Table Of Contents - Icom IC-551 Maintenance Manual

Table of Contents

Table Of Contents2
Specifications3
Operating Controls4
Front Panel4
Rear Panel5
Controls Under The Access Cover6
Front Panel Parts List7
Product View7
Rear Panel Parts List8
Circuit Description9
Receiver Circuits9
Antenna Switching Circuit9
Rf Circuit/If Circuit/Pass Band Tuning Circuit9
Ssb, Sw, Am Detector Circuit10
Bfo Circuit10
Af Circuit10
Transmitter Circuits11
Noise Blanker Circuit11
Transmit If Amplifier Circuit11
Transmit Mixer Circuit11
Power Amplifier Circuit12
Low-Pass Filter Circuit12
Apc/Alc Circuit12
Vox Circuit12
Cw Monitor Circuit13
Metering Circuit13
Squelch Stop Circuit13
Power Supply Circuit13
Pll (Phase Locked Loop) Unit14
Local Oscillator Circuit14
Programmable Divider Circuit14
Phase Detector And Loop Filter Circuit14
Driver Unit15
Power Circuit15
Vco Unit15
Lock Failure Detector And Mute Control Circuit15
Cpu Control Circuit16
Frequency Control, Display And I/O Circuit18
Cpu Malfunction-Prevent Circuit18
D/A (Digital To Analog) Converter Circuit18
Rit Control Circuit18
Scan Clock Generator And Control Circuit19
Scan Start/Stop Control Circuit19
In The Scan "A" Mode19
Scan Start19
Scan Start/Stop Circuit20
Scan Start/Stop Timing Chart20
Scan Stop21
In The Scan "B" Mode21
Memory Write21
Auto Scan Start21
Ac Power Supply Unit22
Pi Unit22
Sw Reg (Switching Regulator) Unit22
Block Diagram23
Inside Views25
Options Installation26
Front Panel Disassembly29
Maintenance And Adjustment31
Measuring Instruments Required For Adjustment31
Pll Adjustment32
Local Oscillator Level Adjustment32
Reference Frequency Adjustment32
Vxo Frequency Adjustment32
Receiver Adjustment33
Fr Band-Pass Filter Adjustment33
Agc Threashold Adjustment33
If Circuit Adjustment34
S-Meter Adjustment34
Noise Blanker Adjustment34
Ssb Squelch Adjustment34
Rit Frequency Adjustment35
Transmitter Adjustment36
Bfo Frequency Adjustment36
Idling Current Adjustmen36
Band-Pass Filter Adjustment36
Rf Power Amplifier Adjustment37
Carrier Suppression Adjustment37
Alc (Rf Power) Adjustment37
Rf Meter Adjustment37
Mic Gain (Modulation) Adjustment38
Printed Circuit Boards39
Schematic Diagrams42
Voltage Chart52
R Output Timing Chart54
Troubleshooting55
Display Fails To Illuminate. Abnormal Figure Is Displayed55
Display Does Not Charge56
The Set Does Not Work With Ac Power Source57
No Output Power58
No Receive And Transmit59
No Receive60
Ic Specifications61
Parts List66
Schematic Diagram87