Hi all, have spent most of today on a 6501 which is coming up c2451 (low yellow toner concentration in dev unit). On inspecting the m/c I found the yellow drum to be coated with toner. I put the magenta dev unit in the yellow position with the same result. I fitted new corona units swapped drums around and fitted new potential sensors all to no effect. I`ve come to the conclusion that the HV has failed and there is no charge on the yellow drum and have ordered the HV boards, but I would be interested to see if anybody out there has had a similar fault. Looking forward to your replies...51
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you may have a failure in the yellow dev unit itself. I had a similar code today but with the black...replaced the unit and developer in it and carried on....
The PRCB controls that sensor."Many years ago I chased a woman for almost two years, only to discover that her tastes were exactly like mine: we both were crazy about girls."
---Groucho Marx
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I will not answer requests or questions there.
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Problem solved, it was HV1 failure.Comment
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I had the same problem on Monday. I went to I/O and ran 54-00 ran the numbers until it got to 128 than ran toner refresh. and it worked . Ive done this 2 prior times .Comment
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Thats fine if its just gone undertoned, but in my case it was impossible to tone it up. As a foot note to all this, I had the fault again at a different customer about a week later and that was a HV1 failure as well. Sods law I suppose but at least theyre both fixed now!!!Comment
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