Table Of Contents - Icom IC-756PROIII Service Manual

Table of Contents

Introduction2
Danger2
Ordering Parts2
Repair Notes2
Table Of Contents3
Specifications4
Antenna Tuner4
Inside Views5
Top View5
Bottom View6
Circuit Description7
Receiver Circuit7
Rf Switching Circuit7
Pre-Amplifier Circuits7
1St If Circuit8
2Nd Mixer Circuit8
2Nd If Circuit8
3Rd Mixer And 3Rd If Circuits8
S-Meter Circuit (Main-A Unit)9
Squelch Circuit (Main-A Unit)9
Twin Pbt Circuit (Dsp-A Board)9
Agc Circuit (Dsp-A Board)9
Transmitter Circuits10
Microphone Amplifier Circuit10
Vox Circuit10
When Fm/Am Modes10
Speech Compressor Circuit11
If Amplifier And Mixer Circuits11
Rf Circuit (Rf-B And Pa Units)11
Low-Pass Filter Circuit (Filter-A Unit)11
Monitor Circuit12
Pll Circuits12
Apc Circuit (Main-A Unit)12
When Ssb/Rtty Modes (Dsp-A Board)12
2Nd Lo And Reference Oscillator Circuits13
3Rd Lo Circuit13
Marker Circuit13
Reference Loop Pll13
Antenna Tuner Circuits14
Matching Circuit (Tuner-A Unit)14
Detector Circuit (Ctrl-A Unit)14
Antenna Tuner Cpu Port Allocation14
Scope Circuits15
Scope Receiver Circuit (Rf-B Unit)15
Power Supply Circuits15
Sweep Lo Circuit (Pll Unit)15
Sub-Cpu Port Allocations16
Main-A Unit16
Ctrl-A And Pll Units16
Logic Circuits16
Main-Cpu Port Allocations17
Input Expander Allocations18
Adjustment Procedures21
Preparation21
Required Test Equipment21
Connections21
Pll Adjustments22
Pll Unit23
Bottom View Of The Transceiver23
Transmitter Adjustments24
Pa Unit25
Rf-B Unit25
Dsp-A Board27
Receiver Adjustments28
Rx Peak28
Mixer Balance28
Tuner Adjustments32
Ctrl-A Unit32
Meter Adjustments33
Parts List35
Display Unit36
Key Unit39
Mic Unit39
Mechanical Parts And Disassembly66
Phone Board66
Display Board66
Mic Board66
Rit Board66
Semi-Conductor Information70
Transistors and Fet's70
Diodes71
Board Layouts72
Display Board (Bottom View)73
Mode Board74
Key Board74
Ten-Key Board74
Ten-Key Board (Bottom View)75
Phone Board (Bottom View)75
Key Board (Bottom View)75
Pbt Board76
Memory Board76
Memory Board (Bottom View)77
Pbt Board (Bottom View)77
Mic Board (Bottom View)77
Rit Board (Bottom View)77
Dsp-A Board (Bottom View)81
Bpf-A Board84
Preamp Board84
Preamp Board (Bottom View)85
Bpf-A Board (Bottom View)85
Pll Unit (Bottom View)87
Filter-A Unit90
Block Diagram96
Voltage Diagrams98
Front Unit98
Tuner-A, Memory Boards And Ctrl-A Unit102
Pa And Filter-A Units112
Main Dial113
Bpf-A, Preamp Boards And Rf-B Unit114