Sharp QT-CD132H Service Manual ▷ View online
QT-CD131H/132H
– 21 –
NOTES ON SCHEMATIC DIAGRAM
1. Tuner
( ): AM mode
Marking except for ( ): FM mode
Marking except for ( ): FM mode
2. CD
( ): Play mode
Marking except for ( ): Stop state
Marking except for ( ): Stop state
3. Deck section
( ): Record mode
Marking except for ( ): Playback mode
Display / Control section:
( ): Active state
Marking except for ( ): CD Function mode at stop state
Marking except for ( ): Playback mode
Display / Control section:
( ): Active state
Marking except for ( ): CD Function mode at stop state
• Schematic diagram and Wiring Side of P.W.Board for this
model are subject to change for improvement without prior
notice.
notice.
• Parts marked with “ ” (
) are important for
maintaining the safety of the set. Be sure to replace these
parts with specified ones for maintaining the safety and
performance of the set.
parts with specified ones for maintaining the safety and
performance of the set.
• Resistor:
To differentiate the units of resistors, the symbol as K and M
are used: the symbol K means 1000 ohm and the symbol M
means 1000 kohm and the resistor without any symbol is an
ohm resistor. The resistor designated "Fusible" is a fuse type
resistor
are used: the symbol K means 1000 ohm and the symbol M
means 1000 kohm and the resistor without any symbol is an
ohm resistor. The resistor designated "Fusible" is a fuse type
resistor
• Capacitor:
To indicate the unit of capacitor, a symbol P is used: this
symbol P means micro-micro-farad and the unit of the capacitor
without such a symbol is microfarad. As to electrolytic capacitor,
the expression “capacitance/withstand voltage” is used.
(CH), (TH), (RH), (UJ): Temperature compensation
(ML): Mylar type
(P.P.): Polypropylene type
symbol P means micro-micro-farad and the unit of the capacitor
without such a symbol is microfarad. As to electrolytic capacitor,
the expression “capacitance/withstand voltage” is used.
(CH), (TH), (RH), (UJ): Temperature compensation
(ML): Mylar type
(P.P.): Polypropylene type
• The indicated voltage in each section is the one measured by
Digital Multimeter between such a section and the chassis
with no signal given.
with no signal given.
SW102
RECODE/PLAYBACK
OFF—ON
SW201
FUNCTION/POWER
TAPE—TUNER— CD/
OFF—ON
OFF—ON
SW202
SURROUND (132H ONLY)
OFF—ON
SW203
X-BASS
OFF—ON
SW501
BAND
OFF—ON
SW502
TUNER DOWN
OFF—ON
SW503
TUNER UP
OFF—ON
SW504
MEMORY
OFF—ON
REF. NO
DESCRIPTION
POSITION
SW505
PRESET UP
OFF—ON
SW506
PRESET DOWN
OFF—ON
SW601
TAPE MAIN
OFF—ON
SW702
PICKUP IN
OFF—ON
SW761
CD LID OPEN/CLOSE
OFF—ON
SW771
PLAY/REPEAT
OFF—ON
SW772
STOP
OFF—ON
SW773
TRACK UP/CUE
OFF—ON
SW774
TRACK DOWN/REVIEW
OFF—ON
Figure 21 TYPES OF TRANSISTOR
REF. NO
DESCRIPTION
POSITION
E C B
(S) (G) (D)
(1) (2) (3)
FRONT
VIEW
2SA673-C
2SC1815 GR
2SC1674 K
2SC1815 GR
2SC1674 K
E C B
FRONT
VIEW
S8050D
E B C
FRONT
VIEW
S9012H
QT-CD131H/132H
– 22 –
WAVEFORMS OF CD CIRCUIT
1
1
3
5ms
0.50 V
IC801 20 F.E
0.50 V
IC801 20 F.E
1
5ms
5.0 V
IC801 54 DRF
5.0 V
IC801 54 DRF
STOP
PLAY
FOCUS
SERCH
2
0.5ms
1.00 V
HF
1.00 V
HF
0.5ms
5.0 V
HFL
5.0 V
HFL
0.5ms
5.0 V
TES
5.0 V
TES
1
2
3
CUE
4
5
3
0.5ms
1.00 V
H.F
1.00 V
H.F
1
2
3
0.5ms
5.0 V
HFL
5.0 V
HFL
0.5ms
5.0 V
TES
5.0 V
TES
REVIEW
4
5
3
0.5ms
10.0 V
JP+
10.0 V
JP+
0.5ms
10.0 V
JP-
10.0 V
JP-
0.5ms
0.50 V
JP
0.50 V
JP
0.5ms
1.00 V
TE
1.00 V
TE
6
7
9
8
6
7
9
8
50ms
10.0 V
JP+
10.0 V
JP+
CUE
50ms
10.0 V
JP-
10.0 V
JP-
50ms
0.50 V
JP
0.50 V
JP
50ms
1.00 V
TE
1.00 V
TE
6
7
9
8
6
7
9
8
11
10
11
10
12
12
REVIEW
50ms
10.0 V
JP+
10.0 V
JP+
50ms
10.0 V
JP-
10.0 V
JP-
50ms
0.50 V
JP
0.50 V
JP
50ms
1.00 V
TE
1.00 V
TE
0.5ms
10.0 V
JP+
10.0 V
JP+
0.5ms
10.0 V
JP-
10.0 V
JP-
0.5ms
0.50 V
JP
0.50 V
JP
0.5ms
1.00 V
TE
1.00 V
TE
PLAY
20ms
1.00 V
SPO
1.00 V
SPO
NORMAL DISC
TN0=01
TN0=01
20ms
2.00 V
CLV+
2.00 V
CLV+
PLAY
TCD-712 (140mm)
TN0=01
TN0=01
50ms
1.00 V
SPO
1.00 V
SPO
50ms
2.00 V
CLV+
2.00 V
CLV+
PLAY
TCD-712
5s
100mV
SLD
100mV
SLD
1
0.5s
100mV
SLD
100mV
SLD
1
QT-CD131H/132H
– 23 –
TROUBLESHOOTING (CD SECTION)
When the CD does not function
When the CD section does not operate When the objective lens of the optical pickup is dirty,this section may not operate.Clean
the objective lens,and check the playback operation.When this section does not operate even after the above step is taken,check
the following items.
Remove the cabinet and follow the troubleshooting instructions.
"Track skipping and/or no TOC(Table Of Contents) may be caused by build up of dust other foreign matter on the laser pickup lens.
Before attempting any adjustment make certain that the lens is clean. If not, clean it as mentioned below."
the objective lens,and check the playback operation.When this section does not operate even after the above step is taken,check
the following items.
Remove the cabinet and follow the troubleshooting instructions.
"Track skipping and/or no TOC(Table Of Contents) may be caused by build up of dust other foreign matter on the laser pickup lens.
Before attempting any adjustment make certain that the lens is clean. If not, clean it as mentioned below."
Turn the power off.
Gently clean the lens with a lens cleaning tissue and a small amount of isopropyl alcohol.
Do not touch the lens with the bare hand.
Gently clean the lens with a lens cleaning tissue and a small amount of isopropyl alcohol.
Do not touch the lens with the bare hand.
See if the pick-up is in the pick-up in SW702 position.
If the items mentioned above are OK, check the main
microcomputer IC701.
microcomputer IC701.
Yes
Yes
• The CD function will not work.
The CD operating keys don't work.
Check the CD, DPS microcomputer (IC701), power supply, 4.19
MHz and 16.93 MHz clock, and reset terminal.
MHz and 16.93 MHz clock, and reset terminal.
Check the waveform of SCK, SO (DATA) and SI (COMM).
Yes
Yes
Playback can be performed without a disc.
Yes
Does the output waveform of IC801(16)(FD) match that shown in
Fig. 23?
Fig. 23?
Check the area around IC804-BI801/CNS801.
Yes
Check the IC801(50)(CLK) line, 4MHz.
Check the microcomputer data on pins (51)(CL), (52)(DAT) and
(53)CE.
Check the microcomputer data on pins (51)(CL), (52)(DAT) and
(53)CE.
Figure 23
• The CD operating keys work.
No
Yes
No
Does the pick-up move up and down twice?
Focus search OK.
Focus search
is performed
two times
when play
operation is
done without
disc.
is performed
two times
when play
operation is
done without
disc.
0.5s
0.50 V
IC801 16 FD
0.50 V
IC801 16 FD
2
1
0.5s
0.50 V
IC801 15 TD
0.50 V
IC801 15 TD
Check the Focus - HF system.
QT-CD131H/132H
– 24 –
Check the laser diode driver.
• Playback can only be performed when a disc
is loaded.
Does the DRF signal change from "L" to "H"?
No
If the disc is not turning, the DRF
should not change to "H".
should not change to "H".
Is HF waveform normal (see the Fig. 24-1, 2)?
Yes
Is the Focus servo active? (Can you hear it working?)
No
Check the area around IC801(16) - (21) (focus servo circuit).
L
evel is abnormal.
Check the periphery
of IC801 pins 41 and
42.
of IC801 pins 41 and
42.
No
Waveform is unstable.
Check the spin
system.
system.
Yes
Yes
Yes
Yes
Yes
Figure 24-2
Figure 24-1
Check the spin
system.
system.
HF
0.1V/DIV
0.5µsec/DIV(DC)
(When playing
back the disc)
0.1V/DIV
0.5µsec/DIV(DC)
(When playing
back the disc)
Waveform in case
of normal play-
back
of normal play-
back
3
2
1
1
4
0.5s
1.00 V
IC801 16 FD
1.00 V
IC801 16 FD
0.5s
10.0 V
IC801 12 CLV+
10.0 V
IC801 12 CLV+
0.5s
10.0 V
IC801 54 DRF
10.0 V
IC801 54 DRF
0.5s
2.00 V
IC801 7 TE
2.00 V
IC801 7 TE
Check the tracking system.
▼
▼
▼
• Check the tracking system.
Check waveform of IC801 pin 7 (TE).
Check the periphery of IC801
pin 8 to pin 15, and IC804 to
BI801/CNS801.
pin 8 to pin 15, and IC804 to
BI801/CNS801.
Tracking servo is inoperative.
The waveform shown in Fig. 24-3
appears, and no-disc state appears
soon.
appears, and no-disc state appears
soon.
Yes
Yes
Yes
Yes
Play is possible in
TEST mode.
TEST mode.
Although IL is possible,
play is impossible.
play is impossible.
Normal jump is impeded, and the
program top cannot be reached.
program top cannot be reached.
Check the periphery of
IC801 pin 14.
IC801 pin 14.
Yes
Data cannot be read.
Check the VCO-PLL system.
Yes
3
4
5ms
1.00 V
IC801 7 TE
1.00 V
IC801 7 TE
5 ms
5.0 V
IC801 54 DRF
5.0 V
IC801 54 DRF
Figure 24-3
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