Read Sharp QT-CD250 (serv.man6) Service Manual online
QT-CD250H/W
– 14 –
A
B
C
D
E
F
G
H
1
2
3
4
5
6
• The numbers
1
to
17
are waveform numbers shown in page 19.
Figure 14 SCHEMATIC DIAGRAM (1/2)
COR1
C856
100P
C29
100P
R865
47K
D804
1N4148
1N4148
C75
100P
100P
C34
220P
C33
220P
220P
C5
0.1
0.1
COR801
BI801
BI802
C805
0.022
0.022
C806
330/10
330/10
R853
2.2K
R852
2.2K
C807
0.047
0.047
IC803
LA6541D
30 29 28 27 26 25 24 23 22 21 20
19 18 17 16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
R851
2.2K
2.2K
R76
820
820
L51
100
100
µ
H
C54
0.022
R13
10K
10K
R18
100
100
C68
220P
R77
3.3K
R17
47K
47K
R14
2.2K
2.2K
C58 100P
C57 100P
C18 0.001
R20
470
470
R879
4.7K
D806
1N4148
1N4148
R862
47K
47K
1
R861
10K
10K
CF4
R854
100
100
C12
1/50
1/50
R8
1K
1K
R58
1K
R15
39K
39K
R71
4.7K
4.7K
R74
3.3K
3.3K
R73
3.3K
3.3K
C26
0.1
C23
10/16
10/16
C7
0.001
0.001
R4
10
10
L2
R845
22K
22K
R866
3.3K
3.3K
D802
1N4148
1N4148
C245
1/50
C243
330P
C244
330P
R242
10K
10K
R241
10K
10K
C242
1/50
1/50
C241
1/50
1/50
R240
2.2K
2.2K
R239
2.2K
2.2K
R238
2.7K
2.7K
C224
0.1/50
C223
0.1/50
R237
2.7K
2.7K
R236
47K
R235
47K
R233
2.2K
2.2K
R234
2.2K
2.2K
SW201-C
SW201-B
C9
0.022
C10
8P
L803
220
220
µ
H
R850
1.5K
1.5K
1
R249
220
220
C74
1/50
1/50
R72
4.7K
4.7K
C825
47/16
47/16
C247
220/10
R247
560
R248
560
R246
5.6K
5.6K
R244
560K
560K
R243
560K
560K
R245
5.6K
5.6K
R51
150
150
C61
100/10
100/10
C73
1/50
1/50
R54
10K
10K
R354
4.7
4.7
R353
33K
33K
C353
0.0056
(ML)
0.0056
(ML)
R352
150
150
C354
0.022(ML)
0.022(ML)
C352
100/10
100/10
R351
100
100
R126
100
100
L301
C351
0.0022(ML)
R124
3.3K
R123
3.3K
R121
2.7K
2.7K
R122
2.7K
2.7K
X51
4.5MHz
4.5MHz
R456
15K
15K
R458
1K
1K
R457
1K
1K
R455
15K
15K
R62
1K
R61
1K
R60
1K
R59
1K
C60
0.0022
C59
0.01
C55
2.2/50
2.2/50
R53
4.7K
R52
2.2K
2.2K
C53
100/10
TC1
R8
220K
C11
360P
360P
VD3
KV1520NT
C25
0.047
0.047
F1
C27
0.001
C8
0.001
0.001
R6
15K
15K
R2
3.3K
C24
0.1
C19
2.2/50
2.2/50
R12
10
R7
10K
10K
VD2
KV1370NT
R5
22K
C6
22P(CH)
C32
0.1
0.1
R1
100K
C3
0.01
0.01
L1
C2
0.001
0.001
VD1
KV1370NT
R3
100K
C1
15P(CH)
C830
0.01(ML)
0.01(ML)
C828
0.0027
0.0027
C829
0.0047
0.0047
R832
3.3K
3.3K
C827
0.015(M
0.015(M
R827
15K
15K
C835
470P
470P
R831
3.3K
3.3K
R830
10K
10K
R829
3.3K
3.3K
R812
1K
1K
R834
3.3K
3.3K
C833
0.033(ML)
0.033(ML)
R833
3.3K
3.3K
C854
0.0068
0.0068
IC801
TA2109F
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
C819
0.1(ML)
0.1(ML)
R802
2.2K
2.2K
C818
56P
56P
C822
0.047
0.047
C863
47/16
47/16
C841
0.047
0.047
C842
0.047
0.047
C843
47/16
47/16
C826
47P
47P
R826
220K
D1
1N4148
1N4148
R16
3.3K
C22
1/50
C14
0.047
0.047
C71
0.018(ML)
C72
0.018
(ML)
C16
4.7/50
CF1
CF3
T3
C15
220/10
R10
330
C13
0.47/50
IC1
24
23 22 21
20
19 18 17 16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
C21
10/16
10/16
C20
330P
C51
15P
(CH)
15P
(CH)
C52
12P
(CH)
12P
(CH)
IC51 LC72121
22
21
20
19
18
17
16
15
14
13
12
11 10 9 8
7 6 5 4 3 2 1
R55
56K
56K
C56
0.022
C821
100/10
100/10
R806
2.7K
2.7K
R807
1K
1K
C801
0.01
0.01
R805
39K
39K
C820
0.1(ML)
0.1(ML)
R811
22K
C804
2P(CH)
R803
82K
82K
C813
47/16
47/16
C814
0.047
0.047
R804
68K
68K
D101
1N4148
R110
120
120
R115
3.9K
3.9K
C118
10/16
10/16
R125
680K
680K
R104
12K
12K
R103
12K
12K
C121
0.01
C113
47/16
47/16
C110
270P
270P
R114
8.2K
8.2K
R113
8.2K
8.2K
C119
2.2/50
C105
0.0018
0.0018
R101
330
330
R120
3.3K
R105
15K
15K
C112
330P
330P
R116
3.9K
3.9K
C116
0.018
(ML)
0.018
(ML)
R106
15K
15K
C106
0.0018
0.0018
C122
0.01
R119
3.3K
R118
3.9K
3.9K
CNP101
R102
330
330
C117
10/16
D102
1N4148
C115
0.018(ML)
0.018(ML)
C111
330P
330P
C108
820P
820P
R117
3.9K
3.9K
C120
47/16
C123
220/10
220/10
C114
47/16
47/16
C109
270P
270P
C107
820P
820P
R109
120
120
IC101
BA3311L
BA3311L
12
11
10
9
8
7
6
5
4
3
2
1
C817
100/10
C816
0.022
0.022
C815
47/16
47/16
BI803
C802
0.022
0.022
R820
47K
X801
16.93MHz
C838
0.047(ML)
0.047(ML)
C839
0.047(ML)
0.047(ML)
C834
470P
470P
C836
0.047(ML)
0.047(ML)
C845
0.047
0.047
C837
0.047(ML)
0.047(ML)
R828
10K
10K
R801
22
22
C832
47/16
47/16
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
Speaker Case
MONO/
ST
FM/AM
BO1
PD
VSSD
BO4
BO3
BO2
DO
CL
VSSA
VCO
FM/AM
IND
ST
OUT
AM IF
IF
MIX
FM RF
R-CH
L-CH
FM DET
AM IF
FM OSC
FM RF
MPX
IN
DET
OSC
OUT
IN
AM
OSC
FM
AM RF
OSC
IN
GND
AM LOW
CUT
OUT
VCC
IN
FM IF
AGC
GND
LPF2
LPF1
REQ
RF
OUT
VCC
FM RF
FM RF
IN
QUAD
TU
CD
AOUT
IO2
IFIN
AMIN
FMIN
AIN
VDD
IO1
DI
CE
XIN
XOUT
CD
R-CH
L-CH
TRO
FOO
DMO
FMO
VCC
VREF
CD
RES
REG IN
REG OUT
VIN4
VIN3
VIN2
GND
GND
7.5V
GND
GND
GND
VG4
VG3
VG2
VO4-
VO4+
VO3-
VO3+
VO2+
VO2-
VO1-
VO1+
VG1
VIN1
MT
VCC
SW810
OPEN/CLOSE
CD LID
CNS802
CNS801
CNS803
R-CH(CD)
L-CH(CD)
GND(AUDIO)
+7.5V(CD)
CNP803
FM
ROD
ANTENNA
ROD
ANTENNA
-
+
SW601
TAPE
MAIN
TAPE
MAIN
M601
TAPE
MOTOR
TAPE
MOTOR
ALC T
FILTER
VCC
GND
NF1
NF2
IN2
IN1
OUT2
OUT1
R
P
R
P
P
R
P
P
P
R
R
R
R
PRE AMP
TA
TU
TA
P
M702
SPINDLE
MOTOR
SPINDLE
MOTOR
M701
SLED
MOTOR
SLED
MOTOR
SW702
PICKUP IN
PICKUP IN
+
+
-
-
SP+
SP-
SL+
SL-
PU-IN
LD
K
E
E
K
LD
VR
PD
G
B
B
A
F
F
C
TR+
TR-
FO+
FO-
R-
R+
2200P
2200P
CD MOTOR PWB-B
FC-
FC+
TR-
TR+
GND
GND
K
F
B
E
A
VCC
FNI
FPI
TPI
TNI
MDI
LDO
SEL
TEB
2VRO
TEN
TEO
RFN
GND
RFO
AGCI
RFGC
RFGO
RFIS
RFRP
VRO
FEN
FEO
SBAD
MON
1M
1M
LTOH30P1
SLT-
SLT+
FM-
FM+
DM-
DM+
8
7
6
5
4
6
7
8
8
3
2
1
4
3
2
1
5
4
3
2
1
8
7
6
5
2
4
3
2
2
1
5
1
3
2
3
4
5
1
5
4
4
11
14
13
12
12
10
7
8
9
9
M
12
2
1
3
2
1
3
TA2104BN
4
3
1
2
9
13
22
M
M
1
2
3
4
5
6
SW102-D
SW102-H
SW102-E
SW102-A
SW102-F
SW102-G
SW102-B
SW102
RECORD/
PLAYBACK
RECORD/
PLAYBACK
A
PICK-UP UNIT
LD
VR
PD
F+
F-
1
2
3
4
5
6
1
2
3
4
5
6
SW102-C
8 7
P
6 5 4
16 17 18
3 2 1
Q801
KTA1266 GR
KTA1266 GR
L3
AM BAR ANTENNA
FM BAND
PASS
FILTER
2 3
1
SW102
RECORD/
PLAYBACK
RECORD/
PLAYBACK
19 20 21
14 15
23 24
Q1
KTC3199 GR
KTC3199 GR
R
Q351
KTC3199 GR
KTC3199 GR
11 10
Q210
KTC3199 GR
KTC3199 GR
Q209
KTC3199 GR
KTC3199 GR
VSSX
1
2
3
Q803
KRC107 M
KRC107 M
2
3
Q802
KTA1273 Y
KTA1273 Y
Q806
KTA1273 Y
KTA1273 Y
Q805
KRC107 M
KRC107 M
2
3
Q804
KTA12
SWITC
KTA12
SWITC
Q2
KRA102 M
TUNER
SWITHCING
Q211
KTC3199 GR
Q212
KTC3199 GR
4.4V
1.9V
1.9V
0.5V
0.5V
0V
3.8V
0V
0V
3.7V
1.9V
1.9V
0.8V
1.9V
1.9V
1.9V
0.9V
1.9V
1.9V
0.5V
1.9V
0.1V
GND
1.9V
VCC
1.9V
1.9V
3.4V
3.4V
GND
GND
GND
3.4V
3.4V
1.9V
1.9V
1.9V
1.9V
3.4V
3.4V
3.4V
3.4V
1.9V
1.9V
7.5V
LASER DRIVER
4.4V(ON:2.8V)
1.4V(ON:1.9V)
3.7V(ON:2.1V)
SWITCHING
7.5V
7.5V(TUN:0V)
6.9V
(TUN:7.5V)
GND
SWITCHING
0V
(TUN:7.5V)
4.5V
(TUN:
0.5V)
50
V
4.4V
GND
0V
(TUN:7.5V)
(TUN:7.5V)
4.4V
SWITCHING
5.0V
5.0V
(TUN:0V)
4.3V
(TUN:5.0V)
SWITCHING
IC801
SERVO PRE AMP.
TA2109F
8
9
10
IC803
FOCUS/
TRACKING/
SPIN/
SLED DRIVER
LA6541D
2
3
AM BAND
COVERAGE fL
COVERAGE fL
FM BAND
COVERAGE fL L2
COVERAGE fL L2
9
8
7
6
5
4
3
2
1
12
11
10
PIN
NO.
VOLTAGE
IC1
GND
0.8V(0V)
0.V
3.5V(4.1V)
3.7V(4.1V)
3.2V(4.1V)
3.7V(4.1V)
GND
0.4V(0.1V)
3.0V(3.6V)
1.2V
1.2V
0.8V(0V)
0.V
3.5V(4.1V)
3.7V(4.1V)
3.2V(4.1V)
3.7V(4.1V)
GND
0.4V(0.1V)
3.0V(3.6V)
1.2V
1.2V
21
20
19
18
17
16
15
14
13
24
23
22
PIN
NO.
VOLTAGE
2.9V(0V)
3.1V
0.7V
1.0V
0.9V
5.0V
3.6V(4.0V)
3.7V(4.1V)
3.7V(4.1V)
3.7V(4.1V)
3.7V(4.1V)
3.7V(4.1V)
3.1V
0.7V
1.0V
0.9V
5.0V
3.6V(4.0V)
3.7V(4.1V)
3.7V(4.1V)
3.7V(4.1V)
3.7V(4.1V)
3.7V(4.1V)
( ): AM
CNS101
L-CH
R-CH
ERASE HEAD
4
3
2
1
RECORD/
PLAYBACK HEAD
PLAYBACK HEAD
TAPE
IC51
LC72121
ELECTRONIC
TUNING
LC72121
ELECTRONIC
TUNING
IC1
FM/AM IF MPX.,
TA2104BN
FM/AM IF MPX.,
TA2104BN
IC101
REC./P.B.EQUALIZER AMP.
BA3311L
REC./P.B.EQUALIZER AMP.
BA3311L
L4
AM OSC.
AM TRACKING fL
AM TRACKING fH
AM IF
FM IF
0.6V
0V
0V
0.6V
3.2V
3.1V
7.3V
7.3V
0V
VOLTAGE:
PLAY and REC.
PLAY and REC.
SW102
RECORD/
PLAYBACK
RECORD/
PLAYBACK
SW102
RECORD/
PLAYBACK
RECORD/
PLAYBACK
SW102
RECORD/
PLAYBACK
RECORD/
PLAYBACK
SW201
FUNCTION
SELECTOR
FUNCTION
SELECTOR
BIAS OSC.
SW102
RECORD/
PLAYBACK
RECORD/
PLAYBACK
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
9
8
7
6
5
4
3
2
1
12
11
10
PIN
NO.
IC51
1.6V
GND
0.V
0V
0V
4.9V
-
3.1V
2.9V
0V
5.0V
0V
0.9V
GND
0V
1.5V
3.2V
0.9V
0.9V
1.7V
GND
1.6V
GND
0.V
0V
0V
4.9V
-
3.1V
2.9V
0V
5.0V
0V
0.9V
GND
0V
1.5V
3.2V
0.9V
0.9V
1.7V
GND
1.6V
21
20
19
18
17
16
15
14
13
22
VOLTAGE
FM ST
FM MONO AM
1.6V
GND
0.V
0V
0V
4.9V
-
0V
2.9V
0V
5.0V
0V
0.9V
GND
0V
1.5V
3.2V
0.9V
0.9V
1.7V
GND
1.6V
1.6V
GND
0.V
0V
0V
4.9V
-
0V
2.9V
0V
5.0V
0V
0.9V
GND
0V
1.5V
3.2V
0.9V
0.9V
1.7V
GND
1.6V
2V
GND
0.V
0V
0V
4.9V
-
0.7V
0V
0V
5.0V
0V
0.9V
GND
2.0V
0V
4.2V
0.9V
0.9V
1.0V
GND
2.0V
GND
0.V
0V
0V
4.9V
-
0.7V
0V
0V
5.0V
0V
0.9V
GND
2.0V
0V
4.2V
0.9V
0.9V
1.0V
GND
2.0V
0V
GND
0V
5.0V
5.0V
(CD: 0.4V)
(CD: 0.4V)
GND
(CD: OPEN)
TUNER
MUTE
MUTE
0V
0V
(REC: 4.0V)
0V
(REC: 0.4V)
(REC: 0.4V)
BIAS OSC.
0V
GND
0V(OFF:0.6V)
0V(OFF:0.6V)
0V
GND
0.2V
0.2V
2.0V
2.0V
0.8V
0.8V
Q209,Q210
X-BASS ON/OFF
X-BASS ON/OFF
Q211,Q212
LINE AMP
LINE AMP
L107
CHOKE
COIL
CHOKE
COIL
L108
CHOKE
COIL
CHOKE
COIL
D807
1N4148
1N4148
L807
0.82
0.82
µ
H
CF2 2
1
3
FM IF
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