Editing IBM 3270 PC/G Maintenance Guide (section)

== Inspecting the System ==

In service order:

# '''Standard 3270 PC chassis inspection''' — see [[IBM 3270 PC Maintenance Guide]]. RIFA caps in the IBM PSU are the canonical preventive replacement target.
# '''5278 PSU bulk caps''' — visual check for bulging, leaks.
# '''5278 vector graphics processor''' — reseat if unsocketed; visual check for damaged traces near the 75-pin connector.
# '''75-pin cable between 5278 and 5279''' — high pin count means many potential intermittent contacts. Clean both connectors with deoxidising contact cleaner.
# '''5279 CRT''' — inspect flyback for cracked insulation; check for phosphor burn-in (static graphics images displayed too long).