Nt8D06, Nt8D21, Nt8D29 Power Supply Ac - Nortel Meridian 1 Replacement Manual

NT8D06, NT8D21, NT8D29 Power Supply AC

Use this procedure to replace AC power supplies:
• NT8D06 PE Power Supply AC
• NT8D21 Ringing Generator AC
• NT8D29 CE Power Supply AC
Module covers are not hinged; do not let go of the cover. Lift the cover
away from the module and set it out of your work area.
Removing equipment
1 Turn off power to the module power supply:
— If there is a Module Power Distribution Unit (MPDU), set the circuit
breaker(s) on the associated MPDU to OFF (down).
Note: If there are two circuit breakers on the MPDU, the top one is
associated with the module power supply, the bottom one with the
ringing generator (see Figure 13).
— If there is no MPDU, set the switch on the power supply faceplate to
OFF (down).
2 Unhook the locking devices on the power supply. Wait at least 5 minutes,
then pull the power supply out of the card cage.
Power must discharge. Wait five full minutes before you remove the
power supply from the module.
Replacing equipment
WARNING
CAUTION
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Hardware replacement