Home
Icom
Transceiver
IC-551
Icom IC-551 Maintenance Manual
90 pages
Manual
Specs
Ask a question
To Next Page
To Next Page
Loading...
2
Table of Contents
Table of Contents
2
Specifications
3
Operating Controls
4
Front Panel
4
Rear Panel
5
Controls under the Access Cover
6
Front Panel Parts List
7
Product View
7
Rear Panel Parts List
8
Circuit Description
9
Receiver Circuits
9
Antenna Switching Circuit
9
RF Circuit/If Circuit/Pass Band Tuning Circuit
9
SSB, SW, am Detector Circuit
10
BFO Circuit
10
AF Circuit
10
Transmitter Circuits
11
Noise Blanker Circuit
11
Transmit if Amplifier Circuit
11
Transmit Mixer Circuit
11
Power Amplifier Circuit
12
Low-Pass Filter Circuit
12
APC/ALC Circuit
12
VOX Circuit
12
CW Monitor Circuit
13
Metering Circuit
13
Squelch Stop Circuit
13
Power Supply Circuit
13
PLL (Phase Locked Loop) Unit
14
Local Oscillator Circuit
14
Programmable Divider Circuit
14
Phase Detector and Loop Filter Circuit
14
Driver Unit
15
Power Circuit
15
VCO Unit
15
Lock Failure Detector and Mute Control Circuit
15
CPU Control Circuit
16
Frequency Control, Display and I/O Circuit
18
CPU Malfunction-Prevent Circuit
18
D/A (Digital to Analog) Converter Circuit
18
RIT Control Circuit
18
Scan Clock Generator and Control Circuit
19
Scan Start/Stop Control Circuit
19
In the Scan "A" Mode
19
Scan Start
19
Scan Start/Stop Circuit
20
Scan Start/Stop Timing Chart
20
Scan Stop
21
In the Scan "B" Mode
21
Memory Write
21
Auto Scan Start
21
AC Power Supply Unit
22
PI Unit
22
SW REG (Switching Regulator) Unit
22
Block Diagram
23
Inside Views
25
Options Installation
26
Front Panel Disassembly
29
Maintenance and Adjustment
31
Measuring Instruments Required for Adjustment
31
PLL Adjustment
32
Local Oscillator Level Adjustment
32
Reference Frequency Adjustment
32
VXO Frequency Adjustment
32
Receiver Adjustment
33
FR Band-Pass Filter Adjustment
33
AGC Threashold Adjustment
33
IF Circuit Adjustment
34
S-Meter Adjustment
34
Noise Blanker Adjustment
34
SSB Squelch Adjustment
34
RIT Frequency Adjustment
35
Transmitter Adjustment
36
BFO Frequency Adjustment
36
Idling Current Adjustmen
36
Band-Pass Filter Adjustment
36
RF Power Amplifier Adjustment
37
Carrier Suppression Adjustment
37
ALC (RF Power) Adjustment
37
RF Meter Adjustment
37
MIC Gain (Modulation) Adjustment
38
Printed Circuit Boards
39
Schematic Diagrams
42
Voltage Chart
52
R Output Timing Chart
54
Troubleshooting
55
Display Fails to Illuminate. Abnormal Figure Is Displayed
55
Display Does Not Charge
56
The Set Does Not Work with AC Power Source
57
No Output Power
58
No Receive and Transmit
59
No Receive
60
IC Specifications
61
Parts List
66
Schematic Diagram
87
Other manuals for Icom IC-551
Instruction Manual
59 pages
Need help?
Do you have a question about the Icom IC-551 and is the answer not in the manual?
Ask a question
Icom IC-551 Specifications
General
Supply Voltage
13.8V DC
Power Supply
13.8V DC
Mode
FM
Current Drain
2.5A (max)
IF Frequencies
455 kHz
Output Power
10W (VHF), 8W (UHF)
Related product manuals
Icom IC-551D
90 pages
Icom IC-F6121D-51B
28 pages
Icom IC-V8
68 pages
Icom IC-H6
57 pages
Icom IC-F4
52 pages
Icom IC-2N
9 pages
Icom IC-78
48 pages
Icom IC-A6
44 pages
Icom IC-H2
19 pages
Icom IC-2A
57 pages
Icom IC-705
8 pages
Icom IC-F11
14 pages
Need help?
General
To Next Page
