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IC-375A
Icom IC-375A Manuals
Manuals and User Guides for Icom IC-375A. We have
1
Icom IC-375A manual available for free PDF download: Service Manual
Icom IC-375A Service Manual (108 pages)
220 MHz all mode transceiver
Brand:
Icom
| Category:
Transceiver
| Size: 28.55 MB
Table of Contents
Table of Contents
3
Specifications
4
Outside and Inside Views
5
Front Panel
5
Inside Views
8
PLL and Logic Units
8
Main and RF YGR Units
8
PA and REG Units
9
Block Diagram
10
Circuit Description
12
Receiver Circuits
12
Antenna - Mixer Circuit
12
Noise Blanker Circuit
12
3Rd Mixer Circuit
13
FM Squelch, FM S-Meter and Center Meter Circuits
13
Transmitter Circuits
14
CW Mode
14
TX Amp Antenna
15
Standby Control Circuit
16
PLL Circuits
16
Reference Oscillator Circuit
17
Main Loop
17
Sub Loop
18
Direct Digital Synthesizer Unit
18
PLL Data
18
Logic Circuits
19
Cpu
19
FM Mode
19
CW, LSB or USB Mode
19
Matrix
20
Switching Regulator Circuit
24
Mechanical Parts and Disassembly
25
Frame Disassembly
25
Front Panel Disassembly
27
Front, Logic and PLL Units Connector Assembly
30
Maintenance and Adjustments
33
Preparation before Servicing
33
PLL Adjustment
34
PLL and DDS Units
35
Frequency Adjustment
36
Main Unit
37
Receiver Adjustment
38
Transmitter Adjustment
42
Board Layouts
48
Front Units
48
PLL Unit
57
DDS Unit
59
Voltage Diagrams
70
Logic Unit
71
Parts List
80
Schematic Diagram
97
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