I've been having problems with my Epson 7600 large format printer, I recently took it all apart to unblock the light black tube. I reassembled the printer and everything is back to normal apart from I now...
The most common cause of horizontal banding is generally missing,
deflected or clogged nozzles. To see if this is the cause you should
first print a nozzle check and examine the printout with a 10x or better
eye loupe for any missing or deflected nozzles. If nozzles are missing
or deflected you will need to perform cleaning cycles to recover these
nozzles.
Once all missing nozzles are recovered try printing your document again.
If
no nozzles are missing or deflected, check that you are using the
correct driver settings for the type of media you're printing on. Also
try printing at a higher resolution and turning high-speed
(bi-directional) printing off.
The most common cause of vertical banding is over-saturation of the
media, usually created by paper "rippling". To correct this effect,
decrease the saturation and lower the paper suction. If vertical banding
is still apparent print the image with high speed off
(uni-directional). If this corrects the issue, align the print head, as
described on page 5-6 of the Users Guide.
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