Sharp MD-C2 User Manual

MD-C2
– 70 –
• Check the tracking system.
Data cannot be read.
Check the waveform of IC1 pin 7 (TE).
The waveform shown in Figure 70-1
appears, and the disc condition is too
slow in being displayed.
Yes
Check the periphery of IC1 pin 8 to pin
15, and IC3 to CNP2.
Tracking servo is inoperative.
Check the VCO-PLL system.
Yes
Yes
Playback is possible in TEST mode.
Yes
Normal jump is
impeded, and the
program top cannot
be reached.
Playback is impossible
although initialization is
possible.
Yes
Yes
Check the periphery
of IC1 pin 14.
Figure 70-1
• Check the spindle system.
Yes
Yes
Is playback performed without a disc?
The turntable rotates a little.
The turntable fails to rotate or rotates at high speed.
The spindle driver is normal.
No
• Checking the VCO-PLL system.
Is playback performed with a disc?
Yes
Although the HF waveform is normal, TOC data cannot be
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.
No
Check the PDO waveform of IC2 pin 3. (Figure 70-2)
Check the IC1 pin 43, pin 44, IC2 pin 3, pin 5, pin 7, pin 9, and pin
10.
Abnormal
Figure 70-2
3
4
5ms
1.00 V
IC1 7 TE
5 ms
5.0 V
IC1 54 DRF
2
3
0.5s
1.00 V
IC2 3 PDO
0.5s
1.00 V
IC2 16 FD
Stop -- > Play
As VCO freque-
ncy is locked at
4.32 MHz, voltage
of PDD rises and
stabilizes.

Sharp MD-C2 Specifications

General

Brand	Sharp
Model	MD-C2
Category	Stereo System
Language	English