Sharp MD-X7H Service Manual page 52

MD-X8H
CD TEST MODE
CD test mode setting
Any one of test mode can be set by pressing several buttons as follows.
Holding down CD PLAY/PAUSE and TACK UP/CUE, turn on POWER. TEST: CD operation test
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 (
<MEMORY>
LASER ON
<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 (
VOL: Last memory
BAL: CENTER
R.GEQ: FLAT
X-BASS.OFF
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. 16-1)
2. Tracking Offset (Fig. 16-2)
3. E/F Balance (Tracking Error Balance) (Fig. 16-3)
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 16-2
) or ( ) button.
<MEMORY>
Tracking on the spot.
SERVO OFF PLAY
Stop
<Disc Number 1> button: Track 4
<Disc Number 2> button: Track 9
<Disc Number 3> button: Track 15
Enlarged
View
TRACKING
OFF-SET
ADJUST
1
2
Initialization is not performed.
<MEMORY>
Tracking on the spot.
SERVO ON PLAY
) 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
– 16 –
<STOP>
STOP
Figure 16-1
Figure 16-3
FOCUS
OFF-SET
ADJUST
TRACKING
OFF-SET
ADJUST
1
2
TRACKING/
ERROR
BARANCE
1
ADJUST
2