IBM 3270 Maintenance Manual page 252

1.
Set the Power Off on both the system unit
and expansion unit.
2. Remove the covers from both units.
3. Remove the printer adapter from expansion
unit.
4. Remove the extender card. (This is the card in
the system unit that communicates with the
expansion unit.)
5. Plug the printer adapter into the vacant slot.
6. Go to 3-900-1 to rerun the PIC then return
here and answer the question below.
DID THE DIAGNOSTIC COMPLETE
WITHOUT ERRORS?
NO Replace printer adapter. See Section 5,
"Removal/Replacement and Adjustments."
YES
October 1984 3-900-7