Nortel DMS-10 Series Installation, Operation And Maintenance Manual page 642

6-204 Section 060-INDP-610 Maintenance Procedures Guide
Procedure 6-47
Power supply (NT6M71AB) replacement
Step Description
169
Put the disk into an Only mode. Enter (at the terminal):
>DISK MODE xx (cr)
where: xx = disk mode
= AO = A ONLY (if you are changing out the B power supply).
= BO = B ONLY (if you are changing out the A power supply).
Proper response:
DISK MODE: AO
or
DISK MODE: BO
170
Enter the following commands to write the value 00 in the DRAM memory address 2204
for the off-line TEC/DSI PCAs:
>DOS S TECMAINT MEMWRITE 1 2204 00 (cr)
>DOS S TECMAINT MEMWRITE 2 2204 00 (cr)
171
Power down the faulty power supply.
Remove power from the standby chassis by operation of the +8 V dc red rocker switch on
the power supply.
172
Remove the -48 V dc source for the standby processor chassis at the main fuse panel;
disk drive in this chassis should now be disabled.
WARNING
Removal of the incorrect -48 V dc source can cause loss of AMA.
Note: This step will cause an alarm.
173
Remove the three connector plugs from the front of the power supply. Squeeze the side
release clips and pull down gently; fold the cables back out of the way.
297-6201-502 Standard 01.02 September 2000
OR
(Sheet 2 of 4)