On Sat, 25 Jun 2016 16:28:32 -0000 (UTC), "Emran M."
wrote:

That enigma should give me a clue as to what the cause is, but
I can't think of anything that goes horizontally.

Hmmm... 15 year old printer. Is it dirty inside?

If it's a thin black line, such streaks are usually caused by the
laser scanner or formatter electronics. Some dust on the rotating
mirror might do the trick (not sure). However, that doesn't quite
match your vague description.

The various rollers will leave their footprints, but not as a
continuous line across the page. However, if it's a broad smear, it
can easily be a burnt toner cartridge that was left in the sun, which
then burned the drum. A scorched fuser roller will do much the same
thing. Please heed the advice of others to measure the distance
between the horizontal lines, divide the distance by 2*Pi, which
should yield the diameter of the offending roller.

If you want to continue this, I suggest you take a photo of an
offending page, post it to a public photo site, so we can look at it.
Otherwise, make an effort to be more specific than "horizontal
streaks".

The manual is 10 dollars
https://www.tradebit.com/filedetail....service-repair

Free service manual:
http://www.lbrty.com/tech/Manuals_HP/3200sm.pdf

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558