Nortel Meridian 1 Replacement Manual page 206

Page 206 of 362
553-3001-520 Standard 16.00 April 2000
Replacing equipment
2 If the multi disk unit (MDU) or floppy disk unit (FDU) is located in the
module, move the unit to the other CPU module:
a Remove floppy disks from the disk drives.
b Tag and disconnect cables to the unit.
c Unhook the locking devices on the unit; pull it out of the card cage.
If you are moving an MDU, pull it forward two or three inches, then
wait at least 10 seconds before you remove the MDU from the card
cage.
d Insert the unit in an acceptable slot in the other CPU module. See
Circuit Card: Installation and Testing (553-3001-211) for slot
assignments.
e Return floppy disks to the disk drives.
f Reconnect cables to the unit.
3 Turn off power to the column or the module power supply:
a With AC power, set the main circuit breaker for the column to OFF
(down) in the rear of the pedestal.
Due to hazardous voltage in AC-powered systems, power to the entire
column must be shut down. This shuts down all functions in the
column.
b With DC power, set the switch on the NT6D41 CE Power Supply to
OFF (down). Set the circuit breaker for just this module to OFF
(down) in the rear of the pedestal. (All other modules in the column
retain power.)
4 Remove the NT8D22 System Monitor in the rear of the pedestal. (Do not
turn off the blower unit in the front of the pedestal.)
CAUTION
WARNING