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Transceiver
IC-765
Service manual
Table Of Contents - Icom IC-765 Service Manual
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Also See for IC-765
:
Instruction manual
(60 pages)
,
Service manual
(90 pages)
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Table Of Contents
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Contents
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Table of Contents
Table Of Contents
2
Specifications
3
Introduction
5
Ordering Parts
5
Danger
5
Repair Note
5
Inside Views
6
Top View
6
Red And Tuner (Tuc) Units Are Attached
6
Red And Tuner (Tuc) Units Are Removed
6
Bottom View
7
Reg Unit View
7
Tuner Unit View
8
Pa Unit View
8
Circuit Description
9
Receiver Circuits
9
Rf Switching Circuit (Ant Sw And Rf Units)
9
Rf Bandpass Filter (Rf Unit)
9
1St Mixer Circuit (Rf Unit)
10
Exactness 1St, 2Nd If Frequency
10
If Circuit (Main Unit)
10
Receiver If Circuits
10
Noise Blanker Circuit (Main Unit)
11
Notch Filter Circuit (Main Unit)
11
If Shift Oscillator (Main Unit)
11
Bfo Circuit (Main Unit)
11
Demodulator Circuits (Main Unit)
12
Af Input Mode Selector Switch (Main Unit)
12
Af Amp Circuit (Main Unit)
12
Agc And S-Meter Circuit (Main Unit)
12
Squelch Circuit (Main Unit)
13
Transmitter Circuits
13
Mic Amplifier (Main Unit)
13
Compressor Circuit (Main Unit)
13
Cw/Rtty Carrier Oscillator (Main Unit)
14
Fm Tx Oscillator (Main Unit)
14
If Circuits (Main And Rf Units)
14
Rf Circuits (Rf And Pa Units)
14
Filter Unit
15
Antenna Switching Circuit (Ant Sw Unit)
15
Alc Circuit (Main Unit)
15
Apc Circuits (Main Unit)
15
Ce Keying Circuit (Main Unit)
16
Cw Sidetone Circuit (Main Unit)
16
Transmitter Meter Circuits (Main Unit)
16
T/R Switching Circuit (Main Unit)
16
Pll Circuit Block Diagram
17
Reference Oscillator Circuit
17
Pll Circuits
17
General Description
17
Main Loop
18
Sub Loop
18
Mute Circuit
18
Logic Circuits
18
Band Selection Data
19
Key Matrix (Matrix Unit)
19
Antenna Tuner Circuits
19
Motor Control Circuit
19
Tuner Unit Cpu Port Allocations
20
Power Supply Circuits
20
Rectifier Circuit (Reg Unit)
20
Start-Up Circuit (Reg Unit)
20
Switching Regulator (Reg Unit)
21
Regulator Circuits
21
Switching Regulator Block Diagram
21
8 And 5 V Regulators
21
Mechanical Parts And Disassembly
22
Frame Disassembly
22
Frequency Key Button
22
Front Panel
25
Rear Panel Parts List
28
Tuner And Mkr Sw Units
31
Unpacking
33
Other Unit Connector Assembly
34
Front Unit View
34
Reg, Pll, Mkr And Tuner Units
35
Main And Rf Units
36
Rear Panel
37
Parts List
38
Display Unit
38
Mkr Unit
38
Sensor Unit
38
Front Unit
39
Swr Unit
40
Dds Unit
41
Tuner Unit
61
Reg Unit
63
Adjustment Procedures
65
Preparation Before Servicing
65
Required Test Equipment
65
Connection
65
Pll Adjustment
66
Pll Unit View
67
Receiver Adjustment
68
Main Unit View
69
Transmitter Adjustment
73
Nb Vr Unit
75
Filter Unit View
79
Tuner Unit Adjustment
80
Tuc Unit
81
Tdet Unit (Located Under The Tuc Unit)
81
Reg Unit Adjustment
82
Board Layout
83
Display, Mkr Sw And Sensor Units
83
Logic Unit
85
Front (Nb Vr) Unit
87
Front (Nb Sw) Unit
87
Front (Led) Unit
88
Front (Af Vr) Unit
88
Pll And Dds Units
89
Component Side
89
Foil Side
89
Front (At Sw) Unit
90
Front (Swr) Module
90
Front (Notch) Unit
90
Pll Unit
91
Idc Unit
93
Vox Unit
93
Main Unit
94
Matrix Unit
97
Rf Unit
99
Pa Unit
101
Pa (Acc) Unit
101
Pa (Ant Sw) Unit
102
Pa (Keyer) Unit
102
Tuner (Tuc) Unit
103
Tuner (T Det) Unit
103
Tuner (Relay) Unit
104
Reg And Filter Units
105
Block Diagram
107
Voltage Diagrams
111
Front, Main And Pa Units
111
Display, Matrix, Logic, Pll, Rf And Mkr Sw Units
121
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