Bizhub c451 dirty copies

[ICEDRAGON]

How can we get a picture into this message area for you to view and give us feed back, its basicly dumping developer on the top part of both sides of the page after we run around 5,000 pages on a new Black IU, we have changed the Transfer Belt, the black IU three times, the fuser, the PWB assembly MC and the High Voltage Unit /1 and the problem just keeps coming back.

Please some one help!

[thuo]

can you try to set toner replenishing mode to auto

[Si@danwood]

I presume that you have tried a new transfer belt at some point?

[rprem]

hi friends

I got the same problem in 253 machine,wt was the machine yeild u r changing the drum for the first time wt makes u to change the drum
if u get error codes so u r changing the drum
reply me

[Albonline]

sorry for the delay. on vacation. i would suspect the other hv unit. we had quit a few of these units have cascade failures. takeing out hv1 hv2 and mcb . replacing 1 unit at a time just ruined the new unit. you may need to replace all 3 together.sorry for the bad news!

[Albonline]

try changeing hv2 first!!!!

[Stirton.M]

	Quote:			Originally Posted by ICEDRAGON
	Hello :- Any thoughts?

Check storage of IUs....or how they are being delivered to you. There could be physical damage to the housing and the developer bias contacts internally. I've seen this myself a couple times.

TSB refers to HV1 as defective if you are getting starter on your prints...though I doubt that is related to your problem.

Check for developer bias contacts...yours might be damaged on that machine. It is highly unlikely the dev units are at fault if this happens constantly. Also, be sure to completely clean the entire area under the IU to eliminate any errant bias to earth ground. Check your contacts to the HV boards with relation to the bias contact in the back.

Also, in some cases, I have found that the lock latch can be problematic on this series...451,550 and 650. The black IU tends to drift and lose all bias, the net result is poor black reproduction and P codes related to it.