Daewoo DN-W551, Service Manual

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Daewoo DN-W551 Service Manual
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1.2.2. Laser Caution
CAUTION
Adjusting the knobs, switches, and controls, etc. or taking actions not
specified herein may result in a harmful emission of laser beams. This
CD Changer must be adjusted and repaired only by qualified service
personnel.
Laser symbol :
THIS IS COMPACT DISC PLAYER IS CLASSIFIED AS A CLASS 1 LASER PRODUCT.
THE LASS 1 LASER PRODUCT LABEL IS LOCATED ON THE REAR EXTERIOR.
1.3. Precautions
1.3.1. ESD Precautions in Repairing
1.3.1.1. Do not apply excessive pressure on the mechanical parts
(moving pares), including the Pickup Block, as extremely high
mechanical precision or required in these parts.
1.3.1.2. When soldering the microprocessor and signal processing IC’s,
use a ceramic soldering iron or a soldering iron whose metal part
is grounded since they are not resistant to static electricity.
1.3.1.3. When removing the solder or soldering the laser shorting lands
for the Pickup Block, use a ceramic soldering iron or a soldering
iron whose metal part is grounded since the laser diode or not
resistant to static electricity.
1.3.2. DVD Loading Unit Precautions when handling the Mechanism Block
1.3.2.1. Do not loosen any screws in the Pickup Block.
1.3.2.2. Do not adjust any screws in the Mechanism Block except for “Tilt