Service manual
QT-CD131/131C
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A
B
C
D
E
F
G
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1
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34 5
6
Figure 16 SCHEMATIC DIAGRAM (5/6)
• NOTES ON SCHEMATIC DIAGRAM can be found on page 8.
8
7
3 2
6
5
4
9
1
C12
0.022
R4
10
C7
0.001
R2
100K
C6
0.01
Q1
2SC1674K
C2
0.01
C3
4.7P
T1
R56
47
R3
33K
CF1
C15
0.022
C16
0.022
C14
0.022
R1
22
C5
0.01
R6
680
R8
47K
C13
10/16
IC1
TA7358AP
C9
33P(CH)
C8
15P
L1
FM RF
C60
100P
R9
100K
VD3-1
KV1581A
C17
0.047
R12
4.7K
L4
R10
68K
VD3-2
KV1581A
C19
18P(UJ)
C20
470P
R11
56K
R7
4.7K
C18
0.022
C52
0.022
C51
10/16
TC1
20P
VD1
KV1360NT
C10
24P(UJ)
C11
22P
(CH)
R5
10K
L2
FM 0SC
14
15
1 2
4
5
3
6
7
8
20 19 18
17
16
24 23
22
13
TP303
21
12
11
9
10
TP2
TP1
C42
3.3/50
C32
0.022
C31
0.022
C33
22/16
C38
0.018
C41
3.3/50
C39
3.3/50
R26
1.5K
IC2
LA1805
C36
0.0022
R27
47K
R29
1.2K
VR1
6.8K(B)
C43
0.0015
R30
15K
T2
R25
33K
R37
6.8K
R38
6.8K
C40
470P
Q10
2SC1815GR
R28
10K
C34
220/10
C35
0.022
C49
1/50
T3
CF2
R35
2.2K
R36
2.2K
C46
0.022
C37
0.022
Q8
2SC1815GR
Q7
2SC1815GR
R34
4.7K
R33
4.7K
R44
270
ZD1
MTZ5.1B
R23
47K
R19
10K
C28
47/16
Q5
2SA673-C
R18
47K
Q3
2SC1815GR
C24
2.2/50
R15
1.2K
R42
4.7K
D3
1N4148
R39
10K
Q9
2SA673-C
R40
47K
R41
22K
D4
1N4148
R32
33K
C44
1/50
R31
1K
C50
0.022
R45
220
R22
47K
C22
0.01
R52
1K
R51
1K
R55
10K
R14
10K
C53
0.022
R13
390
R24
3.9K
AM TRACKING
AM MIX
AM OSC
AM +B
AM RF
FM +B
FM DET
GND
TUN IND
VCO
NC
L CH
AM /FM
R CH
R70
22K
1
2
3
+B
1
2
3
C48
1/50
+B
+B
FB
B.P.F
1
2 3
F1
D1
1N4148
GND(D)
TUNER +B
PLL(DATA)
PLL(CLOCK)
PLL(PERIOD)
CNP501
1
2
3
4
5
6
7
8
9
10
STEREO
TUNED
MUTE
MONO/STEREO
BACK UP
C55
330P
+B
+B
+B
+B
R43
47K
R17
10K
Q4
2SC1815GR
C25
0.001
R16
2.2K
C26
0.022
+B
+B
R21
5.6K
R20
6.8K
Q6
2SC1815GR
C56
0.01
AM OSC.
L3
AM ANT.
+B
+B
FM DET.
AM IF
FM IF
9
10
11
12
14
1
2
3
4
5
6
7
8
X1
4.5MHz
C29
12P
(CH)
C30
15P(CH)
IC3
TC9216P
PLL
C57
100/10
C21
0.022
L5
470µM
+B
C54
0.022
C27
0.022
16
15
13
X OUT
X IN
DATA
CLOCK
PERIOD
OT-1
OT-2
OT-3
I/O5(ST)
IF-IN
AM-IN
FM-IN
GND
DO 1
DO 2
VDD
P17 11 - H
TO TUNER
DISPLAY PWB
CNS501
R-CH
GND(A)
L-CH
1
3
2
4
TUNER +B
1
2
GND
2
CNP502
1
FW502
P14 1 - F
TO MAIN
SECTION
CNS502
P14 1 - E
TO MAIN SECTION
FM
ROD ANTENA
FM SIGNAL
AM SIGNAL
FM FRONT END
D2
1N4148
C4
22P(CH)
VD2
KV1360NT
C47
1/50
C45
0.022
AM BAND COVERAGE
+B
FM / AM IF MPX.
VCO
BACK UP
+B
+B
MAIN PWB-A1(3/3)
R50
1K
FM IF
IN
AM IF
DET OUT
ST IND
MAX- IN
FM- M/ST
R46 56K
R49 2.7K
R48 56K
R47 56K
FM BAND
COVERAGE
C58
0.022
SWITCHING
RF AMP.
Q3,Q4: VT CONTROL
Q5,Q6: FM RIPPLE FILTER
fL fH