Editing IBM PS/2 Model 80 (section)

== Known faults ==

* Dust drawn in by the supply fan settles on the part of the system board under it, which holds the 8042, the MC146818A, the diskette controller, the NS16550 UART and the RTC crystal. Peter Wendt reports that it causes lost configuration, a wrong clock after long power-offs and diskette or disk read/write errors that survive a new battery.<ref name="atcommon80" /><ref name="at8580c" />
* Peter Wendt reports that about half of the failed Model 80 supplies he saw had a broken power switch, the red ones more often than the white.<ref name="atpwr80" />
* Diskette drives fail with surface-mount electrolytics on their logic boards going open or high-ESR, and with mechanical faults that give a 162 at POST.<ref name="atfdd" />
* The 6 V lithium pack wears out; IBM retain tip H024809 sets the replacement point at 5.5 V.<ref name="atcommon80" />
* A 1780 on an 8580-041: IBM retain tip H064300 says to check the fixed-disk cables first.<ref name="atcommon80" />

The [[IBM PS/2 Model 80 Troubleshooting Guide]] covers the error codes, and the [[IBM PS/2 Model 80 Maintenance Guide]] the battery, supply checks and cleaning.