118 Disk Crossover and Controller circuit packs
297-1001-536 Standard 01.03 August 1996
Procedure 13–1
Replacing Disk XOVR circuit pack
Step
Notes
Description
11
Seat the rear panel. Reinstall the
slotted pan head screws previously
removed.
From step 1. See the note
about screw tightening.
12
Enter: (at the terminal)
>TEST ACT (cr)
Proper response =
DISK TEST PASSED
This is one message that may
appear; see Table 13–1 for
further information. For any
other response, see the
procedure sheet for that
message and perform
activities listed there.
13
Reattach the front panel of the
chassis, if removed.
Replace rear panels for
proper convection cooling.
Notes:
Note 1: Make sure any circuit pack option settings are correct before replacement. Improper
performance can be caused by incorrect settings, and produce faultlike symptoms in the DPP.
Note 2: If the circuit pack at A15 is being replaced, use a Styrofoam block or another insulating
material, about 1" x 1" x .5", to insulate the pins of the 16–pin cable on the P/A Comm circuit pack to
prevent accidental shorting against the chassis.
Note 3: Verify the cable markings (identification) or attach labels to the cables when removing to
facilitate replacement in the correct positions.
Note 4: If the circuit pack has option jumpers or straps that must be set before installation, make sure
the jumpers/straps are set exactly the same as the ones on the circuit pack to be replaced.
Note 5: Make sure the cable(s) are connected properly (pin 1 in the correct position) to prevent data
loss.
Note 6: When replacing the screws, align carefully before tightening to avoid stripping. Tighten the
screws, alternating until all are equally tight. Do not "cinch down" any one screw until all are properly
aligned; no binding or force needed to turn.
End
