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TRC-447
Radio Shack TRC-447 Service Manual
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— 45 —
IC402
XC61CC4302PR/X
C61AC4302PR
+
−
Vref
V
IN
V
OUT
V
SS
1: Input
2: Ground
3: Output
1
2
3
ST
ARTING
CIRCUIT
CURRENT
GENERA
TOR
REFERENCE
VOL
T
AGE
ERROR
AMPLIFIER
THERMAL
PROTECTION
SOA
PROTECTION
SERIES
PA
S
S
ELEMENT
INPUT 1
2 OUTPUT
3
3 GND
IC502
L7808CV
12345
1: Non inverting input
2: Inverting input
3: Ground
4: Output
5: Supply voltage
IC501
TDA2003V
5
R10
Q15
4
Q16
3
G5
R9
Z4
D6
G4
Q14
D8
D7
Q13
Q12
Q11
D5
Q10
D4
G3
Q7
Q9
Q8
Q6
C1
C2
R7
D3
Q5
R8
G2
Q4
2
1
R6
D1
D2
R5
Q3
G1
Z3
Z2
Z1
R3
R4
Q1
R2
R1
Q2
IC403
RH5RL50AA
+
−
V
IN
V
OUT
GND
Vref
2
3
1
IC405
A
T24CO2N
A0
A1
A2
GND
VCC
WP
SCL
SDA
123
123
1
2
3
4
8
7
6
5
44
46
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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