Denon DVM-4800 Service Manual page 5

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2. OPTICAL PICKUP SELF-DIAGNOSIS AND REPLACEMENT
PROCEDURE
2.1 Self-diagnosis
The optical pickup self-diagnosis function and tilt adjustment check function have been included in this unit. When repairing,
use the following procedure for effective Self-diagnosis and tilt adjustment. Be sure to use the self-diagnosis function before
replacing the optical pickup when "NO DISC" is displayed. As a guideline, you should replace the optical pickup when the
value of the laser drive current is more than 55.
Note:
Press the power button to turn on the power, and check the value within three minutes before the unit warms up.
(Otherwise, the result will be incorrect.)
Value is 70 (DVD),
55 (CD) or less
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"NO DISC" is displayed, unit does
not play smoothly, etc.
Check the laser drive current.
Value is more than
70 (DVD), 55 (CD)
Replace the optical pickup (Refer
to the section "OPTICAL PICKUP
REPLACEMENT PROCEDURE"
in this Guide.)
Check the laser drive current after
replacement.
Write the present value into the
unit if it is 60 (DVD), 45 (CD) or
less.
Do the optical pickup tilt adjust-
ment. (Refer to the section "TILT
ADJUSTMENT" in this Guide.)
Use the tilt
adjustment check
function.
Initialize the player.
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Use the optical pickup self-diagnosis function.
Method: With no disc in the player:
• Press the "DISPLAY" button on the
remote control unit while pressing the
"PAUSE" and "OPEN/CLOSE" buttons on
the player.
[Display content]
Factory setting Present value
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Replace with a new optical pickup if the present
value is more than 60 (DVD), 45 (CD).
Cause: Damage due to static electricity during
replacement.
Method: With no disc in the player:
• Press the "DISPLAY" button on the remote
control unit while pressing the "PAUSE" and
"OPEN/CLOSE" buttons on the player.
Write the present value
into the player if it is 45
or less.
Writing Method:
• Press the "PAUSE" button on the remote
control unit while pressing the "PAUSE" and
"OPEN/CLOSE" buttons on the player.
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