Read Sharp QT-120H (serv.man2) Service Manual online
QT-120H
– 6 –
• NOTES ON SCHEMATIC DIAGRAM can be found on page 5.
A
B
C
D
E
F
G
H
1
2
3
4
5
6
Figure 6 SCHEMATIC DIAGRAM (1/2)
R358
4.7K
R357
4.7K
R362
6.8K
D301
4148
C371
10/10
R361 100K
C370
22/10
Q306
9014
Q305
9014
R360
100
4
4
3
3
2
2
1
1
4
6
10
8
2
1
3
12
11
5
7
9
24
23
22
21
20
19
18
17
16
15
1
1
10
9
8
7
6
5
4
3
2
1
9
8
7
6
5
4
3
2
1
RECORD SIGNAL
PLAYBACK SIGNAL
MW/LW SIGNAL
AM IF
SW101
BAND
SELECTOR
MAIN PWB-A
PLAYBACK
RECORD/
SW201
SW4
BEAT
CANCEL
(ML)
SW301
FUNCTION
SELECTOR
GRAPHIC EQUALIZER
PWB-C
X-BASS
P
R
R
R
P
P
R
R
P
P
R
L104, L105 :
MW/LW BAR ANTENNA
MW/LW BAR ANTENNA
IF AMP. &FM MPX.
IC102
LA1805
FM SIGNAL
FM ROD
ANTENNA
AM IF
1
3
2
BAND SELECTOR
SW101 :
FM OSC.
FM FRONT END
FM DETECTION
FM IF
CF102
10.7MHz
3
2
1
FM IF
SW101 :
BAND SELECTOR
FM BAND PASS
FILTER
CF101
108MHz
3
2
1
RECORD/
PLAYBACK
FM-MONO
FM-ST
FM-ST
FM-MONO
TAPE
TAPE
SW301
FUNCTION
SELECTOR
FUNCTION
SELECTOR
2
1
BUILT-IN
MICROPHONE
ERASE
HEAD
TAPE
C
B A
TAPE
FM-ST
FM-MONO
TAPE
FM-MONO
FM-ST
P
R
R
P
X-BASS
MW
LW
LW
FM
LW
MW
FM
LW
MW
FM
LW ANTENNA
L105
MW ANTENNA
L104
LW
MW
FM
LW
MW
FM
LW OSC.
L108
MW OSC.
L107
MW
LW
FM
MW
LW
FM
R
P
P
HEAD
RECORD/PLAYBACK
L-CH
R-CH
0V
0V
0V
REC : 0.66V
0V
0.17V
0.18V
1.9V
0.17V
0.18V
1.9V
REC : 0.66V
REC : 0.12V
REC : 5.14V
REC : 0.73V
0.61V
6.46V
0V
6.51V
0V
0.4V
2.83V
0.61V
6.48V
0V
0V
0V
0V
2.78V
0V
0.61V
6.53V
2.76V
0.61V
0V
0V
2.82V
9
8
7
6
5
4
3
2
1
12
11
10
PIN
NO.
VOLTAGE
IC201
4.42V
1.36V
4.43V
0V
0.89V
1.6
4.22V
0V
3.75V
9
8
7
6
5
4
3
2
1
PIN
NO. VOLTAGE
IC101
PLAY
REC
V
VC2
TC2
L103
BIAS OSC.
Q202
ZQT8050 D
C232 100/10
R226
10
C233
0.022
R306
220K
C366
1/50
C303 0.012
R317
18K
C309
0.022
C311
0.0068
C3
0.0
C307
560P
R331
R3
8.2
C305 0.0027
R325 8.2K
R323
12K
VR302-B 100K(B)
R321
12K
R319 22K
R335 68K
VR301-B 50K(B)
R315 39K
C150
100/10
C134
220P
C115
0.022
R202
3.3K
C224 1/50
C223
1/50
R201
3.3K
C215
0.0022
(ML)
R211
18K
SW201-A
C204
0.001(ML)
0.001(ML)
C203
0.001(ML)
0.001(ML)
SW201-B
C202 0.001
(ML)
C216
0.0022
(ML)
R212
18K
SW201-H
SW201-G
C201
0.001(ML)
SW201-F
C369
100/10
R311
4.7K
R312
4.7K
C365
1/50
R314 1.5K
R313 1.5K
R309 2.7K
R310 2.7K
C364 220P
C363 220P
R307 120K
R308 120K
Q301 9014 C
Q302
9014 C
C304 0.012
R305
220K
C361 1/50
C362 1/50
R303
10K
R304
10K
R337
560
VC4
R104
47
T101
C104
0.001
L102
FM RF
C101
10P
(CH)
R232
10K
SW301-A
SW301-F
R219
100
SW201-D
R224
3.9K
R231
10K
C219
220/10
C220
47/10
C222 1/50
R220
470K
SW201-C
R204
82
C212
0.027
C210
47/10
R206 5.6K
R208
3.9K
R223
3.9K
R203
82
C211
0.027
(ML)
R205 5.6K
R207 3.9K
C209
47/10
C213
1/50
C214 1/50
IC201
BA3313L
PRE AMP.
C206 100P
C205
100P
C207 680P
C208 680P
R106
820K
C112
0.022
R132
3.9K
T102
C140
0.0047(ML)
C143
470P
SW101-B
D101
1N4148
C106
22P
(CH)
R103
33
R135
5.6K
R1
10
R133
10K
C
1
C153
1/50
VC3
SW101-A
SW101-H
TC102
C129
56P(CH)
SW101-G
R122
100
C125
5P(CH)
SW101-F
BAND
SELECTOR
C132
0.022
R125
33K
C142
3.3/50
C141
0.0082(ML)
T103
C108
10/10
C114
0.022
R101
10
C107
0.001
C102
0.001
R102
100
D102
1N4148
SW301-B
D201 1N4148
R228
100
C228
330P
C227 180P
C229 0.0018
(ML)
C312
0.0068
VR302-A 100K(B)
R318
18K
C310
0.022
R301
1K
C301
0.001
R302
1K
C302
0.001
C31
0.00
C308 560P
R332
R3
8.2
C306 0.0027
R326 8.2K
R324
12K
R322
12K
R320 22K
R336 68K
VR301-A 50K(B)
R316 39K
C133 0.022
SW101-D
SW101-E
R138
47
C127
220P
C126
360P
C130
180P(CH)
TC4
TC103
C122
12P(CH)
R105
220K
C138
0.022
C136
0.022
C135
10/10
C137
0.022
CF103
460kHz
C139
22/16
C124 0.022
TC3
C121
10P
(CH)
C109 20P
(CH)
C111
33P
(CH)
C110
3P(CH)
VC1
TC1
IC101
LA1186N
R215
1K
R218
2.2K
R222
100K
R221
100K
R214
2.7K
R213
2.7K
C218
0.01
C221
10/10
R217
1K
R216
2.2K
C217
0.22/50
MIC201
R229
100
C230
0.0056(ML)
R225
47K
T201
BIAS
OSCILLATION
C231
0.022(ML)
CNP201
CNS201
R227
100
SW201-E
SW301-E
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