Nortel DMS-10 Series Installation, Operation And Maintenance Manual page 632

6-194 Section 060-INDP-610 Maintenance Procedures Guide
Procedure 6-45
Bus Terminator PCA replacement (NT6M68AA) - version numbers H01 or later
Step Description
130
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.
131
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)
132
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.)
133
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.
134
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.
135
From the rear of the IOE frame, insert a sheet of cardboard (approximately 12" x 12" x
1/16") under the left side of the BMC. The cardboard prevents the loss of the screws to
be removed.
136
From the rear of the IOE frame, use a 2 1/2" No. 2 flat-blade screwdriver to remove the
two screws holding the ribbon cable shield. The screws are approximately 2" to the
rear of the BMC mounting bracket. If the BMC shipping bracket is still attached,
remove it for access to the ribbon cable shield screws. Do not reinstall the shipping
bracket or its screws. Store them with other BMC shipping items.
297-6201-502 Standard 01.02 September 2000
(Sheet 2 of 4)