Panasonic SA-HT930GC, Service Manual

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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.
17.4. Optical adjustment
17.4.1. Optical pickup tilt adjustment
Measurement point Adjustment point Mode Disc
Tangential adjustment
screw
Tilt adjustment screw
T01 (inner periphery) play
T30 (center periphery)
T43 (outer periphery) play
DVDT-S20 [SPG]
Measuring equipment Adjustment value
None (Main unit display for servicing is used.) Adjust to the minimum jitter value.
17.4.1.1. Adjustment procedure
1. While pressing STOP button on the main unit, press "5" on the
remote control unit.
2. Confirm that "J_xxx/yyy_zz" (display1/display2) is shown on the
front display.
For your information:
"yyy" and "zz" shown to the right have nothing to do with the jitter value. "yyy" is the error
counter, while "zz" is the focus drive value.
Note:
Jitter value appears on the front display.
3. Play test disc T30 (center periphery).
4. Adjust tangential adjustment screw so that the jitter value is
minimized.
5. Play test disc T30 (center periphery).
6. Adjust tilt adjustment screw 1 so that the jitter value is minimized.
7. Play test disc T30 (center periphery).
8. Adjust tilt adjustment screw 2 so that the jitter value is minimized.
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