Nortel Meridian 1 Hardware Replacement Manual page 227

3 Set the ENB/DIS switch to DIS on the card you are removing.
CAUTION
Service Interruption
To avoid interrupting service, set ENB/DIS switches
to DIS before disconnecting or connecting cables.
4 Tag and disconnect cables to the card you are removing.
5 Unhook the locking devices on the card; pull it out of the card cage.
Installing equipment
1 Set the ENB/DIS switch to DIS on the replacement card.
2 Set option switches on the replacement card. If there is a vintage
change, be sure to check Circuit Card: Installation and Testing
(553-3001-211) for any differences.
3 Insert the replacement card into the vacated slot and hook the locking
devices.
4 Connect cables to the replacement card.
5 Set the ENB/DIS switch to ENB on the replacement card.
6 Software enable the card:
ENL CC x
Note: With a vintage H clock controller card, do not issue the tracking
(TRCK) or status (SSCK) commands at this time. If you do issue these
commands, the system may respond with an inaccurate error
condition.
— In a single-CPU system, complete the replacement procedure by
exiting LD 60:
****
— In a dual-CPU system proceed with the following steps.
7 Switch CPUs:
LD 135 (for Options 51C, 61C, 81, and 81C)
SCPU
****
Replacing equipment
Hardware Replacement
Page 227 of 250