Optical Pick-Up Diagnostics And Replacement - Denon DVD-2900 Service Manual

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5. Optical Pick-up Diagnostics and Replace-
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ment
When repairing, carry out failure diagnostics by following the
procedure described below.
If the present value of the laser drive current is 50% up to ini-
tial value, it is the point of the pickup replacement.
In case of the pickup replacement, replace the Traverse Unit
with no adjustment.
The initial value is indicated on the label on back side of
Mecha.
NO DISC indicated, Playback not smooth,etc.
Laser drive current check
HF signal check
TE
L 13942296513
Traverse Unit replacement
(refer to page 6)
Laser drive current check after replacement.
If the present value is less than 80mA, write on
the new label by hand, put on the new label over
the old label.
If the present value exceeds 80mA, replace the Traverse Unit
a new one.
Cause: Damaged electrostatically when replaced.
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Present value
50% up to initial value
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