Dead Canon, Compaq, HP, and Similar Power Supplies
Apparently, these power supplies may blow their
internal fuse either as a result of an overload, or
possibly for no reason at all. In this case, a new
fuse will be all that is needed. Of course, it's
also possible that there is a fault in the power
supply or in the printer which will cause the new
fuse to blow but it's worth trying a new fuse before
more complex troubleshooting.
(From: Jim Steel (procomputer@telisphere.com).)
Repair instructions
The power supply is encased in a bonded 2-piece ABS
plastic housing. There is a fuse inside but no way
to access the fuse without splitting the case.
Splitting the case:
Unplug the power supply and secure the power supply
in a utility vice. Use a short-blade utility knife
or linoleum knife to slowly and carefully and cut
along the seam where the 2 halves of the power
supply are joined. Don't try to cut the seam all at
once. Work a little at a time until the case halves
can be separated.
Replacing the fuse:
On a power supply with an unsoldered fuse socket,
simply replace the fuse and test the power supply.
Alternately, a leaded fuse may be soldered in.
On a power supply with the fuse soldered into the
fuse socket, leave the fuse in the socket and solder
in a leaded fuse. (A leaded fuse has lead wires
extending from each end of the fuse.)
On a power supply with a leaded fuse, unsolder the
old fuse solder in a new leaded fuse.
Testing the power supply:
Ensure that the power supply and printer work before
bothering to close the case.
Closing the case:
ABS plastic cement may be used to bond the power
supply case halves. Alternately, electrical tape may
be used to hold the case halves together.
Printer and Photocopier Troubleshooting and Repair
Collection
Version 2.48
Copyright © 1996-2001
Samuel M. Goldwasser
--- All Rights Reserved ---
For corrections/comments/suggestions, please contact
me via the
Sci.Electronics.Repair FAQ Email Links Page.
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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