IBM i 830 Repair Manual page 485

This ends the procedure.
24. The cable network is bad. The wires in the cable between the console and the
twinaxial workstation attachment are reversed. Go to step 30 of this
procedure.
25. Perform the following:
a. Find the twinaxial workstation attachment to which the failing console is
attached.
b. Disconnect the cable from port 0 on that twinaxial workstation attachment.
c. Connect the port tester to port 0 on the attachment.
d. Set the selector switch on the port tester to the left (1) position.
26. Press and hold the test switch on the port tester for 15 seconds and observe
the lights.
If the port tester has three lights, do the following:
v If both the top (green) and center (yellow) lights are on, continue with step
27 of this procedure.
Note: The center (yellow) light is always on for twisted pair cable and may
be on for fiber optical cable.
v If only the bottom (yellow) light is on, continue with step 27 of this
procedure.
v If all lights are off, continue with step 27 of this procedure.
v If only the top (green) light is on, go to step 29 of this procedure.
v If all lights are on, go to step 28 of this procedure.
If the port tester has two lights, do the following:
v If only the top (green) light is on, go to step 29 of this procedure.
v If only the bottom (yellow) light is on, continue with step 27 of this
procedure.
v If both lights are off, continue with step 27 of this procedure.
v If both lights are on, go to step 28 of this procedure.
27. The test indicated that there was no signal from the system. Reconnect the
cable you disconnected and perform the following:
a. Exchange the following parts:
1) Twinaxial workstation IOA card
2) The multi-adapter bridge (see "MA_BRDG" on page 554.)
b. Power on the system to perform an IPL.
This ends the procedure.
28. The tester is in the self-test mode. Check the position of the selector switch.
If the selector switch is not in the left (1) position, set the switch to the left (1)
position. Then go to step 26 of this procedure.
If the selector switch is already in the left (1) position, the port tester is not
working correctly. Exchange the port tester and go to step 25 of this
procedure.
29. The cable to the workstation is the failing item.
Continue with the next step of this procedure.
30. Cable maintenance is a customer responsibility.
See the information that is listed below for more information on correcting
cable problems.
Chapter 3. Problem Isolation Procedures (PIPs), Failing Items, and Symbolic FRU Isolation
Twinaxial Workstation PIPs
471