Diagnosing 'Blank Copy' Problems
"I have just cleaned a Sharp SF 755 which
was quite dirty but now will not copy at all! No error codes paper
hot on exit, all seems well but the paper is blank."
(From: Bruce L. Miles (henry31@prodigy.net).)
Two things to try:
- Peek inside and see if you can detect a latent image on the
drum. If an image of your test document exists on the drum, then
the main corona unit is working at least.
- Perform a 'Skyshot Test'. Leave the cover off the glass and
take a picture of, well, the sky. It is a good idea to cover the
leading edge (left side) of the copy glass with a piece of paper
so that the fuser doesn't try so hard to jam on a solid sheet
of heavily tonered (blackened) paper.
If the skyshot print comes out white (it should
be entirely black since the amount of light hitting the drum compared
to reflection from actual copy is nil), and you DID have a latent
image on the drum, the prime suspect would be the transfer corona
- it is not receiving the high negative voltage needed to pull the
positively charged toner off the drum and onto the paper. The culprit
could be the corona wire being broken, the corona assembly not making
a good connection into its high voltage socket, or even some weirdness
going on with the high voltage power supply - i.e., supplying proper
voltage to the main corona, but nothing to the transfer corona.
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