Nautel NX50, Troubleshooting Manual

Page: 76 / 205

NX50 Troubleshooting Manual Responding to alarms
Page 1-66 Issue 6.0 2019-04-01
Remote interface PWB replacement
1. Set the transmitter to its
RF Off
state. Open the front door to gain access to the exciter
panel (see Figure 1.9 on page 1-65 ).
2. If applicable, label each of the connectors connected to the remote interface PWB to
indicate their connection point.
3. Disconnect each of the terminal block connectors from the remote interface PWB.
4. Remove and retain six sets of mounting hardware from the remote interface PWB
(A11A4).
5. Pull the remote interface PWB away from the control/interface PWB (A11A1). It may
be helpful to gently pry the connector loose with a screwdriver.
6. Set the
STATUS/ALARM
jumpers (E1 through E16) on the new remote interface PWB to
the same positions as the defective PWB.
7. Use an indelible marker to identify the LED and switch labels on the new remote
interface PWB to match the labels on the defective PWB.
8. Install the new remote interface PWB by reversing Step 3 to Step 5 .
9. Reconnect all interface wiring to the new remote interface PWB.
Digital AM exciter PWB replacement
1. Set the transmitter to its
RF Off
state. Open the front door to gain access to the exciter
panel (see Figure 1.9 on page 1-65 ).
2. Connect a straight-through serial (DB9) cable between the defective digital AM exciter
PWB’s RS-232 connector (9-pin D-sub J3, see Figure 1.10 ) and the serial port on a PC.
See Figure 1.9 on page 1-65 to locate the digital AM exciter PWB(s) (A11A2 and
A11A3).