Nautel NX15, Troubleshooting Manual

Page: 63 / 274

NX25/NX15 Troubleshooting Manual Responding to alarms
Issue 5.0 2016-05-06 Page 1-55
Remote interface PWB replacement
1. Remove and retain six sets of mounting hardware from the remote interface PWB (A11A4).
2. 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.
3. Set the
STATUS/ALARM
jumpers (E1 through E16) on the new remote interface PWB to the
same positions as the defective PWB.
4. 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.
5. Install the new remote interface PWB by reversing Step 1 and Step 2 .
6. Reconnect all interface wiring to the new remote interface PWB.
Digital AM exciter PWB replacement
1. Set the transmitter to its
RF Off
state.
2. Connect a cable between the defective digital AM exciter PWB’s RS-232 connector (9-pin D-
sub J3, see Figure 1.7 on page 1-55 ) and a PC.
Figure 1.7: Part of Digital AM Exciter PWB - Location of RS-232 Connector J3
3. On
MODE
program header E1 (see Figure 1.7 ), install the shorting jumper in the
PROGRAM
position (shorting pins 1 and 2). Press
RESET
switch S1, located directly above E1.
4. From the PC, run the NCode Uploader application (see Figure 1.8 ). Click
Settings
and
ensure the COM port reflects the port that the serial cable is connected to on your PC.
C5
0
C4
8
L10
C3
9
C4
9
C4
6
R5
7
C3
6
R51
R60
R58
R75
R74
U22
C6
1
R82
R98
C69 C77
R96
R95
C3
7
C3
5
C40
P3
R59
U1
7
U1
8
L12
C6
2
C6
0
R83
TP9
E1
1
R71
R78
Y3
R97
TP4
R50
R5
2
J5
1
TP7
C45
U26
U3
6
R72
R73
C63
C42
U1
4
S1
U3
4
1
J3
+2.5V
GND
ND
+1.2V
RS-232
BOOTLOADER
NORMAL
MODE
RESET
PROGRAM