The long saga of repairing a Hewlett-Packard 9825 laboratory computer which was destroyed when its power supply failed was covered in SCANALYZER before its migration to this platform. Use this search query to find the episodes.
After the last installment on 2021-09-23, everything was working except for the cartridge tape drive, which appeared to be completely dead. Now the intrepid restorers turn their attention to it, seeking to complete repairs to the machine, and discovering more ways integrated circuits can blow out when their power supply goes berserk.