Diagnostics Of Optical Pickup And Replacing Traverse Unit - Denon DVD-2900 Service Manual

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DIAGNOSTICS OF OPTICAL PICKUP
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AND REPLACING TRAVERSE UNIT
Make failure diagnostics of the Optical Pickup as follows.
If the laser drive current becomes more than 1.5 times of the
initial value, the Optical Pickup should be replaced.
The laser drive current is registered on the seal attached to
the rear of the Mecha.Unit.
In case of replacing the Pickup, change the whole part of the
Traverse Unit.
No mechanical adjustment is necessary after the replace-
ment.
Disc no read,unsteady playback, etc.
TE
L 13942296513
Laser drive current check
HF wave form check
(Refer to page 109)
Present value exceeds the ini-
tial value by 1.5 times
Traverse Unit replacing
(See page 7 for details)
Laser current registering after replacement.
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Step: Disc playback
Write the measured value on the seal attached to the
.
Mecha. Unit
*As to the measuring method, refer to page 10,11.
http://www.xiaoyu163.com
Example: DVD 30mA
CD 30mA
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