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Diagnosing a blank vertical strip problem on
Apple Laserwriter IINT
(From: Tony Duell (ard@p850ug1.demon.co.uk).)
There aren't many (if any) electronics faults
that can cause this, thankfully...
First press the test button on the side of the
bottom casing round the back. Does the test printout also have this
strip missing? If not, then you've got a very strange problem with
the formatter board, and I'll have to think again...
Secondly, take out the cartridge and shake it,
and put it back in. If that doesn't help, then try a new toner cartridge.
If you've still got problems, then the most likely
problem is something in the beam. SX engines (which you have, and
CX engines and...) print black where the drum is discharged by the
laser [1]. Start by removing the toner cartridge. There's a black
metal strip in the top cover above the toner cartridge. By fiddling
with it you can move it slightly, exposing a front-silvered mirror.
Inspect that for bits of paper, etc. Clean it _very_ carefully.
Next area to look at is the laser scanner itself.
If you know what you are doing, take off the outer casing (screws
round the outside, some under the lip that the lid closes onto,
and 2 on a metal bracket at the left side of the fuser) and look
at the scanner block. This is the black thing mounted over the paper
tray. Unplug the cables (one to the laser PCB itself, one to the
scanner motor under the little flap on top), undo the small screw
to release the optical fiber, and undo the 4 screws that hold the
scanner in place. Lift it out. Look at the slot on the front edge
for any paper, etc. I don't know if I recommend you opening the
scanner (Canon DO NOT, but I've done it), but you can carefully
trim back the heat-moulded studs and open the cover. Look for debris
inside. Handle it with great care, of course.
(From: Ken Eckert (eckert@sfu.ca).)
One problem that gives this printout is loose
screws on a plate in the top cover above the toner cartridge. The
screw(s) fall out and get stuck in the toner shutter window that
that the laser goes through. I've had a couple like that, I made
it a habit to tighten those screws whenever I work on one of these
Canon engines.
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