Specifications

Hard Disk Drive
Installing this option requires access to the bottom side of the Signal
Chassis. If it is installed in a rack that does not allow screwdriver access
to the chassis bottom, remove it from the rack and place it on a suitable
workbench.
Before proceeding, ensure that you have the following items:
One 3.5" 1GB SCSI disk drive, Accom P/N 1600-0075 (initialized and
formatted by Accom).
One 50-way ribbon cable, Accom P/N 9000-0518-00.
One 4-way power cable, Accom P/N 9000-0515-01.
Four 6-32 x 1/4" Phillips screws, Accom P/N 1901-0071.
Four 5/16" diameter #6 Star washers, Accom P/N 1901-0182.
WARNING: Removing the Switcher board
disconnects the RAM battery backup. Save all
effects, timelines, personality files, and
engineering setups to disk before extracting the
board.
STEP 1: Power down the Signal Chassis. Remove the integral front
cover/air filter to access the Switcher board. Use the Accom
supplied tool to extract the Switcher board from the chassis
and set it aside on a clean, static free surface.
STEP 2: If you originally received your 8100 (or 8150) during or after
March 1995, skip to step 4. If you received your 8100 during
or before February 1995, use the next step to verify that a
modification is in place.
STEP 3: On the component (top) side of the Switcher board, locate the
voltage regulator at location UAA20. Verify that its heatsink
faces up, away from the circuit board, and that the
silkscreened side of the component faces the circuit board. If
so, the modification is present. If the regulator at UAA20 has
the heat sink facing the board and the silkscreen facing away
from the board, it must be modified for the SCSI circuitry to
work properly. Contact Accom for an update kit at no charge.
8150 Technical Guide Option Installation
9100-0212-04 - May 2000
Option Installation
3-27