR10EZHJ 56 kΩ 1 R10 7030000500 S RESISTOR MCR10EZHJ 10 kΩ 1 R11 7030000380 S RESISTOR MCR10EZHJ 1 kΩ 1 C1 4030001150 S CERAMIC GRM40 F 104Z 25PT 1 C2 4030001150 S CERAMIC GRM40 F 104Z 25PT 1 C3 403000115...

Page 6: ...6 9 16 Kamihigashi Hirano ku Osaka 547 0002 Japan S 13610IZ CD 2000 Icom Inc ...

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