Interface Pca Replacement Procedure (Nt6M94Xx); Interface Pca (Nt6M94Xx) Replacement - Nortel DMS-10 Series Quick Reference Manual

56K Interface PCA Replacement
Procedure (NT6M94xx)
Procedure 10
56K Interface PCA (NT6M94xx) replacement
Step
CAUTION
Since all BMC PCAs are static sensitive, be careful when
handling them. Wear a wrist grounding strap when working
with the BMC.
WARNING
Since the BMC is powered up during this procedure,
observe all safety procedures for operations on live equip-
ment.
1 To remove the front panel of the BMC II, loosen the four
screws located on the left and right hand sides. Once removed,
put the front panel in a safe place to avoid damage; bending and
scratching.
2 Get the replacement 56K Interface PCA from the spares kit.
3 Remove the protective electrostatic bag and place it on a suit-
able, grounded surface.
4
Make sure the replacement PCA matches the faulty PCA's part
number and has the correct revision level. Also, make sure the
suspected faulty PCA is in the standby processor.
Verify that any applicable firmware for the PCA is the same or
with a higher release number. Otherwise, contact your next
level of support.
5 Place the processor unit with the suspected faulty PCA in the
standby mode, by putting the other processor in the ONLY
mode. The other processor is defined as that processor that
does not have the suspected faulty PCA. At the Switch and
Status Panel of the BMC:
a. Press the A/B Select Switch to match the other processor.
b. Press the O/P Mode Select Switch to O.
c. Turn the Mode Switch to the right and release.
Note: This will create an alarm.
6
Enter the following commands to write the value 00 in the
DRAM memory address 2204 for the off-line DSI/TEC PCAs:
>DOS S TECMAINT MEMWRITE 1 2204 00 (cr)
>DOS S TECMAINT MEMWRITE 2 2204 00 (cr)
Description
BMC II AMAT Quick Reference Guide
57