ICOM IC-751 Manuals

Manuals and User Guides for ICOM IC-751. We have 2 ICOM IC-751 manuals available for free PDF download: Service Manual, Instruction Manual

Icom IC-751 Service Manual (164 pages)

Brand: Icom | Category: Transceiver | Size: 27.74 MB

Table of Contents
2
Specifications
3
Operating Controls
4
Front Panel
4
Power Switch
4
T/R (Transmit/Receive) Switch
4
Top Cover
8
Rear Panel Connections
9
Operating Instructions
10
How to Tune
10
Preset
10
Ham Band/General Coverage Selection
10
Frequency Display on each Mode
11
Tuning Control
11
Dial Lock Switch
12
VFO Switch
12
Duplex (Split) Switch
13
Transferring VFO Frequency
13
RIT (Receive Incremental Tuning)
13
XIT (Transmit Incremental Tuning)
14
Memory Channel Operation
15
Dial Function Select Switch (in VFO Mode)
15
Memory Channel Selection
15
Dial Function Select Switch (in Memory Channel Mode)
16
Tuning by Up/Down Buttons on the Microphone
17
Memory-Write (Programming the Memory Channels)
17
Memory Clearing
17
Frequency Control
17
Scanning Operation
18
Memory Channel Selecting
18
Memory Scan
18
Mode Selective Scan
18
SSB Operation
19
Resuming Scan
19
Receiving
19
NB (Noise Blanker)
20
AGC (Automatic Gain Control)
20
Preamp/Att Switch
20
P.B. (Pass-Band) Tuning
20
CW Operation
21
Notch Filter
21
Transmitting
21
How to Use the Speech Processor
21
RTTY Operation
22
CW Side-Tone (Monitor)
22
Break-In Operation
22
AM Operation
23
FM Operation
23
General Coverage Receiver
23
Other Operations
24
VSWR Reading
24
WWV Reception
24
Simple Frequency Alignment
24
Receive Antenna Terminals
25
Transverter Connection
25
Linear Amplifier Connection
25
Cooling Fan
25
Accessory (ACC) Socket ET
26
Cautions
26
Circuit Description
27
Receiver Circuits
27
RF Circuits/Connector/Rf Units
27
IF Circuits
27
Noise Blanker Circuit
28
Filter Select Circuit
28
FM Unit
28
AF Circuit (Main Unit)
29
AGC and Squelch Circuits
29
Transmitter Circuits
30
AF Circuits
30
VOX Circuit
30
ALC and Metering Circuits
31
Power Supply Circuit
31
RF Circuits
32
PA Unit
32
Filter/Connector Unit
32
RF Unit Block Diagram
32
Pll Unit
33
Reference Frequency Oscillator and Marker Circuits
33
PLL Sub-Loop Block Diagram
33
Main Loop Circuits
34
Pll IC
34
Vco
34
Loop System
34
Sub-Loop
35
Loop Filter and Mute Circuits
35
In-Loop Local Oscillator Circuit
35
Sub-Loop Block Diagram
35
Logic Unit
36
PLL Data
36
Cpu
36
How to Derive the N-Data
36
CPU Pin Connection
37
CPU Memory Map
37
Custom IC Pin Connection
37
I/O Expander Circuit
38
N-Data of PLL
38
High & Low N-Data Table
38
N-Data Output Timing Chart
38
Matrix Unit
39
Y0 - DB0-DB3 (Ten Key)
39
Y0 - DB4 (Scan Start/Stop)
39
Y1 - Db4 (Vfo A/B)
39
Y1 - DB5 (Memory Read)
40
Y1 - DB6 (Ham/General)
40
Y1 - DB7 (Rit On/Off)
40
Y2 - DB8 (Function)
40
Display Unit
42
Display Unit Circuit
42
Display Section
43
DC-DC Converter Section
43
Block Diagram
44
Inside Views
48
Top View
48
Bottom View
49
RF Unit
49
Option Installations
50
Installation of Optional Filter
50
Optional Filters Prepared
50
Assembly Procedure
50
Built-In Power Supply Unit IC-PS35
51
Voice Synthesizer Unit IC-EX310
52
How the Voice Synthesizer Unit Works
53
High-Stability Crystal Unit CR-64
53
Mechanical Parts and Disassembly
55
Front Panel Parts 1
57
Front Panel Parts 2
59
Front Panel Connector Connections
61
Main Unit Side Connector Connections
63
Logic-Pll Unit Side Connector Connections
64
RF Unit Side Connector Connections
65
Filter Unit Side Connector Connections
66
Rear Panel Connector Connections
67
Rear Panel Parts
68
PLL Adjustment
69
Main Unit (Common Circuits) Adjustment
71
Main Unit
72
Receiver Adjustment
73
Transmitter Adjustment
77
Meter Switch/Filter Units
81
Voltage (Circuit) Diagrams
82
Main Unit Circuit and Voltage Diagram
82
Voltage Chart for Mode VS Filter Switch
84
Local Oscillator Oscillating Level
84
RF Unit Circuit and Voltage Diagram
85
PLL Unit Circuit and Voltage Diagram
87
PLL Sub-Loop Circuit and Voltage Diagram
89
Logic Unit Circuit and Voltage Diagram
90
PA Unit Circuit and Voltage Diagram
93
Display Unit Circuit and Voltage Diagram
95
Front Unit Circuit Diagram
96
Matrix Unit Circuit Diagram
98
Mode Switch
98
Filter Unit Circuit Diagram
100
Unit Wiring Diagram
101
IC Ratings
105
Pc1037H(Double Balanced Modulator)
105
PC1181H (Audio Power Amplifier)
105
LA2600 (Dual Attenuator)
106
PD549C (Programmable Display Controller)
106
Parts List
112
Schematic Diagram
138
Unit Layout
163

ICOM IC-751 Instruction Manual (37 pages)

HF all band transceiver, general coverage receiver

Brand: ICOM | Category: Transceiver | Size: 6.39 MB

ICOM Categories

Transceiver Receiver Repeater Radio Two-Way Radio

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Icom IC-751 Service Manual (164 pages)

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ICOM IC-751 Instruction Manual (37 pages)

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