IBM Personal Computer AT Manual To Operations page 381

16
Leave the printer cable disconnected from the
printer and run all the system tests again. Verify
that the list of installed devices and options is
correct. (Your printer will be missing from the
list) .
17
Did you receive any error when you ran the system
tests this time?
YES Have your system unit serviced. Be sure
your Key Lock key is with your system
unit.
NO
Have your system unit, printer and cable
serviced. Be sure your Key Lock key is
with your system unit.
18
Your printer is also controlled by program
commands from the system unit. If you are still
having a printer problem, or if you have a printer
problem only during a particular program,
examine the program thoroughly for commands
that may cause your printer to produce
undesired results. If you have completed the
printer self test and have no apparent program
problems, have your system unit, printer and
printer cable serviced. Be sure your Key Lock
key is with your system unit.
Test 8020-7