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C5100 Troubleshooting • 137
Troubleshooting
LCD MESSAGES
Message Meaning What to Do
* TONER SENSOR ERROR Flashes across the
second line of the
display: the indicated
color toner (*) is
missing from the
printer.
Open the top cover and
make sure the
indicated toner is there
and properly seated in
the printer: C = Cyan, Y
= Yellow, M = Magenta,
K = Black.
ADD MORE MEMORY
420: MEMORY OVERFLOW
The document size
is too large for the
printer’s memory.
Reduce the size of the
document. If this
happens frequently,
install additional
memory (see “RAM
Memory” on page 113).
CANCELLING JOB
(JAM)
The setting for Jam
Recovery in the
menu has been
changed to off and a
paper jam has
occurred. Any
unprinted data is
being deleted.
Clear the jam and
resend the missing
pages of the print job.
CHECK BELT
330: BELT MISSING
The belt unit is not
properly installed.
Open the top cover and
lift out the black (K)
and Yellow (Y) image
drums, placing them on
a flat surface. Check to
be sure that the belt
unit latches are fully in
the latched position:
then reinstall the image
drums.