Data General NOVA 4/C Field Engineering Maintenance Manual page 105

Data General Corporation (DGC) has prepared this manual for use by DGC personnel and customers as a guide to the proper installation, operation, and
maintenance of DGC equipment and software. The drawings and specifications contained herein are the property of DGC and shall neither be reproduced in whole or
in part without DGC's prior written approval nor be implied to grant any license to make, use, or sell equipment manufactured in accordance herewith.
BACKPANEL CENTER BAR
VNR BOX
16-SLOT CHASSIS
BACKPANEL PADDLEBOARD CONNECTIONS
STAND-OFFS
CABLE BRACKETS
Figure 12.19 Paddleboards and terminators
PADDLEBOARD AND
TERMINATOR REPLACEMENT
1. Power down the system.
2. Open the rear cabinet door. If it is a 16-slot chassis, you
must swing the VNR unit out of the way. (See the VNR
Unit Replacement procedure.)
3. A 5-slot chassis does not have any terminators. The
terminators on a 16-slot chassis simply pull off and push
on the backpanel. (Be careful not to bend backpanel pins.)
They must be located on the pins of slot 2 and positioned so
that their connection starts at the center bar of the
backpanel.
4. The paddleboards are mounted on a bracKet on the right
(fan) side of the chassis. They are supported by a pair of
stand-offs between each board and a pair between the first
board and the bracket. You can remove the stand-offs by
Their connectors to the backpanel pull off and push off.
(Be careful not to bend backpanel pins.) They must be
positioned so that their connection starts at the center bar
of the backpanel.
The I/O cables are supported by strain relief brackets.
There are two brackets per chassis. The brackets each
contain one screw on the top to tighten them. The brackets
are adjustable to accommodate different size cables.
5. Reposition the VNR unit if this is a 16-slot chassis. Close
the rear cabinet door and power up the system.
16-SLOT WIRING HARNESS
REPLACEMENT
1. Go to the replacement procedure for the VNR unit and
perform steps 1-9.
2. Remove the 2 screws on cable Pl. Unplug cables P1, P2,
and P3, and remove the wiring harness. (See Figure 12.20
and wiring diagram No. 001-001607.)
3. Plug in cables P1, P2, and P3 of the new wiring harness
in the proper sockets. (See Figure 12.20 and wiring diagram
No. 001-001607.) Replace the 2 screws on cable Pl.
4. Go to the replacement procedure for the VNR unit and
perform steps 12-17.
REFER TO WIRING DIAGRAM NO.
001-001607 FOR MORE INFORMATION.
Figure 12.20 Rear of 16-slot chassis with VNR unit and wiring harness