AT&T MERLIN LEGEND Communications System Release 2.0 Maintenance And Troubleshooting Manual page 115

Control Unit Problems
For each test, note the following:
When beginning the board controller test or the internal
Ioopback module test, you have the option of running it once or
repetitively.
You can interrupt any module test by selecting Exit.
A module test fails for one of the following reasons:
If errors indicate that the module is faulty, record them on the
module repair tag immediately after running the test.
5.
Run the internal Ioopback test.
If errors occur, record them as described in Step 4.
6. Run the board controller test.
If errors occur, record them as described in Step 4.
7.
For MLX modules (008 MLX and 408 GS/LS-MLX), continue with the
BchLoopback test.
If errors occur, record them as described in Step 4.
For 100D modules, continue with the CSU Ioopback test, which is
8.
described later under "100D Module Problems."
If errors occur, record them as described in Step 4.
9. Replace the module with a module of the same type, whether
troubleshooting or replacing it permanently.
Restore the module as follows:
10.
Menu
Yes
For additional information on restoring a module, see "Restore" later in
this section.
Restoring automatically undoes the busy-out and reset.
The module being tested was not busied-out. Exit the
test, busy-out the module, and try again.
The error messages indicate that the module is faulty.
Maintenance
Type the slot number
Slot Restore
Module Problems 4-25