Technical information
2.7.2.1 Function Checks
Basic functions can be checked using the self-test raster.
Refer to "Adjustment Procedures" in topic 2.7.2.3 when adjustments are
required.
Refer to the "Display-Specific Removals and Replacements" in topic 2.7.1
for removal and replacement procedures.
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¦ Symptom ¦ Action ¦
+-----------------------+------------------------------------------------¦
¦ Any problems. ¦ First, check all connections and plugs for ¦
¦ ¦ continuity. ¦
+-----------------------+------------------------------------------------¦
¦ Green LED lit but ¦ Adjust G2 control clockwise until test raster ¦
¦ test raster missing. ¦ appears AGAINST background raster. If no ¦
¦ ¦ raster appears, replace ITC. ¦
+-----------------------+------------------------------------------------¦
¦ Test raster is not ¦ Adjust gain controls for missing colors. If ¦
¦ white. ¦ colors reappear, reset color point of ITC. ¦
¦ ¦ Otherwise replace ITC. ¦
+-----------------------+------------------------------------------------¦
¦ Background raster is ¦ Adjust cutoff controls for missing colors. If ¦
¦ not white. ¦ colors reappear, reset color point of ITC. ¦
¦ ¦ Otherwise replace ITC. ¦
+-----------------------+------------------------------------------------¦
¦ Test raster scan is ¦ If partially collapsed, adjust as appropriate. ¦
¦ collapsed ¦ If fully collapsed, replace card tray ¦
¦ horizontally or ¦ assembly. ¦
¦ vertically. ¦ ¦
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PS/2 Displays Maintenance Manual
Function Checks
¦ Copyright IBM Corp. 1993
2.7.2.1 - 1