IBM 3270 Maintenance Manual page 261

1. Disconnect the Communications Adapter
Cable (if attached) from the Asynchronous
Communications Adapter.
2. Refer to the figure below and install the wrap
plug on the Asynchronous Communications
Adapter.
3. Press Enter to begin the test. The test may
take up to 15 seconds.
~
Alt Asvnch Adapter Connector
/
IBM Communications Adapter
Wrap Plug
DID THE TEST FINISH WITHOUT AN
ERROR?
YES
Go to page 3-1100-10.
NO
3-1100-6 Maintenance Information