1.3 Basic Function Checks
Basic functions can be checked using the self-test raster.
Refer to "Alignment Procedures" in topic 2.0 when adjustments are required
after replacing components.
Refer to the IBM Personal System/2 8511 and 8518 Color Displays Hardware
Maintenance Reference for removal and replacement procedures.
+------------------------------------------------------------------------+
¦ Symptom ¦ Action ¦
+------------------------------------+-----------------------------------¦
¦ Any problems. ¦ First, check all connections and ¦
¦ ¦ plugs for continuity. ¦
+------------------------------------+-----------------------------------¦
¦ Green LED lit but test raster ¦ Adjust G2 control clockwise until ¦
¦ missing. ¦ test raster appears AGAINST ¦
¦ ¦ background raster. If no raster ¦
¦ ¦ appears, replace ITC. ¦
+------------------------------------+-----------------------------------¦
¦ Test raster is not white. ¦ Adjust gain controls for missing ¦
¦ ¦ colors. If colors reappear, ¦
¦ ¦ reset color point of ITC. ¦
¦ ¦ Otherwise replace ITC. ¦
+------------------------------------+-----------------------------------¦
¦ Background raster is not white. ¦ Adjust cutoff controls for ¦
¦ ¦ missing colors. If colors ¦
¦ ¦ reappear, reset color point of ¦
¦ ¦ ITC. Otherwise replace ITC. ¦
+------------------------------------+-----------------------------------¦
¦ Test raster scan is collapsed ¦ If partially collapsed, adjust as ¦
¦ horizontally or vertically. ¦ appropriate. If fully collapsed, ¦
¦ ¦ replace card tray assembly. ¦
+------------------------------------------------------------------------+
Note: The integrated tube component (ITC) includes the CRT, yoke
assembly, and associated components. The card tray assembly includes the
video, analog, control, and ac inlet cards.
IBM PS/2 8511 and 8518 Color Displays HMS
Basic Function Checks
¦ Copyright IBM Corp. 1992.
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