Try this:
20 MEM OVERFLOW
20 INSUFFICIENT
MEMORY
Indicates a memory overflow. Too much data is being sent
to the printer and the printer has run out of memory.
Pressing the [Continue]* key causes the printer to print only
the information it received. If the error persists, it may be
necessary to simplify the print job (such as fewer fonts and
less graphics information), or have the customer purchase
additional memory.
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