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IC-M502
Icom IC-M502 Service Manual
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2 - 2
2-2 HM-127 (OPTIONAL
UNIT)
LCD
(DS1: A0119)
• BOTTOM VIEW
CPU
(IC1:
µ
PD789405AGK-A30-9EU)
Data buffer circuit
System clock
(X1: CSTCC4.91MG)
8V regulator
(IC6: TA7808F)
Dimmer circuit
Reset IC
(IC7: S-80928ANMP)
MIC amplifier
(IC4: NJM2125F)
5V regulator
(IC5: TA78L05F)
Volume IC
(IC3: M62429FP)
AF/MIC switch
(IC9: TC4W53FU)
AF amplifier
(IC2: TA7368F)
• TOP
VIEW
6
8
Table of Contents
Default Chapter
3
Table of Contents
3
Specifications
4
Inside Views
6
IC-M502
6
Hm-127 (Optional Unit)
7
Disassembly Instruction
8
Circuit Description
9
Receiver Circuits
9
Transmitter Circuits
10
Pll Circuit
11
Dsc Circuit
12
Power Supply Circuits
12
Logic Circuits
12
Port Allocations
12
Adjustment Procedures
14
Preparation
14
Pll Adjustments
15
Transmitter Adjustments
16
Receiver Adjustments
17
Section 7 Mechanical Parts
18
Parts List
18
IC-M502
18
Section 9 Board Layouts
19
Section 8 Semi-Conductor Information
19
Vol Unit
19
Dial Unit
19
Sql Unit
19
Logic Unit
31
Main Unit
33
Ctrl Unit
35
Pwr-Cord Unit
35
Hm-127 (Optional Unit)
35
Block Diagram
37
Voltage Diagram
38
Logic Unit
38
Main Unit
39
Hm-127 (Optional Unit)
41
Hm-126
42
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Instruction Manual
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Icom IC-M502 Specifications
General
Brand
Icom
Model
IC-M502
Category
Transceiver
Language
English
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