CD-C420H - Sharp Audio Service Manual (repair manual). Page 11

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2

1

TO

TE

200 ms
1V/diV
IC 1   15

200 ms
1V/diV
IC 1    7

TRACKING/
ERROR
BARANCE
ADJUST

2

1

10ms
0.50 V
IC1  20   FE

10ms
0.50 V
IC1  7   TE

Enlarged
View

TRACKING
OFF-SET
ADJUST

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. 11-2)
2. Tracking offset (Fig. 11-3)
3. E/F balance (tracking error balance) (Fig. 11-4)
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.

Only in STOP state it is possible to slide the pickup with the (

) or (

) key.

VOL. --- Last memory
BAL. --- CENTER
R.GEQ. --- FLAT
X-BAS --- OFF

Canceling method -  POWER OFF

• Setting the test mode
Any one of test mode can be set by pressing several keys as follows.
<REC. PAUSE> + <DISC. SKIP> + <POWER>     TEST: CD operation test
• TEST mode
Function — CD test mode

Setting of TEST mode

Indication of CD TST mode (Fig. 11-1)

OPEN/CLOSE operation is manual operation.

The pickup can be moved by using the (

) or (

) key.

<MEMORY>
LASER ON

<PLAY> key input

Press <STOP> key.

Stop

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

<MEMORY>
Tracking on the spot.
SERVO OFF PLAY

<MEMORY>

Tracking on the spot.
SERVO ON PLAY

STOP

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

IL is not performed.

<STOP>