Oki ES3640MFP Service & Troubleshooting Manual page 76

372：Paper Jam
Condition
Error 372 occurs when paper jams in the front area of the duplex unit.
1. The IN2 sensor does not change to ON-state within the predefined time after paper has exited from the duplex unit.
The printer stops printing immediately when the jam occurs.
Cause
1. Transport rollers or registration rollers cannot transport paper because they have become dirty with paper dust, etc.
2. A piece of paper, foreign substance, etc., got stuck in the IN2 sensor lever.
3. IN2 sensor motion failure
How to remove the jammed paper
Open the tray1 side cover - Pull the jammed paper in the direction shown - Close the tray1 side cover
Pull the opener and open the side cover - Remove the jammed paper and close the side cover.
Pull out the duplex unit - Pull the lever at the right side of the duplex unit open - Hold the two levers and slowly pull out the
Continue to pull it out slowly while lifting it slightly - Remove all the sheets that have jammed
If you have been performing continuous printing, some paper may still remain in other areas. After opening and closing the
cover, if other error code is displayed, follow the jam clearance method of that code.
Check Points
Hold the two levers and slowly pull out the duplex unit until it stops - Continue to pull it out slowly while lifting it slightly.
Frequent Jams: Check the inside of the duplex unit and clean the rollers
substance in the paper path. Check for smooth operation of the sensor arms
Jam indication though there seems to be no jammed paper:
Check for a piece of paper or foreign substance in the DUP-R and DUP-F sensor. Check for smooth operation of the sensor arms
duplex unit until it stops
Pull out the duplex unit and check the following areas and clean them.
Check for a piece of paper or foreign