JVC XV-521BK Service Manual page 17

Confirmation after adjustment.
Confirm to reproduce video CD and CD after
the DVD test disc is adjusted and to find abnormality.
(5) About keeping the disc
As for the DVD test disc, plane accuracy is demanded.Please note the keeping place on the disc.
1. Please do not put the disc directly on the work desk etc. after uses .
2.To keep the planarity of the disc, politely handle ,and please put in a special case and keep
the disc vertically after uses .
Please keep keeping the disc in a cool place where direct sunshine and the air-conditioning
wind do not drive.
3.When the disc curves,an accurate adjustment cannot be done.
Please exchange for a new test disc and adjust optics.
4 Other discs might not be able to be reproduced when adjusting on a curved disc.
Point of adjustment
* Please execute the static electricity protection measures before starting the
adjustment.
* When the following parts are exchanged,optical adjustment "Adjust the flap of the disc motor"
is necessary.
1.The disc motor was exchanged.
2.The laser pick up was exchanged.
3.The traverse motor unit was exchanged.
Note
Additionally, please adjust the flap of the disc motor when the picture quality deterioration is
seen .The basic adjustment though, is unnecessary for part exchange in the traverse.
An optical adjustment in the laser pick up cannot be done.
Please adjust the flap of the disc motor after exchanging the laser pick up.
* When the traverse unit is exchanged, the adjustment is basically unnecessary.
XV-521BK/523GD/525BK/421BK
A
A
B
Fig.2
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