24 Printer Parts
Options and Consumable Products
Options
You can add to your printer’s capabilities by installing any of the 
following options.
❏ The 500-Sheet Paper Cassette Unit (C12C813911) holds one 
paper cassette. It increases paper-feeding capacity up to 500 
sheets of paper.
Data light
(Yellow)
On when print data is stored in the print 
buffer (the section of printer memory 
reserved for receiving data) but not yet 
printed
Flashes when the printer is processing 
data
Off when no data remains in the print 
buffer
Ready light
(Green)
On when the printer is ready, indicating 
that the printer is ready to receive and 
print data
Off when the printer is not ready
Start/Stop button When the printer is printing, pressing 
this button stops the printing.
When the error light is flashing, pressing 
this button clears the error and switches 
the printer to ready status.
Error light
(Red)
On or flashes when an error has 
occurred