Northern Telecom BCS35 Replacement Manual page 100

84 DSI circuit pack
Procedure 10–1
Replacing DSI circuit packs (A12,A13,B12,B13)
Step
1
2
3
4
5
6
7
297-1001-536 Standard 01.03 August 1996
CAUTION
Since all DPP circuit packs are static sensitive, be
careful handling them.
Wear a wrist grounding strap when working with the
DPP. 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.
Description
Get the replacement circuit pack from
the spares kit.
Remove the protective electrostatic
bag and place it on a suitable,
grounded surface.
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 DSI is in the standby
processor.
Remove power from the standby DPP
chassis by operation of the +8 V dc
rocker switch on the power supply.
Remove the suspected circuit pack.
Check the revision level and option
settings for the spare circuit pack.
Ensure that the options on the spare
circuit pack match the options on the
removed circuit pack.
Insert the spare circuit pack in the
vacated card slot, making sure it is
fully seated.
1
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.
Refer to Figures 10–1 and
10–2 and Tables 10–1, 10–2,
10–3, and 10–4 for the correct
option setting.
(continued)