Nortel DMS-10 Series Installation, Operation And Maintenance Manual page 628

6-190 Section 060-INDP-610 Maintenance Procedures Guide
Procedure 6-44
Bus Terminator PCA replacement (NT6M68AA) - version numbers G12 or earlier (e.g., D09 or
E12)
Step Description
104
Place the processor unit with the suspected faulty pack 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 pack. 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.
105
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)
106
Remove power from the standby BMC chassis by operation of the +8 V dc red rocker
switch on the power supply.
(A or B, the one with the suspected fault.)
107
Remove the cables from the front of the TEC/DSI PCAs (slots 12 and 13). Cable on the
left goes to slot 12; cable on the right goes to slot 13.
108
Remove the TEC/DSI PCAs (slots 12 and 13) and the SCSI Interface PCA (slot 11).
Removing these packs creates room. Identify the TEC/DSI PCAs to ensure that they
are returned to the correct slot.
109
Remove the two screws from the ribbon cable shield. Save the screws and shield.
110
Hold the cables out of the way. Remove the suspected faulty Bus Terminator PCA
(using firm, even pressure) by inserting a finger in the hole in the circuit pack.
111
Insert the replacement Bus Terminator PCA. This pack requires high insertion force for
proper seating. Use a thimble or other mechanical aid.
112
Put faulty pack in the empty electrostatic bag.
297-6201-502 Standard 01.02 September 2000
(Sheet 2 of 4)