Nortel DMS-10 Series Quick Reference Manual page 56

46 Error Control II PCA Replacement Procedure (NT6M65xx)
Procedure 5
Error Control II PCA (NT6M65xx) replacement
Step
8 On the Error Control II Jumper PCA in the B chassis (Slot 5),
pull the toggle switch outward and lift the switch to the up
position.
Note: The CRIT will be the only lamp lit on the status panel.
This switch serves a dual function. First, it removes the B
chassis power-feed from the Error Control II PCA in the A
chassis. Second, it locks the error control functions to the B
chassis.
9 Remove the Error Control II PCA in the A chassis (slot 5).
10
Insert the spare Error Control II PCA in the A chassis (slot 5),
making sure it is fully seated.
11 Put faulty PCA in the empty electrostatic bag.
12
Apply power to standby chassis (A processor) by operation of
the +8 V dc red rocker switch on the power supply.
Wait for start-up activity to end and the message, Software
Loaded or S/W Loaded to print. For Turbo BMCs and Non-
Turbo BMCs with 1 GB disk drives, wait for the CP S/W
Loaded message to print.
13
Return the toggle switch on the Error Control II Jumper PCA in
B5 to the down (LED off) position. This unlocks the Error
Control functions. The B processor may print out this message:
EC-IC-ALM (this is normal)
14
To clear any alarms on the standby processor. At the mainte-
nance terminal, enter:
>DOS S RSERR 00 (cr)
Alarms will stay clear on the standby processor if there are no
faults.
15
To clear any alarms on the active processor. At the mainte-
nance terminal, enter:
>RSERR 00 (cr)
Alarms will clear if there are no faults.
16 Place the active processor unit in PRIME mode. At the Switch
and Status Panel of the BMC: \
a. Press the A/B Select Switch to B.
b. Make the O/P Mode Select Switch P.
c. Turn the Mode Switch to the right and release.
17 When all maintenance activities are complete, be sure to
replace the front panel of the BMC.
Carefully line up the four captive screws of the front panel with
their mounting holes. Tighten the captive screws; but do not
bear down.
The procedure is complete.
297-6201-500 BMCA001 and up
Description
Standard 02.01 July 1997