Dell P1500 Personal Mono Laser Printer - Manual (Page 64)

Secondary error code
What this light sequence means:
The printer memory does not have the free space necessary to collate the
print job.
This may happen due to one of these errors:
Memory is full.
A page is too complex to print.
A page is shorter than the set page margins.
Memory is insufficient to save what is in the buffer.
What you can do:
Press and release Continue to clear the message and continue
printing the job (the job may not print correctly.)
Press and release Cancel to cancel the print job.
Press and hold Cancel to reset the printer.
To avoid this error in the future:
Simplify the print job. Reduce the complexity of the page by
reducing the amount of text or graphics on the page and deleting
unnecessary downloaded fonts or macros.
Install additional printer memory (refer to the Owner's Manual
for instructions).
Secondary error code
What this light sequence means:
The printer is processing data, but the memory used to store pages is full.