Nautel XR12, Руководство по устранению неисправностей, Страница: 41 / 283

XR12 Troubleshooting Manual Responding to alarms
Issue 3.0 2009-07-28 Page 1-21
The fault may be caused by a weak battery, or a fault in the detection or alarm circuitry on the
control/display PWB. If the alarm remains after the battery is replaced, suspect the control/display
PWB circuitry.
Removing and reinstalling RF power modules
Removing an RF power module
Refer to Figure 1.4 on page 1-22 , and Figure 1.5 on page 1-23 for this procedure.
1. An RF power module must be inhibited prior to its removal from the transmitter.
Press and then release the module’s
INHIBIT
switch on the bottom of the module’s front
panel.
• Make sure that the module’s
INHIBIT/TEMP
alarm LED at the top of the module’s front
panel turns on.
2. Disconnect the cable from J1 at the bottom of the module’s front panel. You should hear a
relay in the rear of the transmitter pick up (turn on). If the module is a spare module that was
not selected for operation, no relay pickup will be heard.
3. Remove both mounting screws from the top of the module’s front panel.
4. Remove the mounting screw behind J1 at bottom of the module’s front panel.
5. If the packing bolt at the rear of the module has not already been removed, press
RF Off
,
switch off ac power, remove the upper transmitter cover, then remove the packing bolt.
Make sure to replace the cover before restoring ac power and
RF On
status.
NOTE:
Batteries should be replaced once a year or as soon as weak batteries cause the
Low Backup
Battery
alarm to turn on. This helps prevent chemical dripping from an old battery, and to
ensure adequate backup voltage for the control/display PWB's microcontroller when the ac
power is turned off.
NOTE:
The RF power module will shut down when the
RF FAIL
or
INHIBIT/TEMP
alarms are
registered on its front panel.