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Dave10
01-12-2010, 07:09 PM
We just replaced the HV1 board on a Bizhub C451 for the problem of pulling developer from the black I.U. When we were finished, we made 100+ black copies with no problems. When we tried color copies, on the second or third copy, we got a multi-colored smudgy image on the lead edge of the copy. It looks like it may be a light, smeared repeat of the pattern from earlier copies. We replaced the belt assembly with the same results. Any ideas?

Haroldbfix
01-12-2010, 08:48 PM
Yes, increase the 1st transfer roller voltage on all colors set them to 7. That should solve that issue.

Stirton.M
01-13-2010, 12:27 AM
We just replaced the HV1 board on a Bizhub C451 for the problem of pulling developer from the black I.U. When we were finished, we made 100+ black copies with no problems. When we tried color copies, on the second or third copy, we got a multi-colored smudgy image on the lead edge of the copy. It looks like it may be a light, smeared repeat of the pattern from earlier copies. We replaced the belt assembly with the same results. Any ideas?

Cleaning bias on the belt "might" be weak. To verify, print a few pages of the same image...about 5, and when the second sheet is exiting, force a jam...just open a door. And then remove the transfer belt and inspect. If you see a latent image on the "cleaned" portion of the belt (just after the cleaning unit), this is the issue.

10.6.2 Transfer Belt
A. Cleaning Bias
Functions • To set the level of transfer belt cleaning bias independently for each process speed.
Use • When the image pattern is not completely removed, it strengthen the transfer belt cleaning bias in order to make the cleaner more effective.
• For each processing speed, positive and negative output values can be set.
Setting/ Procedure
• The each default setting is 0.
-5 to +5 (step:1 *)
*: One step corresponds to 5μA.

If that is not the problem, paper weight might be. If you are doing card stock or anything like perhaps 80lb glossy text, you need to set the paper weight accordingly. The fusing unit sets its temperature based on this and will cause ghosting if not set to the correct weight.

Dave10
01-14-2010, 07:28 PM
Thanks Haroldb. We did change the transfer voltage and the problem went away. Worrisome, but better than nothing.

Haroldbfix
01-15-2010, 04:22 AM
Thanks Haroldb. We did change the transfer voltage and the problem went away. Worrisome, but better than nothing.

Good, im glad it work for you. One down and many more to go! :D

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