Daewoo DV-2500H, Service Manual

Page: 6 / 56

DV-2500H Service Manual
- 5 -
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 Adjust Screws”, as they are adjusted precisely at the
factory.
1.3.2.3. Replacement of the Pickup Block is impossible. Always
replace the Traverse Ass’y when the Pickup Block needed
to be replaced. Do not touch the lens or lens holder of the
Pickup Block.
1.3.2.4. The Guide Rails of the Pickup Block are greased. Take
care when handing.
1.3.2.5. When you try to slide the Pickup Block, do not press or pull
it directly. Always turn the dive gears with your fingers.
1.3.2.6. Be sure that the anti-slipping rubber on the turntable or
clean. If there is dust or it is greasy, clean the part with the
liquid that contains 50% each of alcohol and water.
1.3.2.7.
When removing the Mechanism P.C.B. Ass’y, you need to
short-circuit the laser diode shorting lands beforehand.