Electrical Adjustments - Mitsubishi Electric WD-57831 Service Manual

73" Vertical Keystone Adjustment
1) Loosen locking screws (D) through (J).
2) Adjust (A) for minimum vertical keystone
distortion.
73"Horizontal Keystone Adjustment
1) Loosen locking screws (D) through (J).
2) Adjust (B) for minimum horizontal keystone
distortion.
After adjustment...
Tighten the locking screw in the following order D-E-F-G-H-I-J.
NOTE: If the picture position shifts during mechanical adjustments perform the following positioning
adjustments.

Electrical Adjustments

[Format Circuit]
Horizont/Vertical Position
Adjustment
Measuring
Test Point
----
------
Ext. Trigger
Measuring
------
Input Signal
Internal Test Patern.
Input Termi-
Video
MODEL: WD-57831 / WD-65831 / WD-73831
Purpose:
To center the picture on the screen.
Symptom:
Picture is off center.
1. Press "MENU-2-4-5-7", activates the Service Mode..
2. Select the "FORMAT" function (AUDIO button).
3. Press "REWIND", activates the Overscan Test Pattern
4. Select "Item 1" HPOS (VIDEO button).
5. Use the ADJUST buttons to center the picture horizontally.
6. Press ENTER to save the new setting.
7. Select "Item 2" VPOS (VIDEO button).
8. Use the ADJUST buttons to center the picture vertically.
9. Press ENTER to save the new setting.
10. Press MENU to exit the Service Mode.
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