Manual Testing - Data General NOVA 4/C Field Engineering Maintenance 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.
Chapter 8
MANUAL TESTING
Chapters 3 through 7 of the troubleshooting section should
isolate most malfunctions associated with the NOVA 4/C
computer. The remainder of the troubleshooting is directed
to system problems, namely, input/output.
DTOS LOADING FAILURE
If you cannot load DTOS as specified in Chapter 7, follow
the steps listed below. If a fault is found as you proceed
through the steps, take corrective action and attempt to
1. Disconnect the loading unit (disc or tape drive) and
power it up off-line.
Refer to the documentation for the device. Check to
ensure that all functions that can be performed off-line
are responding properly. (For example, load the tape
drive with a scratch tape and advance the tape to the
beginning of tape position; advance the tape; rewind
it.) If the unit fails to perform properly, either
troubleshoot or replace the unit.
2. Examine the device cable. Is it connected properly?
Are there any loose wires? If so, replace the device
3. Examine the condition of the paddleboard cable and
connectors. If they appear to be without fault, slip the
paddleboard connectors off the appropriate backpanel
pins and then reinsert them, making sure they are
properly seated.
4. Replace the CPU board.
9. Replace the bus terminators (16-slot chassis only).
6. Replace the controller board if the unit is operating
properly off-line and the device cable and paddleboard
assembly appear to be in good condition and properly
7. Move the controller board to a different slot, making
sure the priority chain is maintained by inserting
jumpers across the open slot. See the 5- or 16-slot
8. Replace the paddleboard assembly and the device
If the above procedures fail to repair the malfunction, call
DGC Field Service for assistance.
RELIABILITY/DIAGNOSTIC TEST
FAILURE
Successful completion of the CPU self-test and the loading
of DTOS indicates that the main portion of the NOVA 4/C
computer is operating properly and the input/output
transactions between the disc (tape) drive controller, the
CPU and memory were accomplished without fault.
After replacing the field replaceable units specified in
Chapter 7, follow the steps listed below.
1. Remove all I/O controllers from the chassis, except
the disc (tape) drive controller that is used as the DTOS
loading device. Make sure the priority chain is
maintained on the backpanel by placing jumpers across
the slots that previously held I/O controllers. See the
o- or 16-slot installation data sheets. Also, make sure
the load balancing rules for the 16-slot chassis are
followed as shown in the 16-slot installation data sheets.
2. Remove the paddleboard connectors on the backpanel
for all unused I/O controllers.
3. Load DTOS and run the failing reliability or diagnostic
test.
4. If the test passes, add one I/O controller with its
associated paddleboard connectors and rerun the test.
Continue adding I/O controller boards until you isolate
the malfunctioning controller.
If the above steps fail to correct the problem, call DGC
Field Service for assistance.