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.
 +------------------------------------------------------------------------+
 ¦ 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.           ¦                                                ¦
 +------------------------------------------------------------------------+
PS/2 Displays Maintenance Manual
Function Checks
¦ Copyright IBM Corp. 1993
2.7.2.1 - 1










