Sharp QT-CD50H (serv.man3) Service Manual ▷ View online
QT-CD50
Figure 5 ADJUSTMENT POINTS
– 5 –
Torque Meter
Specified Value
Play: TW-2412
Over 120 g
MECHANISM SECTION
• Driving Force Check
Torque Meter
Specified Value
• Torque Check
Play: TW-2111
25 to 65 g.cm
Fast forward: TW-2231
60 to 130 g.cm
Rewind: TW-2231
60 to 130 g.cm
• Head Azimuth
MTT-114
Output: Speaker Terminal
(Load resistance: 6
ohms)
ohms)
Test Tape
Instrument Connection
• Tape Speed
Instrument
Connection
Normal
MTT-111
3,000
±
Speaker
Speed
30 Hz
terminal
(Load
resistance:
6 ohms)
(Load
resistance:
6 ohms)
Specified Value
Test Tape
* Open the cassette holder, and load the test tape directly into
the mechanism. (Do not load the tape into the cassette
holder.)
holder.)
Torque Meter
Specified Value
Beat Cancel
A: 80 kHz + 10 kHz/-6kHz
B: -3
B: -3
±
1 kHz for A
C: -5
±
2 kHz for A
DECK SECTION
• Bias Oscillation Check
TUNER SECTION
fL: Low-range frequency
fH: High-renge frequency
fH: High-renge frequency
• VCO Frequency
Frequency
Adjusting
Parts
Frequency Display
Without modulation VR301
456 kHz
CT303
T303
T301
VR301
T302
CT302
CT304
CT301
L305
L307
L302
L306
FM IF
FM DETECTION
AM IF
VCO
AM
TRACKING
TRACKING
fL
fH
AM BAND
COVERAGE
COVERAGE
fL
fH
FM BAND
COVERAGE
COVERAGE
fH
fL
FM
TRACKING
TRACKING
fL
fH
IC301
1
8
9
11
16
TUNER PWB
• FM IF/RF
Specified Value/
Adjusting
Point
• AM IF/RF
Test Stage
Specified Value/
Adjusting
Point
IF
T302
Input: Antenna
Output: Pin 11 of IC301
Output: Pin 11 of IC301
Band
fL: L306
Input: Antenna
Coverage
fH: CT304
Output: Earphon Jack
Tracking
fL(526.5kHz): L302
(Load resistance:
fH(1,606.5 kHz): CT303
32 ohms)
Instrument
Connection
Test Stage
Instrument
Connection
IF
T301
Input: Pin 1 of IC301
Detection
T303
Output:Pin 11 of IC301
Band
fL: L307
Input: Antenna
Cverage
fH: CT302
Output: Earphon Jack
Tracking
fL(88.0 MHz): L305
(Load resistance:
fH(108.8 MHz): CT301
32 chms)
ADJUSTMENT
QT-CD50
Figure 6 WIRING OF P.W.BOARD (1/3)
– 6 –
A
B
C
D
E
F
G
H
1
2
3
4
5
6
CT304
CT302
CV304
CV302
CV303
CV301
CT303
CT301
M401
TAPE MOTOR
RECOD/PLAYBACK
HEAD (62)
ERASE
HEAD (63)
TAPE
SW401
TAPE MAIN
ROD ANTENNA(248)
(280)
WH
GR
RD
BL
BK
1
4
BR
WH
BK
RD
WH
BK
BR
GY
RD
WH
BK
RD
WH
BK
RD
BK
RD
GY
9
8
7
6
5
4
3
2
1
CNS573
RD
(284)
BK
WH
BR
VL
BK
BK
BK
RD
GY
RD
GY
WH
BK
RD
GY
4
3
2
3
2
CNS453
1
WH
RD
BK
BK
WH
BK
WH
TUNER PWB-B
DECK PWB-C
BEAT CUT PWB-F
L302
AM
BAR ANTENNA
SPEAKERS
R-CH
3 2 1
L-CH
SP2
SP1
CNS604
BR
BK
BK
YL
TAPE MECHANISM
GND
GND
(283)
R502
SW501
RECORD/
PLAYBACK
RECORD/
PLAYBACK
PLAY
REC
R501
R511
R544
A
1
3
B
C
D
E
F
G
H
I
9
1
R543
R520
R519
R521
R518
D598
R522
R512
C512
R514
R516
R598
R510
R509
R597
R504
C515
C516
C599
C542
C598
R596
R599
R541
R542
D501
R503
R505
R506
R517
C509
C513
C511
R513
R515
C503
C504
C508
C517 C518
C507
C514
C510
C501
C502
D599
IC501
C544
C541
C543
R704
R706
L701
C701
C702
C703
1
4
C704
C705
Q701
A
B
C
A
E
C
B
B
C
BEAT
CANCEL
SW701
CANCEL
SW701
R705
C706
R703
12 10 8 6 4 2
11 9 7 5 3 1
L306
R304
L305
1
2
3
2
3
3
2
1
2
1
6
1
IC302
D305
R305
9
8
7
6
5
4
3
2
1
C309
R303
T303
C327
T302
T301
L310
C326
C307
C362
C330
C331
C335
R319
R321
R353
R316
C336
R354
R352
R351
C339
C351
VR301
VCO
C334
C333
R356
R355
C355
C356
R317
C310
C306
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
C358
L307
R306
D303
C325
C311
C317
C314
R307
R309
R322
R318
C332
C352
C354
C353
R320
C359
C381
C313
R315
IC301
C319
CF302
CF301
R313
C322
C382
D301
D302
C318
D380
QT-CD50
Figure 7 WIRING OF P.W.BOARD (2/3)
– 7 –
7
8
9
10
11
12
SO801
AC POWER
SUPPLY SOCKET
AC120V 60Hz
J601
EARPHON
EARPHON
T801
POWER
TRANSFORMER
BK
RD
RD
BK
BK
RD
RD
YL
YL
2
1
CNS681
BK
VL
BR
WH
BK
RD
RD
BK
WH
RD
CNP402
TO CD SERVO PWB
P10 2-C
BK
WH
GY
RD
BK
BK
RD
BR
RD
BR
OR
YL
6
5
4
3
2
1
CNS463
BK
RD
BR
OR
OR
YL
GY
WH
BK
RD
BK
RD
POWER
CD
FM
AUTO
RADIO
AM
TAPE
FUNCTION
SW602
ON
OFF
POWER SUPPLY PWB-D
VOLUME PWB-H
B R
COLOR TABLE
R D ( R )
O R
Y L
G R
B L
V L
G Y
W H ( W )
B K
P K
BROWN
RED
ORANGE
YELLOW
GREEN
BLUE
VIOLET
GRAY
WHITE
BLACK
PINK
RD
BK
BK
WH
POWER AMP PWB-G1
EARPHONE PWB-G2
DC12V
["D"SIZE(UM/SUM-1,R20 or HP-2 battery)X8]
(273)
(249)
(250)
C802
C804
C803
C801
D801
D803
T1.25A L 250V
F801
D802
D804
CNP453
CNP462
R425
C417
C482
C483
C418
R426
5
1
1
2
3
1
9
1
2
3
4
5
6
7
8
6
4
R445
R448
R446
R464
R462
R461
D409
1
6
R443
C481
A
B
C
D
R409
VR402
VOLUME
B
A
C416
C415
R410
R442
C444
D402
SW402
X-BASS
X-BASS
ON
B
A
OFF
D405
D407
D406
D401
R463
C462
C461
D408
D403
C442
C443
R467
R444
R466
R465
SW602
POWER/FUNCTION
1 2 3
9
10
11
12
13
8
7
7
5
6
4
3
2
1
3
2
1
1
3
3
2
1
2
1
2
1
1
5
C612
C610
C609
C607
C608
C630
C626
C627
C628
Q601
C601
R601
D601
C605
C603
C604
IC601
C606
C611
C622
C602
Q602
R604
R621
R603
R602
IC602
CNP681
C621
CNP604
C629
R610
R609
6
5
4
3
2
1
6
5
4
3
2
1
B
E
C
E
B
C
QT-CD50
Figure 8 SCHEMATIC DIAGRAM (1/5)
– 8 –
A
B
C
D
E
F
G
H
1
2
3
4
5
6
NOTES ON SCHEMATIC DIAGRAM can be found on page 14.
(ML)
(ML)
(ML)
(CH)
(CH)
(ML)
(ML)
(ML)
(ML)
+B
POWER
/FUNCTION
ON-FM ST
ON-FM MONO
ON-CD
STAND-BY
-TAPE
/FUNCTION
POWER
ON-CD
ON-FM ST
ON-FM MONO
STAND-BY
-TAPE
SW602-B
SW602-A
RECORD
/PLAYBACK
/PLAYBACK
RECORD
/PLAYBACK
/PLAYBACK
R
P
R
P
220P
C517
RECORD
/PLAYBACK
/PLAYBACK
RECORD
/PLAYBACK
/PLAYBACK
CD SIGNAL
RECORD SIGNAL
PLAYBACK SIGNAL
AM SIGNAL
FM SIGNAL
10
R543
100
R704
A
B
C
BEAT CUT PWB-F
VOLUME PWB-H
DECK PWB-C
POWER AMP PWB-G1
RECORD
/PLAYBACK
RECORD/PLAYBACK
EQUALIZER AMP.
R
P
/PLAYBACK
RECORD
RECORD/PLAYBACK
470P
C508
+B
C483
0.039
(ML)
ON
OFF
ON
OFF
SW402B
X-BASS
SW402A
X-BASS
TO CD SER
P13 1
CNP
CNS463 6
6
4
5
R
P
R
P
R
P
R
P
R
P
R
P
15K
R501
47
R509
0.027
C511
1/10
C462
1/10
C461
BIAS OSC.
BIAS OSC.
100K
R512
47
R510
R-CH
L-CH
TAPE
ERASE HEAD
HEAD
/PLAYBACK
RECORD
15K
R464
15K
R463
1.8K
R462
1.8K
R461
100
R442
R522
2.2K
3.3K
R520
SW501-F
2.2K
R409
22K
R466
C482
0.039
(ML)
2.2K
R410
22K
R465
R521
2.2K
3.3K
R519
SW501-H
47/10
C509
3.9K
R517
100K
R513
100K
R511
SW501-D
5.6K
R515
1N4148
D599
3.3K
R599
0.01
C599
2.2/25
C513
470P
C507
BA3311L
IC501
1N4148
D598
3.3K
R596
C598
0.01
3.9K
R518
3
1
220P
C501
470P
C503
SW501-B
SW501-A
1K
R597
1.5K
R544
220P
C502
15K
R502
SW501-C
RECORD
/PLAYBACK
470P
C504
0.0027
C515
0.0027
C516
10K
R505
10K
R506
220
R504
220
R503
SW501-E
1K
R598
SW501-I
220
R542
SW501-G
1N4148
D501
100K
R514
7
6
6
0.027
C512
5.6K
R516
680K
R541
47/10
C541
1/10
C542
0.02
C544
100/10
C543
220P
C518
11
12
4
2
10
9
5
47/10
C510
2.2/25
C514
8
3
1
0.001
C705
0.0022
C706
8.2K
R703
100/10
C704
SW701
BEAT
CANCEL
120P
C702
250P
C701
0.001
C703
3.3
R706
8050 D
Q701
8.2K
R705
L701
4
1
4
1
FM B. P. F
AM BAR
+B
CV303
(CH)
CV304
(CH)
AM OSC.
(CH)
L306
ANTENNA
COVERAGE
FM RF
(RH)
FM FRONT END
(ML)
L305
FM OSC.
L307
+B
FM BAND
+B
fL
fH
COVERAGE
AM BAND
fL
fH
0.02
C317
0.04
C318
ROD
1N4148
D302
D301
1N4148
FM IF
AM IF
+B
+B
3
2
1
3
1
+B
2
FM D
IN
FM IF
IN
AM IF
VDD
AGC
QUAO
GND2
OUT
DET
OSC
AM
OSC
FM
SW
AM/FM
FM RF
OUT
IN
AM RF
AM MIX
IN
MIX
FM
GND1
FM RF
ANTENNA
L302
33/10
C327
AM IF
CF301
455kHz
TA8164P
IC301
CT303
35P(CH)
C326
L310
220P
C325
CT304
22K
R304
1N4148
D380
CV301
CT301
25P
C306
CV302
CT302
18P
C309
0.04
C314
1S2638
D303
100K
R306
4P
C311
150K
R307
33
R305
33P
C310
33
R303
0.001
C307
1K
R309
0.001
C313
T3
6.8K
R315
150
R313
FM IF
CF302
10.7MHz
CF302
10.7MHz
7
T302
T301
6
5
4
3
2
9
8
1
16
15
14
13
12
11
10
FM TRACKING
fL
fH
AM TRACKING
fL
fH
100P
C382
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