Control Data Corporation CDC CC63X Hardware Maintenance Manual page 99

C)
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2. Remove the memory module (ROM pack) and battery from the
rear of the logic drawer assembly, if applicable. Refer
to figure 6B-5 for location.
3. Remove nuts that secure the data set connector to the
rear panel.
4. Unplug the ribbon cable at the main logic board to the
small option mother board and the cable from the power
supply. Remove 20-pin ritibon cable to graphics option.
5. Place the logic drawer assembly so that it is resting on
its rear panel.
6. Release the interlock tabs holding the main logic board
to the logic drawer assembly as follows:
a. Pull b'ottom tabs toward each other and lift board
approximately'one-fourth inch (figure 6B-ll).
b. Grasp board and push up with· hands., Then release top
tabs.
c. Slide main logic board upward and pull it out.
7. Slide new main logic board into the two slots on each end
of the logic drawer assembly, and observe the following:
'a.
Ensure that the data set connector is lined up with
the mating rear panel screw holes.
b. The TEST switch on the rear panel should be lined up
with its cutout.
c. Check the position of the graphics jumper in the area
around the LEOs. Match the new board to the removed
board.
8~
Snap release interlock tabs back into the main"logic
board.
9.
Replace screws on data set connector.
10. Reinsert the memory module ROM pack (if applicable), and
also reirisert the battery.
11. Reconnect ribbon cables and power cable to main logic
board. After installing each cable connector press it
firmly in place to ensure proper seating.
62940034 E
6B-17