OT laser printer question
ard at p850ug1.demon.co.uk
Thu Mar 9 14:58:37 CST 2006
> If its the physical letters on the paper, if they are lumpy or if they
> are smearing if touched then your High Voltage power supply board is
> starting to fail.
Can you be a little more specific? What is the _real_ cause of the problem?
Intuitively, if the toner smears when touched, I'd assume it wasn't being
fused properly, and would investigate the fuser and its control system
first. How does a problem with the HV supply cause this fault?
Getting back to the HV system, I know that in my SX (and I think in
the CX before it) printer, there's an AC 'ripple' applied to the high
voltage on the toner reservoir that causes the toner to come on and off
the drum slightly, and thus improve the evenness of distribution. Maybe
if that was malfunctioning it would cause this sort of problem.
Alas I only have (my own) schematics and notes for the CX and SX
engines, nothing later, so I can't really comment.
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