Sharp MD-X7H, Руководство по обслуживанию

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MD-X8H
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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 (
) or ( ) button.
<MEMORY> <MEMORY> <MEMORY> <STOP>
LASER ON Tracking on the spot. Tracking on the spot. STOP
SERVO OFF PLAY SERVO ON PLAY
<PLAY> button input - TOC. Initialization performed, and the ordinary PLAY is performed.
Press the <STOP> button.
Stop
If the following button is pressed during PLAY, it is possible to specify directly any Track No.
<Disc Number 1> button: Track 4
<Disc Number 2> button: Track 9
<Disc Number 3> button: Track 15
Note:
Only in STOP state it is possible to slide the pickup with the (
) or ( ) button.
VOL: Last memory
BAL: CENTER
R.GEQ: FLAT
X-BASS.OFF
Cancel method: POWER OFF
Initialization is not performed.
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.
Figure 16-1
Figure 16-2
Figure 16-3
2
0.1s
0.50 V
IC1 20 FE
0.1s
0.50 V
IC1 7 TE
1
FOCUS
OFF-SET
ADJUST
TRACKING
OFF-SET
ADJUST
2
1
10ms
0.50 V
IC1 20 FE
10ms
0.50 V
IC1 7 TE
Enlarged
View
TRACKING
OFF-SET
ADJUST
2
1
TO
TE
200 ms
1V/diV
IC 1 15
200 ms
1V/diV
IC 1 7
TRACKING/
ERROR
BARANCE
ADJUST