Nautel NX50, Troubleshooting Manual

Page: 87 / 205

NX50 Troubleshooting Manual Responding to alarms
Issue 6.0 2019-04-01 Page 1-77
6. Remove the Rack Interface PWB from the transmitter. You may notice some
resistance as the PWB disengages from the three (3) D-sub connectors on the front edge
of the board which mate to the power module interface PWBs.
7. Obtain a replacement Rack Interface PWB (Nautel Part # NAPI152C) and set DIP
switch S1 as follows:
8. Reverse Step 2 through Step 6 to reinstall the PWB. Ensure all connections are tight
taking special precaution to verify the three (3) D-sub connectors mentioned in Step 6
are fully mated. It may be helpful to verify prior to re-installing the RF Drive
Distribution PWB. For connector mating assistance, refer to the connector mating
tables in Section 3, “Wiring/connector lists” on page 3-1 .
9. Disengage all RF power modules in the transmitter before turning on the ac power (see
“Removing and reinstalling RF power modules” on page 1-51 ).
10. Close and lock the rear door. Enable (switch on) the ac power for the transmitter.
11. One at a time, insert an RF power module and wait for the LED sequence on the front
panel change to solid red. Reconnect the RF power module’s PDM cable; the LED
sequence should change to flashing amber.
12. Upgrade the subsystem software using the AUI’s
Upgrade Software
page under the
System Settings
menu by running an upgrade using the existing .tgz file already
installed on the transmitter. See the NX50 Operations and Maintenance Manual for
detailed instructions.
13. Set the transmitter to its RF ON state. Ensure any previously present alarms have
cleared.
S1 Position A6 Setting
8 CLOSED
7 CLOSED
6 OPEN
5 CLOSED
4 CLOSED
3 CLOSED
2 OPEN
1 OPEN