Dead Canon, Compaq, HP, and Similar Power Supplies

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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
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For corrections/comments/suggestions, please contact me via the Sci.Electronics.Repair FAQ Email Links Page.
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