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Power Supply Problems
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Save the system programming to a memory card (beginning with
Release 3.0). See Appendix D, “Backing up with a Memory Card, ” for
detailed instructions. If automatic backups are performed, it may not
be necessary to save system programming.
NOTE:
If the processor module is not functioning, it may not be possible to back up
system programming.
Power Supply Problems
If the power supply fails, all components connected to the carrier are
automatically shut down.
Checking the Power Supply
If you suspect power supply failure, check the following:
■ Power supply LED
■ Interlocking post (on the carrier, behind the power supply)
■ Ring generator, if present
■ Auxiliary power unit(s), if present
WARNING:
Never remove the power supply without first turning off the power switch
and disconnecting the power cord from the AC outlet.
Use the following procedures to check the power supply.
Checking the LED
If the power supply’s LED is off, check the power switch. If it is off, turn on the
power switch for each power supply in the control unit. Start with the rightmost
carrier and end with the basic carrier. Watch for the following responses:
4-2 Control Unit Problems