IBM 5280 User's Setup Manual page 137

130
63. Observe this display.
This display will appear for approximately 20 seconds.
Communications test in process.
11. If the top line of the display starts blinking, press the
Reset or Error Reset key. The following display will
appear:
Test Terminated.
j..
1:<ESTAFa
2. EX I T
Select option: 2 Press ENTER
l
J
12. Press the number 1, then press the Enter key.
Repeat step 59 through step 63. If the top line of the
display starts blinking again, record the four-digit error
code number for reference and call your service
representative.