Optical Pickup Self-Diagnosis And Replacement Procedure - Yamaha DVD-C996 Service Manual

DVD-C996/DV-C6280

OPTICAL PICKUP SELF-DIAGNOSIS AND REPLACEMENT PROCEDURE

The optical pickup self-diagnosis function and tilt adjustment check function have been newly added to this player. When repair-
ing, 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 before the unit warms up (within three minutes).
• Use the self diagnosis function below
when "NO DISC" is displayed or unit
doesn't read a disc, before replacing
the OPU.
"NO DISC" is displayed,
unit does not play smoothly, etc.
Check the laser drive current.
Value is
55 or less
Replace the optical pickup
(Refer to Assembling and
Disassembling the Optical
Pickup, page 17.)
Check the laser drive
current after replacement.
• Write the present value into
the unit if it is 45 or less.
Do the optical pickup
tilt adjustment.
(Refer to Optical Pickup
Tilt Adjustment, page 23.)
Initialize the player.
Press the "PAUSE", "SKIP T"
and "PLAYXCHANGE" buttons
on unit simultaneously.
End
(Refer to Handling After
Completing Repairs, page 11.)
9
Value is
more than 55
Replace with a new optical pickup if the present
value is more than 45.
Cause:
Damage due to static electricity during replacement.
Use the tilt
adjustment
check function.
• Use the optical pickup self-diagnosis function.
Method: With no disc in the player.
• Press the "ON SCREEN" button on the
remote control unit while pressing the
"PAUSE" and "PLAYXCHANGE"
button on the player.
Display content
LD
Factory Present value
preset value
Method: With no disc in the player.
• Press the "ON SCREEN" button on the
remote control unit while pressing the
"PAUSE" and "PLAYXCHANGE"
button on the player.
• Write the present value into
the played if it is 45 or less.
Writing method:
• Press the "PAUSE" button on the remote
control unit while pressing the "PAUSE" and
"PLAYXCHANGE" button on the player.