Manuals
/
Icom
/
Communications
/
Two-Way Radio
Icom
IC-F21S service manual Uhf Fm Transceivers, Service Manual
Models:
IC-F21S
1
1
38
38
Download
38 pages
4.38 Kb
1
2
3
4
5
6
7
8
<
>
Specs
Install
Parts list
Voltage Diagram
Disassembly Instructions
Pll Adjustment
Drive/Power Amplifier Circuits
Service Manual
Accessories
Antenna Switching Circuit
Page 1
Image 1
SERVICE MANUAL
UHF FM TRANSCEIVERS
Page 2
Page 1
Image 1
Page 2
Contents
SERVICE MANUAL
UHF FM TRANSCEIVERS
DANGER
INTRODUCTION
ORDERING PARTS
REPAIR NOTES
TABLE OF CONTENTS
‘ GENERAL
SECTION 1 SPECIFICATIONS
‘ TRANSMITTER
‘ RECEIVER
MAIN UNIT TOP VIEW
SECTION 2 INSIDE VIEWS
BOTTOM VIEW
REMOVING THE CHASSIS
SECTION 3 DISASSEMBLY INSTRUCTIONS
REMOVING THE MAIN UNIT
4-1 RECEIVER CIRCUITS
SECTION 4 CIRCUIT DESCRIPTION
4-1-1 ANTENNA SWITCHING CIRCUIT
4-1-4 2ND IF AND DEMODULATOR CIRCUITS
4-2-3 DRIVE/POWER AMPLIFIER CIRCUITS
4-2 TRANSMITTER CIRCUITS
4-1-6 SQUELCH CIRCUIT
4-2-1 MICROPHONE AMPLIFIER CIRCUIT
4-3-1 GENERAL
4-3 PLL CIRCUIT
4-3-2 TX LOOP
4-3-3 RX LOOP
4-4 POWER SUPPLY CIRCUITS VOLTAGE LINE
4-5 PORT ALLOCATIONS
4-5-1 CPU IC7
LINE
4-5-2 OUTPUT EXPANDER IC IC15
CPU IC7-continued
4-5-3 D/A CONVERTOR IC IC9
Port
5-1 PREPARATION
SECTION 5 ADJUSTMENT PROCEDURES
STARTING SOFTWARE ADJUSTMENT
ADJUSTMENT SOFTWARE INSTALLATION
Screen display exampe
RF Power High
JIG cable
CH No
Connection
DC power cable connections
OPC-478
ADJUSTMENT
5-2 PLL ADJUSTMENT
ADJUSTMENT CONDITIONS
ADJUSTMENT
ADJUSTMENT
5-3 SOFTWARE ADJUSTMENT
ADJUSTMENT CONDITION
MEASUREMENT
ADJUSTMENT
SOFTWARE ADJUSTMENT - continued
ADJUSTMENT CONDITION
MEASUREMENT
SECTION
PARTS LIST
SW-A UNIT F21 only
UNIT F21S only
MAIN UNIT
MAIN UNIT
ORDER
DESCRIPTION
MAIN UNIT
MAIN UNIT
ORDER
DESCRIPTION
MAIN UNIT
MAIN UNIT
ORDER
DESCRIPTION
ORDER
MAIN UNIT
DESCRIPTION
ACCESSORIES
SECTION 7 MECHANICAL PARTS AND DISASSEMBLY
CHASSIS PARTS
MAIN UNIT
UNIT abbreviation C CHASSIS PARTS, M MAIN UNIT
IC-F21S
TRANSISTOR AND FET’S
SECTION 8 SEMI-CONDUCTOR INFORMATION
DIODES
9-1 MAIN UNIT
SECTION 9 BOARD LAYOUTS
B5601C
TOP VIEW
IC11
BOTTOM VIEW
B5603C
9-2 SW-A AND SW-B UNITS
TOP VIEW SW-A UNIT
SW-B UNIT
BOTTOM VIEW SW-A UNIT
B5604C
to the MAIN unit J1
SW-B UNIT
10-2 DISASSEMBLY INFORMATION
10-1 PARTS LIST
SECTION 10 BC-146 OPTIONAL DESKTOP CHARGER INFORMATION
CHARGE UNIT
MP1 MP2
10-3 VOLTAGE DIAGRAM
B5650
10-4 BOARD LAYOUT
MAIN UNIT
SECTION 11 BLOCK DIAGRAM
SW-A/SW-B UNIT S1
EXT.MIC
12-1 MAIN UNIT
SECTION 12 VOLTAGE DIAGRAM
SDEC
SECTION
VOLTAGE DIAGRAM
12-1 MAIN UNIT
12-2 SW-A AND SW-B UNITS
CHASSIS UNIT
SW-A UNIT
SW-B UNIT
Page
S-13717IZ-C1
1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan
2001 Icom Inc
