DVD-LS837EEK - Panasonic DVD Service Manual (repair manual). Page 16

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Make sure that the traverse assembly removed before trying to
remove the optical pick-up unit.
When removing the traverse assembly, solder the one laser
short land on the flexible cable of the optical pick-up unit.

1. Remove the two screws securing the main shaft retainer.
2. Remove the main shaft retainer.
3. Slide the main shaft in the direction indicated by the arrow

to remove the optical pick-up unit.

The optical pick-up unit is factory adjusted. Do not touch the
adjustment screw.

1. Reassemble the disassembled parts in the reverse order

of disassembly.

2. When reinstalling the traverse assembly on the main unit

after installing the optical pick-up unit, make sure to
remove the solder from each of the two laser short lands
on the flexible cable.

• Remove the solders completely; otherwise the laser diode

won't emit light.

• After replacing the optical pick-up unit, check the quality of

images played back and make optical adjustment.

1. Remove the adjustment screws A, B, and C.
2. Remove the disc motor.

1. The mounting screws of the disc motor also serve as

adjustment screws. When reinstalling the disc motor, first
turn the screws A, B, and C as far as they go by usual
force to secure them (do not overtighten).

2. Back off the adjustment screws A and C two complete

turns and secure them.

3. Back off the adjustment screw B one and a half turns and

secure them.

• This makes it nearly possible to play back disks and

adjust the jitter.
Thereafter, adjust the adjustment screws C and A as
indicated.