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Printer and Photocopier Troubleshooting and Repair Collection : LaserJet III: Where is the fuse?
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1994-2007, Samuel M. Goldwasser. All Rights Reserved. Reproduction of this document in whole or in part is permitted if both of the following conditions are satisfied: 1. This notice is included in its entirety at the beginning. 2. There is no charge except to cover the costs of copying.
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"I am looking for the fuse of an HP LJ III. I shorted an exposed wire
to ground at the fuser unit with my screwdriver. It was exposed
because someone broke the cover of the fuser unit. Now the printer
gets no power, the front display does not light, the fan does not come
on. I looked for the fuse in all obvious places to no avail. Any
hint is appreciated.
(From: Patrick Mulvey (pmulvey@li.net).)
A number of the fuses that are in the laserjets are hard to spot. There is
a small component on the boards that is a small black disk. You will have
to follow the wiring from the fuser back to the board and look for this
small component (fuse). I have on one occasion lost power to the paper feed
motors installing a card access device (defective harness shorted the
motor to ground), and found the "fuse" after looking everywhere. Looks
like a disk cap but leads are on opposite side of the disk and its mounted
parallel to the PCB. Hope this helps...