70 Disk Interface circuit pack
297-1001-536 Standard 01.03 August 1996
Procedure 8–1
Replacing the H.P. Disk Interface circuit pack (A11, B11)
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.
Step
Description
Notes
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 pack is in the
standby processor.
Verify that any applicable
firmware for the circuit packs
is correct.
4
Remove power from the standby DPP
chassis by operation of the +8 V dc
rocker switch on the power supply.
A or B, the one with the
suspected fault.
5
Remove the suspected circuit pack.
Put it in the empty
electrostatic bag.
6
Insert the spare circuit pack in the
vacated card slot, making sure it is
fully seated.
Check the revision level and
option settings, if present,
before installation.
7
Apply power to the DPP chassis by
resetting the rocker switch in step 4
above.
Wait for start–up activity to
end and the message,
"Software Loaded" to print.
(continued)
