Nautel NX50, Troubleshooting Manual, Page: 81 / 205

NX50 Troubleshooting Manual Responding to alarms
Issue 6.0 2019-04-01 Page 1-71
21. 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.
22. Set the transmitter to its
RF On
state. Ensure any previously present alarms have
cleared.
GPS Sync PWB replacement
1. Set the transmitter to its RF Off state. Turn off (disable) the ac power at the source.
Open the front door to gain access to the exciter panel (see Figure 1.9 on page 1-65 ).
2. Disconnect all cables attached to the GPS sync PWB (A5), taking note of the connector
labels on the cables and the PWB.
3. Carefully remove and retain four (4) sets of mounting hardware from the GPS sync
PWB from the exciter panel.
4. Obtain a replacement GPS sync PWB (Nautel Part # NAPX46). Remove the jack
screws from 9-pin D-sub connector J1 on the new GPS sync PWB before installing it.
5. Set the jumpers on the replacement PWB to the same positions as the defective PWB.
6. Install the new GPS sync PWB by reversing Step 2 and Step 3 . Ensure all connections
are tight. For connector mating assistance, refer to the connector mating tables in
Section 3, “Wiring/connector lists” on page 3-1 .
7. Turn on (enable) the ac power source. Set the transmitter to its RF On state. Ensure
any previously present alarms have cleared.
USB Audio Interface PWB replacement
1. Set the transmitter to its RF Off state. Turn off (disable) the ac power at the source.
Open the front door to gain access to the exciter panel (see Figure 1.9 on page 1-65 ).
2. Disconnect all cables attached to the USB audio interface PWB (A6), taking note of the
connector labels on the cables and the PWB.