Test Mode - Sharp CD-K477W Service Manual

CD-K477W

TEST MODE

• Setting the test mode
Any one of test mode can be set by pressing several keys as follows.
<REC. PAUSE> + <DISC. SKIP> + <POWER>
• TEST mode
Function — CD test mode
Setting of TEST mode
Indication of CD TST mode (Fig. 16-1)
OPEN/CLOSE operation is manual operation.
The pickup can be moved by using the (
<MEMORY>
<MEMORY>
LASER ON
Tracking on the spot.
SERVO OFF PLAY
<PLAY> key input
Note:
Only in STOP state it is possible to slide the pickup with the (
VOL. --- Last memory
BAL. --- CENTER
R.GEQ. --- FLAT
X-BAS --- OFF
Canceling method - POWER OFF
CD SECTION
Since this CD system incorporates the following automatic adjustment function, when the pickup is replaced, it is not necessary
to readjust it.
Since this CD unit does not need adjustment, the combination of PWB and laser pickup unit is not restricted.
• Automatic adjustment item
1. Focus offset (Fig. 16-2)
2. Tracking offset (Fig. 16-3)
3. E/F balance (tracking error balance) (Fig. 16-4)
4. RF 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.
0.1s
0.50 V
IC1 20 FE
0.1s
0.50 V
IC1 7 TE
Figure 16-2
200 ms
1V/diV
IC 1 15
TO
200 ms
1V/diV
IC 1 7
TE
Figure 16-4
TEST: CD operation test
) or ( ) key.
<MEMORY>
Tracking on the spot.
SERVO ON PLAY
TOC. IL is performed, and the ordinary PLAY is performed.
If the following key is pressed during PLAY, it is possible
to specify directly any Track No.
<Disc Number 1> key: Track 4
<Disc Number 2> key: Track 9
<Disc Number 3> key: Track 15
FOCUS
OFF-SET
ADJUST
TRACKING
OFF-SET
ADJUST
1
2
TRACKING/
ERROR
BARANCE
1 ADJUST
2
IL is not performed.
<STOP>
STOP
Press <STOP> key.
) or ( ) key.
Figure 16-1
10ms
0.50 V
IC1 20 FE
10ms
0.50 V
IC1 7 TE
– 16 –
Stop
Enlarged
View
TRACKING
OFF-SET
ADJUST
1
2
Figure 16-3