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.