Distructive Electro 'Static Discharge To Traverse Laser Pickup - Denon DVD-5000 Service Manual

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DISTRUCTIVE ELECTRO STATIC DISCHARGE (ESD) TO TRAVERSE LASER PICKUP
The laser diode in the traverse unit (laser pickup) may be damaged by static electricity charged in your cloth or body. Be careful
not to damage it by ESD when handling for servicing.
Handling of Traverse Unit (laser pickup)
1. Do not apply a strong shock to the traverse unit (laser
pickup) since it is made of precise structure.
2. To prevent the breakdown of the laser diode, install the
flexible cable after removing the short pin for preventing a
electrical charge. When removing or connecting the short
pin, finish the job in as short time as possible.
Also, cut out the short land of the flexible cable using nip-
pers and etc. after replacing the optical pickup. Refer to
"REPLACING THE MAIN PARTS OF THE TRAVERSE
UNIT" in this manual for the handling of the traverse unit.
3. Be careful not to apply excessive stress to the flexible board
(FPC Board) since it may cause cutting.
4. Do not turn the variable resistor of the laser power since it
is not adjustable.
Grounding for electrostatic breakdown
prevention
1. Human body grounding
Use an anti-static wrist strap to discharge the static elec-
tricity from your body.
2. Work table grounding
Put a conductive materiai (sheet) or steel sheet on the area
where the optical pickup is placed and ground the sheet.
3. When replacing DVD drive unit
Because the unit wrapping bag (blue polyethylene bag)
may be charged electro-statically, be sure to unwrap the
DVD drive unit on the work table when preparing the unit
for replacement.
4. Power source
In the state of drive unit alone, the laser diode may be
damaged by the spike current or voltage generated by
power on/off of other equipment (electric tolls or fluores-
cent light stand etc.)
Provide separate power source for using such equipment.
SETTING ON SHIPPING
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DVD
Elevation up position (Standby)
Method
At power ON:
Handling of Laser Diode
1. Do not use a tester or etc. for checking the laser diode
since the laser diode may be damaged easily by the volt-
age of the tester inside battery.
Wirst strap
(Anti-static bracelet)
MQ
Iron plate or some metals
to conduct electricity
Setting position
1. Close the tray with the CLOSE button.
Traverse position
2. Turn the power off with the POWER button.
3. Disconnect the power plug from the power outlet.
Caution
Do not close the tray in manual after disconnecting the power plug from the power outlet.
If do it, the traverse is not set to the elevation up position (standby) and you can
not transport the unit.
Initializing of Microcomputer
To initialize the microcomputer (Factory shipping condition), press the OPEN/CLOSE
button during pressing both PLAY and SKIP(i<4< ) buttons.