Read Sharp CD-C3H (serv.man12) Service Manual online
CD-C3H/CP-C3H
– 48 –
WAVEFORMS OF CD CIRCUIT
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
8
9
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
8
9
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
6
7
8
9
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
8
9
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+
10
11
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+
10
11
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
3
4
5
0.5ms
1.00 V
HF
1.00 V
HF
1
2
3
0.5ms
5.0 V
HFL
5.0 V
HFL
0.5ms
5.0 V
TES
5.0 V
TES
REVIEW
3
4
5
3
5ms
0.50 V
0.50 V
1
5ms
5.0 V
5.0 V
STOP
PLAY
FOCUS
SERCH
2
1
FE
DRF
PLAY
TCD-712
5ms
100mV
SLD
100mV
SLD
1
12
0.5ms
100mV
SLD
100mV
SLD
1
12
CD-C3H/CP-C3H
– 49 –
TROUBLESHOOTING
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.
• The CD tray fails to operate.
Check the changer mechanism cam switch (SWB101 to
SWB104) and tray switch (SWB105 to SWB108).
SWB104) and tray switch (SWB105 to SWB108).
Yes
Yes
Check the connection between IC201 and SW.
No
Check whether output of pins 3 and 7 of main cam motor
driver IC81 is normal.
driver IC81 is normal.
Check the connection from IC2 to IC81.
No
Yes
Check whether the output of pins 3 and 7 of tray motor
driver IC82 is normal.
driver IC82 is normal.
Yes
Check the motors MOB1 and MOB2.
No
Check the connection from IC2 to IC82.
Check whether state changes to Low when
IC201 pin 95 cam SW1
pin 96 cam SW2
pin 97 cam SW3
IC201 pin 95 cam SW1
pin 96 cam SW2
pin 97 cam SW3
pin 98 cam SW4
is on.
Check whether state changes to Low when
IC201 pin 33 tray SWA
pin 100 tray SWB
pin 1 tray SWC
pin 2 tray SWB
IC201 pin 33 tray SWA
pin 100 tray SWB
pin 1 tray SWC
pin 2 tray SWB
is on.
• The CD function will not work.
Yes
Yes
Check the waveform of SCK, SO (DATA) and SI (COMM).
Check the waveform of IC2 pin 54 (SQOUT), pin 55 (COIN),
and pin 56 (CQCK).
Check the waveform of IC2 pin 54 (SQOUT), pin 55 (COIN),
and pin 56 (CQCK).
Check the CD, DSP, power supply, and 16.93 MHz clock
and reset terminal IC2 pin 57.
and reset terminal IC2 pin 57.
Yes
Yes
If the items mentioned above are OK, check the main
microcomputer IC201.
microcomputer IC201.
Check that the pickup is in the PICKUP IN switch position
of SW702A.
of SW702A.
The CD operating keys don't work
CD-C3H/CP-C3H
– 50 –
• Playback can only be performed when disc is
loaded.
Is HF waveform normal (see the Figure 50-2, Figure 50-3.)?
Check the tracking system.
Is the Focus servo active? (Can you hear it working?)
Check the laser diode driver.
Check the area around IC1 pin 16 to pin 21 (focus servo
circuit).
Check the area around IC1 pin 16 to pin 21 (focus servo
circuit).
No
Yes
Yes
Yes
Does the DRF signal of IC1 pin 54 change from "L" to "H"?
No
Yes
Check the spindle system.
If the disc is not turning,
the DRF should not
change to "H".
the DRF should not
change to "H".
No
Yes
Check the periphery of
IC1 pin 41 and pin 42.
IC1 pin 41 and pin 42.
Level is abnormal
Yes
Check the spindle system.
Waveform is unstable.
Figure 50-2
Figure 50-3
• The CD operation keys work.
Check the FOCUS-HF system.
Playback can be performed without a disc.
Does the pickup move up and down two twice?
Yes
No
Focus search OK
Check 4 MHz of IC1 pin 50 (CLK) line and the microcomputer
data of pin 51 (CL), pin 52 (DAT) and pin 53 (CE).
data of pin 51 (CL), pin 52 (DAT) and pin 53 (CE).
Yes
Does the output waveform of IC1 pin 16 (FD) match that
shown in Figure 50-1?
shown in Figure 50-1?
Yes
No
Check the area around IC3 to CNP2.
Figure 50-1
0.5s
0.50 V
IC1 16 FD
0.50 V
IC1 16 FD
2
1
0.5s
0.50 V
IC1 7 TE
0.50 V
IC1 7 TE
HF
1.0V/DIV
0.5
1.0V/DIV
0.5
µ
sec/DIV(DC)
(When playing
back the disc)
back the disc)
Waveform in case
of normal play-back
of normal play-back
Focus search is
performed two times
when play operation
is done without disc.
performed two times
when play operation
is done without disc.
3
2
1
1
4
0.5s
1.00 V
IC1 16 FD
1.00 V
IC1 16 FD
0.5s
10.0 V
IC2 12 CLV+
10.0 V
IC2 12 CLV+
0.5s
10.0 V
IC1 54 DRF
10.0 V
IC1 54 DRF
0.5s
2.00 V
IC1 7 TE
2.00 V
IC1 7 TE
CD-C3H/CP-C3H
– 51 –
• Although HF waveform is normal and time
indication is normal, no sound is not output.
Check the IC2 pin 48 (EFLG).
Check the IC2 pin 37 and pin 40.
Check IC501 and POWER AMP. IC901.
Yes
Yes
No
Usually, the number of pulses of flawless disc is 100 pulses/sec
or less.
or less.
Data cannot be read.
Check the waveform of IC1 pin 7 (TE).
The waveform shown in Figure 51-1
appears, and no disc state appears
soon.
appears, and no disc state appears
soon.
Yes
Check the periphery of IC1 pin 8 to
pin 15, and IC3 to CNP2.
pin 15, and IC3 to CNP2.
Tracking servo is inoperative.
Yes
Yes
Playback is possible in TEST mode.
Yes
Normal jump is
impeded, and the
program top
cannot be
reached.
impeded, and the
program top
cannot be
reached.
Playback is impossible
although initialization
is possible.
although initialization
is possible.
Yes
Yes
Check the
periphery of IC1
pin 14.
periphery of IC1
pin 14.
Figure 51-1
3
4
5ms
1.00 V
IC1 7 TE
1.00 V
IC1 7 TE
5 ms
5.0 V
IC1 54 DRF
5.0 V
IC1 54 DRF
Yes
Yes
The turntable rotates a little.
The turntable fails to rotate or rotates at high speed.
The spindle driver is normal.
No
Play operation is performed when disc exists.
Yes
Although the HF waveform is normal, TOC data cannot be
read.
read.
No
Check the periphery of IC1 pin 23 to pin 27, pin 39, pin 40, IC2
pin 12, pin 13, from IC3 to CNP3.
pin 12, pin 13, from IC3 to CNP3.
No
Check the PDO waveform of IC2 pin 3. (Figure 51-2)
Check the IC1 pin 43, pin 44, IC2 pin 3, pin 5, pin 7, pin 10, and
pin 11.
pin 11.
Abnormal
Figure 51-2
Stop -- > Play
As VCO frequency is
locked at 4.32 MHz,
voltage of PDO rises
and stabilizes.
locked at 4.32 MHz,
voltage of PDO rises
and stabilizes.
2
3
0.5s
1.00 V
IC2 3 PDO
1.00 V
IC2 3 PDO
0.5s
1.00 V
IC1 16 FD
1.00 V
IC1 16 FD
