IBM 5280 User's Setup Procedures page 132

126
72. Observe this display.
This display will appear for approximately 20 seconds.
Communications test in process.
57-02
J
K 1 . If the top line of the display starts blinking, press the
Reset or Error Reset key. The following display will
appear:
Test Terminated.
j .
F(E,:STf',Fn
-, EXIT
Sf:.·l.pct
option-
r,
Prpss FNTEF:
l
J
K2. Press the number 1, then press the Enter key.
Repeat step 59 through 73. If the top line of the display
starts blinking again, record the four-digit error code
number for reference and call your service
representative.