On Wed, 29 Jun 2011 12:08:16 -0700, whit3rd wrote:

On Saturday, June 25, 2011 4:42:55 PM UTC-7, Robert Macy wrote:
Have an old HP LaserJet 5L that is streaking on the page. The streaks
are horizontal [perpendicular] to the paper path.
[and paper feed is problematic]

There are several ways the perpendicular-streak symptom can be
generated. It can be a power or gain fluctuation in the laser drive
(this is rare). It might be a faulty corona discharge wire/connection;
if you can identify the HV contacts you can clean those with isopropyl
alcohol. it can be a light leak (easy to check, just make test pages in
the dark). And, if toner has made a dirty streak on the toner
cartridge in the past, it MIGHT have transferred a dirty stripe to the
fuser roller. Repetitive streaks tell you the circumference of the
roller that causes this kind of problem. I've had some luck (not much)
cleaning photoconductor drums with Scotch tape; stick the tape over the
deposit, then lift the tape off and hope the deposit comes with the
tape. Any roller OTHER THAN the photoconductor can be cleaned with
isopropyl alcohol.

For paper feed, clean the pickup rollers (rubbery things that drag the
top sheet of paper) with isopropyl alcohol.

I've cleaned lots of 5 HP printer laser prisms and mirrors in industrial
applications. They are very prone to contamination from smoke.



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