Cd Test Mode - Sharp MD-C2 Service Manual

CD TEST MODE

CD test mode setting
Any one of test mode can be set by pressing several buttons as follows.
Holding down CD DISC1 and
Test Mode
Function - CD TEST mode
Setting of Test mode
Indication of CD TEST mode
OPEN/CLOSE operation is manual operation.
The pickup can be moved with the (
<CD MD EDIT>
Tracking on the spot.
SERVO ON PLAY
<PLAY> button input - TOC. Initialization performed, and the ordinary PLAY is performed.
Press the <STOP> button.
If the following button is pressed during PLAY, it is possible to specify directly any Track No.
Note:
Only in STOP state it is possible to slide the pickup with the (
Cancel method: POWER OFF
CD SECTION
Since this CD system incorporates the following automatic adjusting function, when the pickup is replaced, it is not necessary
to the readjust it .
Since this CD unit does not need adjustment, the combination of PWB and laser pickup unit is not restricted.
Automatic adjustment items
1. Focus Offset (Fig. 19-1)
2. Tracking Offset (Fig. 19-2)
3. E/F Balance (Tracking Error Balance) (Fig. 19-3)
4. R/F level AGC function (HF level: Constant)
5. RF level automatic follow-up of the tracking gain
This automatic adjustment is performed each time a disc
is changed. Therefore, each disc is played back using
the optimal settings.
10ms
0.50 V
IC1 20 FE
10ms
0.50 V
IC1 7 TE
Figure 19-2
key, turn on POWER key.
) or ( ) button.
<PLAY MODE>
Tracking on the spot.
SERVO OFF PLAY
Stop
<CD Disc 1 PLAY> button: Track 4
<CD Disc 2 PLAY> button: Track 9
<CD Disc 3 PLAY> button: Track 15
Enlarged
View
TRACKING
OFF-SET
ADJUST
1
2
Initialization is not performed.
<CD-STOP>
STOP
) or ( ) button.
0.1s
0.50 V
IC1 20 FE
0.1s
0.50 V
IC1 7 TE
200 ms
1V/diV
IC 1 15
TO
200 ms
1V/diV
IC 1 7
TE
– 19 –
MD-C2
FOCUS
OFF-SET
ADJUST
TRACKING
OFF-SET
ADJUST
1
2
Figure 19-1
TRACKING/
ERROR
BARANCE
1
ADJUST
2
Figure 19-3