Epson EPL-6200 Reference Manual page 361

The optional Duplex Unit's upper cover is open. Make sure that
the Duplex Unit's upper cover is closed properly by opening and
closing it again.
The Lower Cover of the Optional Duplex Unit is Open
Control panel: Error light on
The optional Duplex Unit's lower cover is open. Make sure that
the Duplex Unit's lower cover is closed properly by opening and
closing it again.
Manual Feed
Control panel: m, Ready, and Error lights flashing (Slowly)
Indicates that the Manual Feed setting is selected in the printer
driver. Make sure that the desired paper is displayed in the
printer driver and loaded in the manual feed slot on the MP tray.
You have to press the N Start/Stop button once when you want
to print in manual feed mode.
Remember to clear the Manual Feed setting in the printer driver
settings before trying to print from the MP tray or the optional
500-Sheet Lower Paper Cassette Unit A4 after printing in the
manual feed mode.
Note:
When printing with manual feed, take out the paper loaded into other
paper sources.
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Troubleshooting