Northern Telecom BCS35 Replacement Manual page 25

Procedure 2–1
Replacing CPU circuit pack – slot 1
Step Description
1 Get the replacement circuit pack from
the spares kit.
2 Remove the protective electrostatic
bag and place it on a suitable,
grounded surface.
3 Make sure the replacement circuit
pack matches the faulty circuit pack's
part number and has the correct
revision level. Also, make sure the
suspected faulty CPU is in the
standby processor.
4 Remove power from the standby DPP
chassis using the +8 V dc red rocker
switch on the power supply.
5 Remove the suspected circuit pack.
6 Insert the spare circuit pack in the
vacated card slot, making sure it is
fully seated.
7 Apply power to the DPP chassis by
resetting the rocker switch in step 4
above.
8 At the maintenance terminal, enter:
>RSERR STDBY 00 (cr)
CAUTION
Since all DPP circuit packs are static sensitive, be
careful handling them.
Wear a wrist grounding strap. There are jacks at the
lower right of the Rover Interface panel (B chassis)
and the lower right of the Switch and Status Panel
(A chassis) to accept the banana plug connection on
the end of a grounding strap.
(continued)
DPP Card Replacement Guide BCS35 and up
CPU circuit pack
Notes
Verify that any applicable
firmware for the circuit packs
is correct.
A or B, the one with the
suspected fault.
Put it in the empty
electrostatic bag.
Check the revision level and
option settings, if present,
before installation.
Wait for start–up activity to
end and the message,
"S/W Loaded" to print.
To clear any alarms on the
standby processor. Alarms
will clear if there are no faults.
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