DC12 Marks back of copy simplex

[Jake2o]

This is a bit of a strange one:

I have a DC 12 that marks the back of the copy when it goes through simplex. The marks on the copy appear to be a rubbed LE to TE version of the calibration patches that the machine puts down onto the IBT belt.

So far I have changed the IBT section, the IBT Cleaner Blade, the 2nd BTR UNIT, the IBT Cleaner Blade Retract Clutch (although this was out of another machine so its condition is unknown), Greased where the cams meet the Cleaner blade assy, the IBT Film seal.

It appeared to go away for a while after I changed the IBT Cleaner Blade Retract Clutch but has come back. The machine is on site so I cannot supply a sample image, but it definitely relates to the calibration patches.

Has anybody come across this fault before? And; if so, what was the solution?

[bojans]

Re: DC12 Marks back of copy simplex

As far as I remember problem solved with new retract clutch. Or try to clean that one. We used to clean it with alcohol.

[Jake2o]

Re: DC12 Marks back of copy simplex

Thanks for your reply, I did suspect retract clutch but because I changed it for one out of another machine I couldn't be sure.

[JustManuals]

Re: DC12 Marks back of copy simplex

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[kandod]

Re: DC12 Marks back of copy simplex

I see that you have tried changing the 2BTR, but if you have marks on the back the only suspect is the 2BTR unit.