Technical information

2.5.2.4.4 Geometry Adjustments
The test-pattern diskette provides menus for selecting the required test
patterns. The test for mode 4 gives patterns with a resolution of 1024 x
768 pixels (interlaced or non-interlaced, depending on the video source).
All adjustments must be made with the brightness control set at center
detent and the contrast control set at maximum. All test patterns should
be displayed in mode 4, or in the highest resolution mode supported.
CAUTION:
Only use the plastic end of the adjustment tool for these procedures.
Adjustments for unsupported modes are not required.
1. Select mode 4 (or mode 3 if mode 4 is not available).
2. Select option 3, pattern C (Full Screen Raster), and press the
spacebar to get a black screen.
3. Adjust RV508 (G2) until the background raster is just visible.
4. Adjust RV506 (H.CENT) until background is centered within the bezel.
5. Adjust RV508 until the background raster just disappears.
6. Press F3 to return to the setup patterns.
7. Select option 1, pattern A (Crosshatch).
8. Adjust the following controls to center the pattern horizontally
within the bezel.
+------------------------------------------------------------------------+
¦ Display ¦ Mode 4 ¦ Mode 3 ¦
+-----------------------+------------------------+-----------------------¦
¦ 8517 ¦ RV405 or RV404 ¦ RV403 ¦
+-----------------------+------------------------+-----------------------¦
¦ 9517 ¦ RV404 ¦ RV403 ¦
+------------------------------------------------------------------------+
9. Adjust RV204 (V.CENT) until the pattern is centered vertically within
the bezel.
10. Adjust the following width controls until the distance between each
vertical edge of the pattern and the bezel is:
7.5 mm ±0.5mm (mode 4) or
11 mm ±0.5mm (mode 3).
+------------------------------------------------------------------------+
¦ Display ¦ Mode 4 ¦ Mode 3 ¦
+-----------------------+------------------------+-----------------------¦
¦ 8517 ¦ RV356 or RV355 ¦ RV354 ¦
+-----------------------+------------------------+-----------------------¦
¦ 9517 ¦ RV356 ¦ RV354 ¦
+------------------------------------------------------------------------+
11. Adjust the following height controls until the distance between each
horizontal edge of the pattern and the bezel is:
7.5 mm ±0.5mm (mode 4) or
11 mm ±0.5mm (mode 3).
+------------------------------------------------------------------------+
¦ Display ¦ Mode 4 ¦ Mode 3 ¦
+-----------------------+------------------------+-----------------------¦
¦ 8517 ¦ RV215 or RV214 ¦ RV213 ¦
+-----------------------+------------------------+-----------------------¦
¦ 9517 ¦ RV215 ¦ RV213 ¦
+------------------------------------------------------------------------+
12. Adjust RV202 (V.LIN) until the distance between the top of the pattern
and the center point is the same as the distance between the bottom
line of the pattern and the center point.
13. Adjust RV307 (PIN.BAL) until the center vertical line of the pattern
is straight.
14. Adjust RV305 (S-CORE) until the vertical edges of the pattern are
straight.
15. Adjust the following pincushion controls until the vertical edges of
the pattern are straight.
PS/2 Displays Maintenance Manual
Geometry Adjustments
¦ Copyright IBM Corp. 1993
2.5.2.4.4 - 1