Nortel Meridian 1 Replacement Manual page 270

Page 270 of 362
553-3001-520 Standard 16.00 April 2000
Replacing equipment
— QPC477-B10 BTUs must be used in NT6D60 Core Modules.
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.
1 Turn off power to the module:
— With AC power, set the circuit breaker on the Module Power
Distribution Unit (MPDU) to OFF (down).
— With DC power, set the switch on the power supply to OFF (down).
2 Remove enough cards on both sides of the BTU to access the unit.
See Circuit Card: Installation and Testing (553-3001-211) for BTU slot
locations.
3 Gently pull the BTU out of the card cage.
4 Insert the replacement BTU into the vacated slot.
5 Reinstall the cards on both sides of the BTU.
6 Turn on power to the module:
— With AC power, set the MPDU circuit breaker to ON (up).
— With DC power, set the power supply switch to ON (up).
Note: As necessary, software reenable cards in the module. See the
appropriate replacement procedures in this document.
7 Tag defective equipment with a description of the problem and package
it for return to a repair center.
WARNING