Panasonic SA-PT170PH Service Manual page 29

6.2.5. Optical Pick-up 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 the specified value.
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.)
"NO DISC" is displayed, unit
does not play smoothly, etc.
Check the laser drive current.
Replace the traverse unit.
(Refer to the section "OPTICAL
PICKUP REPLACEMENT
PROCEDURE" in this Guide.)
Initialize the main unit.
Value is more than
37 (DVD), 41 (CD).
Use the optical pickup self-diagnosis function.
Method: With no disc in the main unit:
• Press the "FUNCTIONS" button on the remote
control unit while pressing the "STOP"
button on the main unit. (DVD)
•Press the "3" button on the remote
control unit while pressing the "STOP"
button on the main unit. (CD)
[Display content (display1/display2)]
/
LDD
Factory setting Present value
LDC /
Factory setting Present value
Replace with a new optical pickup if the present
value is more than 37 (DVD), 41 (CD).
Cause: Damage due to static electricity
during replacement.
29
(DVD)
(CD)