Denon DVD-3800 Service Manual page 4

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Note for Handling the Laser Pick-up
The protection for the damage of laser diode.
If you want to change the optical device unit from any other units, you must keep the following.
(1) It should be done at the desk already took measures the static electricity in care of removing the OPU's
(Optical device unit) connector cable.
(2) Workers should be put on the "Earth Band".
(3) It shold be done to add the solder to the short land to prevent the broken Laser diode before removing the
24P FFC cable.
(4) Don't touch OPU's connector parts carelessly.
Replacement of the Traverse Unit
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 initial 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.
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L 13942296513
 Laser drive current check
 HF signal check
Traverse Unit replacement (refer to page 8)
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.
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Present value: 50% up to initial value
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If the present value exceeds 80mA,
replace the Traverse Unit with a new one.
Cause: Damaged electrostatically when replaced.
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