IBM 5531 Operator's Manual page 71

Problem Determination Procedures
Test 400 - Monochrome Display and Printer Adapter
(continued)
4. Did the following appear on your screen?
YES - Press Y; then press the Enter key. The system has completed this test
successfully. Continue with the next test.
NO -
Press N; then press the Enter key. Record the error message, and have the system
unit serviced.
5-400-4
Operator's Guide