Originally Posted by
Prints Charming
This is definitely not a regular issue.
What are your firmware levels on these machines?
Are your fuser units refurbished or brand new?
Are you fitting all modification parts for these fuser units?
Are you using genuine toner? (sorry, have to ask).
I read the key part of your post is it happens when duplexing. This would indicate your lead edge margin might be far too small. On the second pass through the fuser, image close to the lead edge is sticking to the lower fuser roller and subsequently wrapping. Check your lead edge margin values and maybe reset as-per the service manual.
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