Printer and Photocopier Troubleshooting and Repair Collection : Sharp SF-71 copier will not reset       
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Sharp SF-71 copier will not reset

"I have an old Sharp SF-781 copier which will not reset. The diagnostic code "H1" is flashing on the display and the copier will not reset to the operation condition, using the keyboard clear sequence.

I have been able to reset the "H1" code before, but this time no luck."

(From: copymann@usa.net).

H-1 means an open thermal fuse on the upper fuser roller. Remove the cover on the fuser rollers and you will see a ceramic fuse located on the top plate. Check the fuse for continuity. If bad replace it with one with the same temperature rating, ( or close to the same ) Sometimes you can find them a radio shack. If not email me and I will send you one. If you order the fuse from sharp it is pretty expensive. If the fuse is good check the lamp in the upper fuser roller or the upper lamp triac. 99% of the time it is the fuse.