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Receiver
iC- r8500
Service manual
Table Of Contents - Icom IC-R8500 Service Manual
Communications receiver
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Also See for IC-R8500
:
Service manual addendum
(286 pages)
,
Service manual
(100 pages)
,
Instruction manual
(48 pages)
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Table Of Contents
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Contents
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Table of Contents
Repair Notes
2
Table Of Contents
3
Specifications
4
Inside Views
5
Main, Rf-B And Mix Units View
5
Pll, Conv And Rf-A Units View
5
Disassembly And Option Installations
6
Cr-293 High Stability Crystal Unit
7
Circuit Description
8
Receiver Circuits
8
Rf Convertor Circuit (Conv Unit)/Rf Attenuator Circuit (Conv Unit)
8
Vhf/Uhf Rf Circuit (Rf-B Unit)/Tuned Notch Circuit (Rf-B Unit)
8
Vhf/Uhf 1St Mixer Circuit - Rf-B Unit
9
Vhf/Uhf 1St If And 2Nd Mixer
9
Hf Rf Filter Circuit - Rf-A Unit
9
Hf 1St Mixer Circuit - Rf-A Unit
10
Hf 2Nd Mixer Circuit - Rf-A Unit
10
If Circuit - Main Unit/3Rd Mixer Circuit - Main Unit
10
Demodulator Circuit - Main Unit
10
Squelch Control Circuit - Main Unit
11
Squelch Circuit - Main Unit
11
Af Amplifier Circuit - Main Unit
12
Noise Blanker Circuit - Main Unit
12
Agc Circuit - Main Unit
12
S-Meter Circuit - Main Unit/Apf Circuit - Main Unit
12
Pll Circuits
13
Center Detector And Center Indicator Circuits - Main Unit
13
Vsc Circuit - Main Unit
13
1St/2Nd Lo Pll Circuit - Pll Unit
13
Convertor Pll Circuit - Conv Unit
14
Pll Circuits Diagram
14
Power Supply Circuits
15
Port Allocations
15
Voltage Lines
15
Cpu - Main Unit, Ic33
15
Sub Cpu (Disp Unit, Ic1)
16
Dds Etc-Latch (Pll Unit, Ic3)
16
I/O Expander Ics
16
Meter Reference Adjustment
18
Power Supply Voltage And Pll Adjustment
18
Main Unit Diagram
19
Pll Unit Diagram
19
Receiver Adjustment
20
Conv And Rf-A Units Diagram
21
Main, Mix And Rf-B Units Diagram
21
Rf-B Bpf Tuned Voltage Adjustment
24
Noise Squelch, S-Meter And Center Indicator Adjustment
26
S-Meter Flat Adjustment
27
Parts List
28
Front Unit Parts List
28
Disp Unit Parts List
28
Sw-A Board Parts List/Sw-B Board Parts List
29
Vr-A Board/Vr-B Board Parts List
29
Jack Board Parts List
29
Pll Unit Parts List
29
Vco-A Board Parts List
34
Vco-B Board Parts List
35
Main Unit Parts List
36
Mix Unit Parts List
43
Rf-A Unit Parts List
44
Rf-B Unit Parts List
46
Conv Unit Parts List
49
Mechanical Parts
52
Exploded Views
53
Semi-Conductor Information
58
Transistors And Fet's
58
Board Layouts
60
Front - Boards
60
Disp Unit Board
61
Sw-A Board
61
Sw-B Board
62
Main Unit Board
65
Rf-A Unit Board
71
Rf-B Unit Board
73
Vco-A And Vco-B Boards
74
Pll Unit Board
75
Mix And Conv Units Board
78
Block Diagram
81
Voltage Diagram
85
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Table of Contents
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