Our organization just purchased a brand-new M401dn, and I was setting it up out of the box. After configuring IP, I went to print a report. The paper jammed from Tray 2 with the message "Jam in cartridge area. Open door and clear jam". So I cleared it and started again. All to no avail; it keeps jamming. I tried printing from Tray 1 and it's the same; the paper is getting folded up in almost a concertina-style and not feeding through properly.
I've set the correct paper sizes (Letter) in the printer, updated its firmware, checked to see if there was anything snagged in the paper transport (there isn't anything), and I'm running out of ideas. The paper weight I'm using is 20lb (75g/m2), so that shouldn't cause any problems with transport.
We've purchased three M401n's before, and they've been a snap to set up. Thus far, I am very far from impressed with the M401dn. Any suggestions / ideas would be received gratefully.