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946261-9701
Installing a disk controller in a location other than slot 7 requires that the TILINE access granted
jumper
(P2-5
to
P2-6)
be removed from the chosen slot, and that the continuity of the TILINE ac-
cess granted lines between the highest priority master and the central processor· board must be
preserved. This means that if an intermediate slot is assigned to
a
TILINE master, that master must
be installed to preserve continuity and to allow the priority system to function.
Current production assemblies have the TILINE access granted jumpers accessible from the connec-
tor side of the motherboard when all boards are removed from the chassis. These jumpers are shown
in Figures
2-22
and
2-23.
Simply remove the jumper plug (or cut the jumper, if the jumper is a wire)
for the selected chassis slot, and reinstall all circuit boards in their proper location. As noted
previously, the continuity of the TILINE access granted line from the highest TILINE master to the
central processor must be preserved. Therefore:
1.
All slots other than those containing TIliNE master controllers must have the TILINE
access jumper installed.
2.
All master controllers must be installed in their proper location.
If the chassis is an early production version (Le.
t
if it does not have jumpers as shown in Figures
2-22
or
2-23),
it is necessary to remove the back cover and power supply to gain access to the TILINE ac-
cess granted jumpers. For these chassis, the following steps should be followed:
1.
Tum
off
an
power and unplug the computer ac line cord.
WARNING
Lethal voltages are exposed when the access cover is removed. Power
supply capacitors may retain charges long after ac power is removed.
2.
Remove the left access cover (as viewed from the front of the chassis). The cover is
fastened by four or six hex head machine screws.
3.
If the chassis is a· 13-slot chassis with a 20-ampere power supply, slots 1 through 6 are
visible above' the power supply. To work on these slots, proceed to step 4. To work on"
any other slots, remove the power supply as follows:
a.
Disconnect the color-coded connectors from the component side of the power
supply board.
b.
Unscrew the machine screws and standoffs that secure the power supply to the
frame and to the motherboard.
c.
Carefully pull the power supply board straight forward until the connector at the
bottom center of the power supply board is disengaged from the pins protruding
from the motherboard. Lift the power supply board out of the chassis.
2·30
Digital Systems Division
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