Printer and Photocopier Troubleshooting and Repair Collection : HP LaserJet II fuser overheating        
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HP LaserJet II fuser overheating

(From: Glenn Allen (pclogic@xtra.co.nz).)

I had this problem on my HP LJII. I traced it to D155 shorted on the Fixing Heater Saftey PCB , this is in the same casing as the AC Power Assembly where the power cord plugs in. There was some sort of corrosion there.

I replaced it with a IN4148 diode as it is only a signal diode.