Sharp MD-X5H User Manual

MD-X5H/CP-X5H
– 70 –
• Playback is enabled only when disc is loaded.
Is HF waveform normal? (See Figure 70-2 and Figure 70-3.)
Check the tracking system.
Does the focus servo operate? (Is operation audible?)
Check the laser diode driver.
Check the periphery from IC1 pin 16 to pin 21 (focus servo circuit).
No
Yes
Yes
Yes
Does DRF signal change from "L" to "H"?
No
Yes
Check the spindle system.
If disc is not rotating, DRF
must not change to "H".
No
• The CD operation button operates.
Check the FOCUS-HF system.
Playback is enabled without disc.
Does the pickup move up and down two times?
Yes
No
Focus search OK
Check the IC1 pin 50 (CLK) line, 4 MHz, and check
microcomputer dataon pin 51 (CL), pin 52 (DAT) and pin 53
(CE).
Yes
Is the output waveform of IC1 pin 16 (FD) identical with that
shown in Figure 70-1?
Yes
No
Check the IC5 to CNP2 and periphery.
Figure 70-1
0.5s
0.50 V
IC1 16 FD
2
1
0.5s
0.50 V
IC1 7 TE
Yes
Check the periphery of
IC1 pin 41 and pin 42.
Level error
Yes
Check the spindle system.
Waveform is unstable.
Figure 70-2
Figure 70-3
HF
1.0V/DIV
0.5µsec/DIV(DC)
(When playing
back the disc)
3
2
1
4
0.5s
1.00 V
IC1 16 FD
0.5s
10.0 V
IC2 13 CLV+
0.5s
10.0 V
IC1 54 DRF
0.5s
2.00 V
IC1 7 TE
Waveform in case of
normal play-back

Sharp MD-X5H Specifications

General

Brand	Sharp
Model	MD-X5H
Category	Stereo System
Language	English