Data General NOVA 4/C Field Engineering Maintenance Manual page 99

REPLACEMENT FOR 16-SLOT
CHASSIS
1. Power down the system and remove the front panel.
(See Front Panel Replacement procedure.)
2. Remove the fan module. (See Fan and Fan Module
Replacement procedure steps 3-4.)
3. Remove 3 screws, 2 on the top of the console PC board
casing and 1 on the bottom. (Each screw has 1 lock washer.)
PC BOARD
CASING
Figure 12.9 Console PC board casing (16-slot chassis)
4. Unplug cable P1 on the back of the console PC board.
5. Remove the 4 screws which mount the PC board to its
stand-offs. (Each screw has 2 lock washers.)
6. Mount the new PC board and replace the screws and
lock washers.
7. Plug cable P1 into the new PC board.
8. Replace the 3 screws and lock washers on the PC board
9. Replace the fan module and the front cover.
(2 ON TOP, 1 ON BOTTOM)
Figure 12.10 Removing the console PC board (16-slot chassis)