IBM 3270 Maintenance Manual page 97

1.
Set the Power switch for the system unit to
Off (0).
2. Remove the math coprocessor from the system
unit. See Section 5, "Removal/Replacement
and Adjustments."
3. Set the Power switch for the system unit to
On (I).
DID THE SYMPTOM REMAIN?
NO Replace the IBM Math Coprocessor and
the
8088
Processor. See Section 5,
"Removal/Replacement and Adjustments."
YES Reinstall the math coprocessor; if you
need help, see Section 5. Set system board
switch number 6 to Off. See Section 6,
"Switch Setting." Then go to page
3-600-1.
3-85-2
Maintenance Information