Northern Telecom BCS35 Replacement Manual page 114

98 Replacing bus terminator circuit pack
Procedure 11–2
Replacing bus terminator circuit pack – models H01 and later
( H02 or I01, for example),
Step
1
2
3
4
5
6
7
8
9
297-1001-536 Standard 01.03 August 1996
Description
First get the DPP's model number
from the DPP nameplate, A chassis,
rear panel.
Two people must reinstall the ribbon
cable shield with a 2–1/2–inch No. 2
flat–blade screwdriver.
Remove the front cover of the DPP
chassis.
Set the status of the active processor
to ONLY.
Press the processor A/B Select
Switch to the position (A or B) that
matches the active processor.
Turn the Mode Switch.
Make sure the active processor unit
ONLY status lamp lights.
Power down the standby chassis.
CAUTION
Since all DPP circuit packs are static sensitive, be
careful when handling them.
Remove the cables from the front of
the circuit packs at positions 12 and
13.
Remove the DSI circuit packs (slots
12 & 13) and the Disk Interface circuit
pack (slot 11).
Notes
WARNING:
Perform during low traffic.
Press the O/P Mode Switch to
the ONLY position for the
active processor.
Turn to the right and release.
1
Cable on left goes to position
A12; cable on right goes to
position A13.
This is to make room. Identify
the DSI circuit packs to know
which slot to return them.
(continued)