Applica RV500C : Technical information : Page 223

2.7.2.2 Pattern Checks

The Pattern checks should be performed using pattern A from the IBM

Personal System/2 Color Displays Test-Pattern diskette.

Before starting any checks, ensure that all plugs and connectors are

positioned correctly and securely.

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 ¦

+-----------------------+------------------------------------------------¦

¦ Displayed image width ¦ Adjust RV303. If symptom persists, replace ¦

¦ is too large or too ¦ card tray assembly. ¦

¦ small. ¦ ¦

+-----------------------+------------------------------------------------¦

¦ Displayed image ¦ Adjust RV400. If symptom persists, replace ¦

¦ height is too large ¦ card tray assembly. ¦

¦ or too small. ¦ ¦

+-----------------------+------------------------------------------------¦

¦ Color purity of ¦ Check degauss circuit. Ensure that P100 is ¦

¦ displayed image is ¦ connected. Power off for 30 minutes. Power ¦

¦ poor. ¦ on again to check degauss action ("Degaussing" ¦

¦ ¦ in topic 1.2.4 explains the action). If ¦

¦ ¦ symptom persists, replace card tray assembly. ¦

¦ ¦ ¦

¦ ¦ ITC defective. Replace ITC. ¦

+-----------------------+------------------------------------------------¦

¦ Contrast or ¦ Replace card tray assembly. ¦

¦ brightness controls ¦ ¦

¦ are not working. ¦ ¦

+-----------------------+------------------------------------------------¦

¦ Maximum or minimum ¦ Video color point is not set. Adjust as ¦

¦ white is poor. ¦ appropriate. ¦

+-----------------------+------------------------------------------------¦

¦ East-west pincushion ¦ Adjust RV302 for optimum vertical lines. If ¦

¦ correction is poor ¦ this is not possible, replace the card tray ¦

¦ (vertical lines are ¦ assembly. ¦

¦ bowed or barrel ¦ ¦

¦ shaped). ¦ ¦

+-----------------------+------------------------------------------------¦

¦ No horizontal or ¦ Ensure the display signal cable is connected ¦

¦ vertical ¦ to the correct port in the system unit. Power ¦

¦ synchronization. ¦ off the system unit, then power on the system ¦

¦ ¦ unit. ¦

+-----------------------+------------------------------------------------¦

¦ No horizontal or ¦ If good with test raster (signal cable ¦

¦ vertical ¦ disconnected), replace signal cable. ¦

¦ synchronization. ¦ ¦

¦ ¦ ¦

¦ One or more colors ¦ ¦

¦ missing. ¦ ¦

+-----------------------+------------------------------------------------¦

¦ Displayed image does ¦ Replace card tray assembly. ¦

¦ not synchronize ¦ ¦

¦ horizontally. ¦ ¦

+-----------------------+------------------------------------------------¦

¦ Displayed image does ¦ Replace card tray assembly. ¦

¦ not synchronize ¦ ¦

¦ vertically. ¦ ¦

+-----------------------+------------------------------------------------¦

¦ Displayed image is ¦ Adjust RV304. If image cannot be centered, ¦

¦ not centered ¦ centering circuit is faulty. Replace card ¦

¦ horizontally. ¦ tray assembly. ¦

+-----------------------+------------------------------------------------¦

¦ Displayed image ¦ Height selection circuit is faulty. Replace ¦

¦ height varies ¦ card tray assembly. ¦

¦ excessively between ¦ ¦

¦ modes. ¦ ¦

+-----------------------+------------------------------------------------¦

¦ Displayed image ¦ Replace card tray assembly. ¦

¦ appears broken up ¦ ¦

¦ horizontally. ¦ ¦

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PS/2 Displays Maintenance Manual

Pattern Checks

2.7.2.2 - 1