HP 3500 - Manual (Page 173)

Jam inside the upper rear door
Note The message 13.XX.YY JAM INSIDEUPPER REAR DOOR can appear on the printer
control panel if the upper rear door is open. Make sure the upper rear door is closed when
printing.
1. Remove any paper visible in the top output bin.
?
2. Open the upper rear door.
3. Remove any paper.
ENWW Clearing paper jams 161