IBM 3270 Maintenance Manual page 346

IS THE RESISTANCE CORRECT?
NO
Replace the Distributed Function
Communications Adapter. See Section 5,
"Removal/Replacement and Adjustments."
YES Follow your local procedures for reporting
problems external to your 3270 Personal
Computer. If you have followed these
procedures and still have an unsolved
problem You should replace the
Distributed Functions Communications
Adapter. See Section 5,
"Removal/Replacement and Adjustments."
October 1984 3-2800-11