OKI C5100 User Manual

C5100 Troubleshooting  • 138

CHECK FUSER
320: FUSER MISSING

The fuser unit is not 
properly installed.

Open the top cover and 
check to be sure that 
the fuser unit is 
properly seated in the 
printer and that the lock 
levers are pushed all 
the way toward the 
back of the printer:

CHECK MP TRAY
390: PAPER :JAM

Paper has jammed 
while exiting the MP 
Tray.

Clear the jam: see 
“Jam 390” on 
page 135.

CLOSE COVER
316: DUPLEX COVER OPEN

The duplex cover is 
open or not properly 
latched.

Close the duplex 
cover:

CLOSE COVER

nnn

: COVER OPEN

Either the top cover 
or the front cover is 
open.

Be sure both the top 
cover and the front 
cover are firmly closed.

INSTALL PAPER 

CASSETTE

430

: TRAY 1 MISSING

Tray 1 is not 
installed in the 
printer.

Install the missing tray.

INSTALL PAPER 

CASSETTE

440

: TRAY 1 OPEN

Tray 1 is not properly 
installed in the 
printer.

Make sure the tray is 
pushed fully into the 
printer.