Denon ADV-700 Service Manual page 5

Optical Pick-up Diagnostics and Replacement
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.
 Laser drive current check
 HF signal check
Traverse Unit replacement (refer to page 9)
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.
Present value: 50% up to initial value
If the present value exceeds 80mA,
replace the Traverse Unit with a new one.
Cause: Damaged electrostatically when replaced.
ADV-700
5