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TRC-447
Radio Shack TRC-447 Service Manual
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— 43 —
SEMICONDUCTOR LEAD IDENTIFICATION
DIODES
TRANSISTORS
B
E
C
1N4003
1N4148
1SS108
HZ5B1
HZ5C1
CA
1SS356
1SS390
HVU307
MA728
A
C
HSM88AS
C/A
AC
2SC2001
2SC941TM-O
A: Anode
C: Cathode
L
TD
-482GC
Cathode
Anode
B
C
E
2SC2078E
2SC2314F
2SA812
2SA1235
2SC2714
2SC5065
F1
E1
A1
G1
D1
C1
B1
F2
E2
A2
G2
D2
C2
B2
1
2
34
56
7
8
9
10
11
12
13
14
15
16
Digit1
Digit2
1Digit
4
AB
C
D
E
F
G
2Digit
5
AB
CD
E
F
G
B: Base
C: Collector
E: Emitter
B
C
E
TLR-124
TLSG-126
Cathode
Anode(GREEN)
Anode(RED)
42
44
Table of Contents
Table of Contents
1
Specifications
2
Cb Transmitter Portion
3
Cb Receiver Portion
3
Weather Radio Section
3
Channel Frequency of Pll Synthesizer
4
Cb Band
4
Wx/Alert Band
4
Block Diagram
5
Alignment Point Locations (Main PCB)
6
Alignment Procedure
6
Alignment of Pll
6
Alignment and Adjustment
6
Alignment of Transmitter Section
7
Preset
7
Alignment Procedure
7
Alignment of Receiver Section
8
System Control Section Clock
10
Troubleshooting
10
Pll Circuit
12
CB no Good
12
WX no Good
13
Does Not Receive
14
Rx Section Check
14
Tx Section Check
15
Does Not Transmit
15
Wiring Diagram
16
Main
17
Printed Circuit Boards
17
SWITCH/VOLUME/LED/MIC/CH SW/SWR Pcbs
19
To Remove the Top and Bottom Covers
20
Exploded View and Disassembly Instructions
20
Mechanical Parts List
23
Main Pcb Assembly
24
Electrical Parts List
24
Switch PCB ASSEMBLY
38
Volume PCB ASSEMBLY
39
Led Pcb Assembly
40
MIC Pcb Assembly
41
Other Electrical Parts
42
Diodes
43
Transistors
43
Semiconductor Lead Identification
43
IC Internal Diagrams
44
IC and Transistor Voltage Chart
46
Main PCB
50
Schematic Diagrams
50
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Radio Shack TRC-447 Specifications
General
Brand
Radio Shack
Model
TRC-447
Category
Radio
Language
English
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