IBM 5150 Hardware Maintenance Manual page 62

Remove the Parallel Printer Adapter cable. To continue,
press
g
and
~
(Enter). The following will appear on
your Display:
7~H
PARALLEL PRINTER ADAPTER TEST
~
".",,:;:,:,",
1"'1""
TEST WITH WRAP PLUG (YIN)?
•
DID YOU COMPLETE THE TEST WITHOUT AN ERROR?
NO
Replace your IBM Monochrome Display and Parallel
Printer Adapter. See Section 3, "Removal/
Replacement. "
YES
400-9