WQ-730H (serv.man2) - Sharp Audio Service Manual (repair manual). Page 12

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WQ-730H
– 12 –
• NOTES ON SCHEMATIC DIAGRAM can be found on page 11.
Figure 12 SCHEMATIC DIAGRAM (1/2)
A
B
C
D
E
F
G
H
1
2
3
4
5
6
8.2V
(0V)
0.7V
HI-SPEED DUBBING : (     )
MIC REC : <   >
(0V)
HI-SPEED DUBBING : (     )
NORMAL SPEED       : OTHER
2.2V
0.7V
0.1V
(0V)
(0.7V)
<0.7V>
<0V>
<0V>
10.9V
(10.8V)
10.3V
(10.3V)
10.9V
(6.9V)
(0V)
0.7V
0V
(0V)
(10.2V)
0V
(0.7V)
0V
0V
(0V)
7.6V
12V
0.4V
0.6V
4.6V
ERASE
HEAD
TAPE1
TAPE2
R-CH
L-CH
R-CH
L-CH
PLAYBACK HEAD
RECORD/PLAYBACK
HEAD
4
3
2
CNS103
1
3
2
CNS101
1
CNP106
2
CNS105
2
1
1
C178
4.7/50
C172 10/25
SW1H
SW1D
BAND
SELECTOR
SW1F
BAND
SELECTOR
C40
0.001
SW1B
SW1E
SW1G
SW1C
SW1A
MIC101
BUILT-IN
MICROPHONE
C508 0.02
C509
0.02
SW103B
D103
1N4148
R157
5.6K
C187 330P
C185
330P
C186
330P
C188
330P
C114 330P
A
B
MAIN PWB-A1
VC7
VC8
FM
STAND-BY
/TAPE
POWER ON
/RADIO
STAND-BY
/TAPE
POWER ON
/RADIO
SW401C
SW401D
STAND-BY/TAPE
POWER ON/CD
SW401
FUNCTION
SW401A
MIC ON
HIGH
TC7
TC8
POWER ON/RADIO
STAND-BY/TAPE
SW401B
FUNCTION
3
1
FM STEREO
FM MONO
3
1
L1
TC5
VC5
FM
ROD ANTENNA
D1
1N4148
MW
LW
FM
SW101 :
RECORD/PLAYBACK
4
3
2
CNP104
1
3
2
CNP102
1
P
R
P
R
P
R
P
R
SW101C
SW101E
SW101D
SW101F
C156 820P
C158 820P
C154 130P
L102
22mH
C152 150P
C151
150P
+B
+B
+B
+B
R510 56K
R12
100K
SW103A
FM MONO/FM STEREO
R10
470K
LW
MW
FM
SW1 : BAND SELECTOR
FM
MW
LW
FM
MW
LW
+B
SW103
DUBBING SPEED
/MIC
+B
LW
MW
FM
+B
+B
+B
+B
+B
+B
C182
0.0082
(ML)
C181
0.0082
(ML)
R178
22K
R177
22K
+B
C177
4.7/50
C173
0.001
C183
330P
R167
180K
R171
330K
R169
2.2K
C171 10/25
R175
47K
C175
0.015
(ML)
R173
220
L103
2.7mH
C174
0.001
C184
330P
R168
180K
R172
330K
R170
2.2K
R176
47K
C176
0.015
(ML)
R174
220
L104
2.7mH
+B
+B
+B
L105
SW101 : RECORD/PLAYBACK
R107
4.7K
L101
22mH
SW401 :
FUNCTION
SELECTOR
R181
22K
AM IF
AM IF
PRE AMP.
NORMAL
R119
4.7K
D104
1N4148
R126
22K
R
P
R114
4.7K
MIC AMP.
Q101
9014 C
C103
0.018
(ML)
FM
MW
LW
FM
MW
LW
LW
MW
FM
LW
ANTENNA
MW
BAR ANTENNA
FM BAND PASS
FILTER
FM RF
OSC.
L2
R2
33
FM IF
FM IF
CF1
10.7MHz
FM DET
C29
0.0015
(S)
VCO
Q504 : MOTOR CONTROL
TAPE
SPEED
RADIO
Q502, Q503 : SWITCHING
R505
10K
C505
0.02
D502
MTZJ8.2C
C504 220/10
VOLTAGE
REGULATOR
C506
0.02
C159
10/25
R156
180K
C160
10/25
R158
5.6K
R160
4.7K
BIAS
OSC.
R123
100
P
R
R120
27K
C117
0.0082
(ML)
C
BIAS
OSC.
R507
100K
T3
R3
220K
IC1
TA7378P
FM FRONT END
C12
5P
(CH)
C17
240P
(S)
L6
MW
OSC.
L7
LW
OSC.
2
C20
0.02
R117
10K
R127
100
C167
22/16
C170 4.7/50
C169 4.7/50
C168 2.2/50
C23
0.04
C26
470P
C24
0.0039
(ML)
2
R4
47
C6
22P (RH)
C2
0.001
C1
10P
(CH)
C3
22P
(CH)
BPF1
GND
VCC
RF AMP.
OSC
MIX
VCO
AM
OSC
AM
RF
VCC
AM
DET
FM
DET
OUT
MPX
IN
R-CH
L-CH
GND
GND
AM
IF
AM
MIX
FM IF
IN
ALC
REC
IN
REC
NF
REC
OUT
VCC
A/B
PRE
OUT
MATAL
OUT
NF
CH2
/B
CH2
/A
CH1
/A
CH1
/B
NF
MATAL
OUT
PRE
OUT
MIX
OUT
GND1
M/N
REC
OUT
REC
NF
REC
IN
GND
R14
820
R20 470
R8
100
TC4
C14
7P
(CH)
C15
300P
C16 180P
C30
1/50
C5
0.02
VC6
TC6
R1
100
C43 0.02
C4
5P
(CH)
C41
0.001
C8
15P
(CH)
C7
3P
(CH)
D2
1N4148
R9
3.9K
T2
C25
0.0082
(ML)
R11
12K
C27
3.3/50
C28
3.3/50
VR1
10K (B)
R13
15K
C31
100/10
C32
0.02
R17
2.7K
R18
2.7K
C38
4.7/50
C37
4.7/50
R15
10K
R16
10K
C36
0.012 (ML)
C35
0.012 (ML)
CF2
460kHz
C34 22/16
C33
0.04
IC2
LA1805
IF AMP.&FM MPX.
C39
4.7/50
3
2
1
L4
L3
TC2
T1
1
2
3
4
5
6
7
8
9
C42
0.001
C9
0.02
R5
100
C44 0.02
C21
10/16
C22
0.02
24
23
22
21
20
19
18
17
16
15
14
13
11
10
12
9
8
7
6
5
4
3
2
1
R182
22K
R180 22K
C507
100/25
R509
6.8K
R508
470
VR501
2.2K (B)
Q504
8555 D
Q503
9014 C
R504
10K
R503
10K
Q502
9014 C
C502
0.02
C503
0.02
R501
680
R502
100
Q501
8050 D
D501
1N4148
R179
22K
R105
1K
R106
8.2K
C102
10/25
C101
1/50
R109
1K
R108
100
C104
0.001
R110 4.7K
C105
1/50
R111
330K
C106
220P
R112
68
R113 47K
C107
1/50
MIC
MUTING
Q102
9014 C
R115
220
C108
47/10
R116
10K
C109 10/25
D6
1N4148
D5
1N4148
D101
1N4148
R118
10K
C110
10/25
R124
22K
D102
1N4148
R151
12K
C153
130P
Q103
9014 C
LINE AMP.
C163 4.7/50
C165
2200/10
R163
10K
C166
22/16
R166
10K
R164
10K
C164
4.7/50
D105
1N4148
D106
1N4148
R161
22K
R162
22K
C155 820P
C157 820P
R153
56
R154
56
R185
33K
R186
33K
C161
0.033
(ML)
C162
0.033
(ML)
R159
4.7K
R155
180K
R183
1M
C179 22/16
R125
220
C113
120P
SW102
BEAT
CANCEL
C115
0.001 (ML)
C116
0.02
C119 100/10
C118
0.012
(ML)
R121
47
R122
100
Q105 8050 D
R131
10K
R152
12K
TA8189N
IC101
L501
22
µ
H
SW101A
RECORD/
PLAYBACK
SW101B
23
24
21
22
19
20
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
C11
39P (CH)
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