Lexmark T420 User Reference page 25

The operator panel has six lights.
The following light sequence indicates a jam:
Ready/ Toner
Data Low
When you see this light sequence, press and release the Continue button twice quickly. A secondary
jam light sequence displays.
Use the table on the following page to locate instructions for clearing the jam causing the secondary
light sequence.
Note: Make sure to clear the entire paper path. After the path is clear, press and release
Continue to clear the message and resume printing. If the Paper Jam light
remains on after you remove a jam, and press and release Continue, check the
duplex area for a jam.
Load/Remove Paper
Paper Jam
25
Press
Error Continue