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Dirty mirrors in the laser unit?
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Technician
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hmmm, i have always associated dirty laser mirrors to a light print out, but i guess i will have to pull it apart to confirm either way.i can check out the laser adjustment assembly as well. thanks,
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Sorry, I'm confused, the black text is blurred? This is on black only, not composite black?
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If it's in the subscan direction then the ld unit wouldn't be the problem, it affects main scan -front to rear. The subscan is a product of the drum rotation, so I would look at the black drum/dev drive. Is the 'offset/blur' repeating itself? If so you should be able to determine what component is causing it by measuring the distance between them (print a test pattern on 11x17).
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Technician
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sorry, the image is not really blurred, it is two distinct images overlayed with a 1/2mm offset in the feed direction. this occurs only in the black mode. the full colour mode prints are perfect even if its just black text.
i have added a link to the image http://www.bmss.ca/incoming/20101122141233632.pdf
Last edited by genco; 11-23-2010 at 01:40 PM.
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Ok, now I see. In this case then it looks like a misalignment of the lasers. Black uses a dual beam laser and color only one so it would be in the LD unit. Do a beam pitch adjustment for both 600dpi and 1200 dpi, that may correct it. If it doesn't work, consider replacing the Black LD unit or the entire laser assembly.
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4. Print out the following test pattern (Cross Stitch M) with SP5-997.
5. Check these test patterns. Vertical black strips show if the laser beam pitch is
not correct.
• Cross-stitch pattern: The thin lines should be of uniform thickness (no
striping effect should show on the printout).
6. Adjust the laser beam pitch values in SP2-109-2 and 3 until the section of the
printout [A] is correct.Attachment 7285
beam_pitch.jpg
Last edited by teebee1234; 11-24-2010 at 12:23 AM.
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Technician
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thanks teebee, i made it back to the customer with the 3245c and after some testing found that adjusting the 600 dpi was the only one to make a difference. i had to push it from 42 to 98( max) to make it line up. i'm not comfortable with this because i don't know what caused it, but its working for now.
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