Tandem drawer jams at reg. rollers and kicks down B2 guide plate. Removed feed unit and cleaned one way bearings and shafts and replaced p/f/s rollers, no help. Cleaned all rely/transport rollers, one ways and sensors. Drawers two and three feed fine. Played around with guide plates at reg.rollers, seem to remember this caused similar problem on a mp5500. Any help appreciated, going back tomorrow. This customer has little patience! Thanks...
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