Mg Focus Adjustment For 31.5 Khz Signal - Sony VPH-G90U Service Manual

3-4-10. MG FOCUS Adjustment for 31.5 kHz
Signal
1. Set INPUT-A to the no-signal state, then select INPUT-
A.
Select the INT OSC PATTERN from INT. OSC menu
with the MENU key, then select P3 (fH = 31.5 kHz, fV
= 60 Hz).
2. Press the REGISTRATION CENT key and the ADJ G
key to set the CENT GREEN adjustment mode and
press the CUT OFF key and B key to set GREEN only.
3. Adjust the GREEN center to the screen center (When it
has been aligned, adjustment is not needed).
4. Press the REGISTRATION SIZE key to set the SIZE
adjustment mode, adjust the H.SIZE and V.SIZE again.
5. Press the PATTERN key to output the cross-hatch
pattern, and check that the image distortion has been
roughly adjusted. (If not, adjust it again).
6. Press the MG FOCUS key to set the MG Focus
adjustment mode, and press the PATTERN key several
times to output the ME pattern.
7. Adjust ALL FOCUS at "POSITION No. 1" so that the
ME pattern of the center can be focused in the optimum
condition.
8. Adjust the GREEN main lens to make the focus of the
central part optimum, then fix it.
9. Press the FUNCTION key to set to SPOT SHAPE ADJ
mode.
10. Press the PATTERN key to output the dot pattern.
Then press the POSITION (+) key to set to
"POSITION No. 2" mode.
11. Move the AQP adjustment mode with ↑ and ↓ keys,
then perform adjustment so that the dot can become
most rounded.
12. Move the DQP adjustment mode with ↑ and ↓ keys,
then perform adjustment so that the dot can become
most rounded.
13. Move the AHP adjustment mode with ↑ and ↓ keys,
then perform adjustment so that the dot can become
most rounded.
14. Move the DHP adjustment mode with ↑ and ↓ keys,
then perform adjustment so that the dot can become
most rounded.
15. Repeat Steps 11 to 14 several times to adjust the dot to
the most rounded conditions while adjusting the
tracking.
16. Press the FUNCTION key to finish the SPOT SHAPE
ADJ mode.
17. Press the PATTERN key several times to output the
ME pattern.
3-10
18. Press the POSITION (+) key to set to "POSITION No.
2" mode.
19. Press the MG FOCUS key and the ADJ G key.
20. Press the CUT OFF R key and B key to set GREEN
only on the screen.
21. Adjust the focus of the upper ME pattern to the
optimum.
22. Move the AQP adjustment mode with ↑ and ↓ keys,
adjust the focus of the upper ME pattern to the
optimum.
23. Move the DQP adjustment mode with ↑ and ↓ keys,
adjust the focus of the upper ME pattern to the
optimum.
24. Repeat Steps 21 to 23 several times to adjust the ME
pattern to the optimum while adjusting the tracking.
25. Press the POSITION (+) key to set to "POSITION No.
3" mode.
26. Adjust it in the same way as Steps 19 to 24.
27. Adjust "POSITION No. 4" to "POSITION No. 9" in
the same way as Steps 25 and 26.
28. Press the MEMORY key to save the adjustment data.
29. Perform the MG FOCUS adjustment of RED and
BLUE in the same way as GREEN.
30. Save the data after adjustment.
6
4
7
* The number in the figure indicates the POSITION during
AQP, DOP, AHP, and DHP adjustments.
2 8
1 5
3 9
VPH-G90E/G90U/G90M