Panasonic SA-HT920P Service Manual page 34

15 Adjustment Procedure
15.1 Service Tools and Equipment
Application
DVD test disc
Tilt adjustment
TORX screw driver (T6) Available on sales route. (T6) or RFKZ0185
Others Grease
CD test disc
Confirmation VCD test disc
Recovery disc
15.2 Important points in adjustment
15.2.1 Important points in optical adjustment
l Before starting optical adjustment, be sure to take anti-static measures.
l Optical pickup tilt adjustment is needed after replacement of the following components.
1. Optical pickup unit
2. Spindle motor unit
3. Optical pickup peripheral parts (such as rail)
Notes
Adjustment is generally unnecessary after replacing other parts of the traverse unit. However, make adjustment if there
is a noticeable degradation in picture quality. Optical adjustments cannot be made inside the optical pickup. Adjustment
is generally unnecessaryafter replacing the traverse unit.
15.2.2 Important points in electrical adjustment
Follow the adjustment procedures described in this Manual.
l
15.3 Storing and Handling Test Discs
l Surface precision is vital for DVD test discs. Be sure to store and handle them carefully.
1. Do not place discs directly onto the workbench, etc., after use.
2. Handle discs carefully in order to maintain their flatness. Place them into their case after use and store them
vertically. Store discs in a cool place where they are not exposed to direct sunlight or air from air conditioners.
3. Accurate adjustment will not be possible if the disc is warped when placed on a surface made of glass, etc. If this
happens, use a new test disc to make optical adjustments.
4. If adjustment is done using a warped disc, the adjustment will be incorrect and some discs will not be playable.
15.4 Optical adjustment
15.4.1 Optical pickup tilt adjustment
Measurement point
Tangential adjustment screw
Tilt adjustment screw
Measuring equipment
None (Main unit display for servicing is used.)
Name
DVDT-S15 or DVDT-S01
RFKXPG641
PVCD-K06 or any other commercially available disc
PVCD-K06 or any other commercially available disc
RFKZD03R005
Adjustment point
Number
Mode
T01 (inner periphery) play
T30 (center periphery)
T43 (outer periphery) play
Adjustment value
Adjust to the minimum jitter value.
Disc
DVDT-S15 or DVDT-S01