Hi Deborah, if you hold down the enter key while the error code 16 is
flashing it will give you another sub code which will be numbered from 00
to 07, this code will specifically tell you what type of I/O runtime
failed.

00 = unrecognized nonpacket request or response
01 = return status indicates failure from I/O
02 = undefined return status
03 to 05 = communications protocol errors
06 = power on self test failure
07 = reset response time-out

We sell and service the 256x printers line printers. I can't sell one of
our service manuals but I could probably photo copy and fax you some
information on your 2563C printer.

Jesse
Cypress Technology Inc

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