Initial Checkout - Data General NOVA 4/S Manual

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.
TROUBLESHOOTING THE 16-SLOT
POWER SUPPLY
WARNING: The VNR unit and power supply board generate
dangerously high voltages. DO NOT ATTEMPT TO MEASURE
VOLTAGES INSIDE THEM. Before you remove the cover on the
VNR unit or the power supply board, WAIT AT LEAST 5
MINUTES AFTER POWERING DOWN THE SYSTEM to allow the
high voltages to dissipate.
To troubleshoot the 16-slot power supply, carry out the
following steps:
2. Indicator light checkout
3. Voltage checkout
4. Final checkout
o. Battery backup checkout
Complete all steps in the order in which they are
presented. (Step 5 is only for systems with battery
backup.) Failure to do so may result in longer system
down time and unnecessary assistance from DGC Field
Service.
Whenever you replace a unit, repeat the check that
indicated a unit was faulty. If the check still indicates
the unit is faulty, replace the original unit before
continuing. Procedures for replacing field replaceable
units are given in Chapter 14.
IMPORTANT: The steps for troubleshooting the power
supply assume the following conditions:
power supply will not produce regulated outputs
so do not troubleshoot the power supply without
at least the CPU board in the chassis.)
e The load on the power supply is balanced. (You
may upset this balance if you remove or add
boards while troubleshooting. See the installation
data sheets. DGC No. 010-000213, for the load
balancing rules.)
e All the electrical connections between units are
e The lock switch on the front console is in the
If you have any reason to think that these conditions
are not met, check them before proceeding.
30
Initial Checkout
1. Turn power off and unplug the chassis ac line cord
from the cabinet.
2. Make sure the cabinet is supplying the proper ac line
3. Plug the line cord back into the cabinet.
4. Swing VNR unit away from backpanel (see "VNR
Unit Replacement," Chapter 14).
3. Make sure the diagnostic test plug is inserted in the
correct location with the RUN label up (see Figure
6. Swing the VNR unit back into position (see "VNR
Unit Replacement," Chapter 14).
'. Remove front panel (see "Front Panel Replacement,"
Chapter 14).
8. Turn the power on.
9. Look at the left side of the chassis through the open
slots and see if all the fans are running. You may
need to remove boards from slots 6 and 15 and use a
flashlight to see the fans.
a. If all four fans are running, reinsert any boards
you removed, and proceed to "Indicator Light
b. If some, but not all, of the fans are running,
replace the faulty fans and make sure the cable
connectors to the fans and the console PCB
assembly are seated securely. (See "Fan and Fan
Module Replacement for 16-Slot Chassis," Chapter
c. If none
of the fans are running, continue