Specifications
378 Troubleshooting
Operational Problems
The Ready light does not turn on
The printer does not print (Ready light off)
The Ready light is on but nothing prints
Cause What to do
The power cord may not be 
properly plugged into the 
electrical outlet.
Turn off the printer, check the power cord 
connections between the printer and the 
electrical outlet, then turn the printer back 
on.
The electrical outlet may be 
controlled by an outside switch or 
an automatic timer.
Make sure that the switch is turned on or 
plug another electrical device into the 
outlet to check whether the outlet is 
operating properly.
Cause What to do
The printer is offline. Press the N Start/Stop button once to switch 
the printer to ready status.
Some error may have occurred.  Check the LCD panel to see if an error 
message appears.
Cause What to do
Your computer may not be properly 
connected to the printer.
Perform the procedure described in 
“Connecting the Printer to a Computer” 
in the Setup Guide.
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