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Icom Manuals
Transceiver
IC-551
Maintenance manual
Icom IC-551 Maintenance Manual
50mhz all mode transceiver
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Also See for IC-551
:
Instruction manual
(59 pages)
,
Instruction manual
(60 pages)
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Table Of Contents
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Specifications
Operating Controls
Front Panel
Rear Panel
Controls under the Access Cover
Front Panel Parts List
Product View
Rear Panel Parts List
Circuit Description
Receiver Circuits
Antenna Switching Circuit
RF Circuit/If Circuit/Pass Band Tuning Circuit
SSB, SW, am Detector Circuit
BFO Circuit
AF Circuit
Transmitter Circuits
Noise Blanker Circuit
Transmit if Amplifier Circuit
Transmit Mixer Circuit
Power Amplifier Circuit
Low-Pass Filter Circuit
APC/ALC Circuit
VOX Circuit
CW Monitor Circuit
Metering Circuit
Squelch Stop Circuit
Power Supply Circuit
PLL (Phase Locked Loop) Unit
Local Oscillator Circuit
Programmable Divider Circuit
Phase Detector and Loop Filter Circuit
Driver Unit
Power Circuit
VCO Unit
Lock Failure Detector and Mute Control Circuit
CPU Control Circuit
Frequency Control, Display and I/O Circuit
CPU Malfunction-Prevent Circuit
D/A (Digital to Analog) Converter Circuit
RIT Control Circuit
Scan Clock Generator and Control Circuit
Scan Start/Stop Control Circuit
In the Scan "A" Mode
Scan Start
Scan Start/Stop Circuit
Scan Start/Stop Timing Chart
Scan Stop
In the Scan "B" Mode
Memory Write
Auto Scan Start
AC Power Supply Unit
PI Unit
SW REG (Switching Regulator) Unit
Block Diagram
Inside Views
Options Installation
Front Panel Disassembly
Maintenance and Adjustment
Measuring Instruments Required for Adjustment
PLL Adjustment
Local Oscillator Level Adjustment
Reference Frequency Adjustment
VXO Frequency Adjustment
Receiver Adjustment
FR Band-Pass Filter Adjustment
AGC Threashold Adjustment
IF Circuit Adjustment
S-Meter Adjustment
Noise Blanker Adjustment
SSB Squelch Adjustment
RIT Frequency Adjustment
Transmitter Adjustment
BFO Frequency Adjustment
Idling Current Adjustmen
Band-Pass Filter Adjustment
RF Power Amplifier Adjustment
Carrier Suppression Adjustment
ALC (RF Power) Adjustment
RF Meter Adjustment
MIC Gain (Modulation) Adjustment
Printed Circuit Boards
Schematic Diagrams
Voltage Chart
R Output Timing Chart
Troubleshooting
Display Fails to Illuminate. Abnormal Figure Is Displayed
Display Does Not Charge
The Set Does Not Work with AC Power Source
No Output Power
No Receive and Transmit
No Receive
IC Specifications
Parts List
Schematic Diagram
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Instruction Manual
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