Nortel Meridian 1 Replacement Manual page 113

8 Tag the defective rectifier with a description of the failure symptoms and
package it for return to a repair center.
Installing equipment
1 Position the replacement rectifier in the rack. Replace the rack mounting
screws and the two sheet metal screws that secure the baffle assembly to
the bottom of the rectifier.
2 Remove the rear cover from the replacement rectifier.
3 Remove the conduit fitting that is installed below TB3 in the replacement
rectifier; it will not be used.
4 Remove the switch locking bracket from the 220 V/110 V switch (SW1
on the front of the rectifier) and set the switch to match the commercial
power source. Make sure the bracket is properly reinstalled to prevent
the switch from being operated.
5 Remove the safety shield from TB3.
6 Carefully insert the wires and conduit fitting from the QBL15 into the
hole below TB3 and secure the fitting to the chassis with a nut.
7 Reconnect the wiring from the QBL15 to the rectifier as follows (see
Figure 10):
a Connect the #4 AWG black wire to terminal 2 on TB3 (48 V return).
b Connect the #4 AWG red wire to terminal 1 on TB3 (– 48 V).
c For systems without battery backup:
– Make sure that the two factory-installed jumpers are properly
connected to TB4, one from + OUT to +SENS and the other from
– OUT to – SENS.
For systems with battery backup:
– Remove all jumpers from TB4; they will not be used.
– Connect the #22 AWG black wire to the + SENS terminal on
TB4.
Replacing equipment
Hardware replacement
Page 113 of 362