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I checked with an experienced 6204 service representative and his reply was that troubleshooting above a customer level was required.
"It Looks like something's wrong with BTR, BCR, or mag roll. "
You can find a lot of solutions and other resources on the Xerox 6204 Wide Format Printer site:
In this case I would suggest that you consider contacting our specific product support experts at the following link:Fast Track to the Expert