Nautel GV10, Troubleshooting Manual

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GV10/GV7.5 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS
PAGE 4.1.74 VERSION 3.2 2016-03-10
6. Obtain a replacement power supply interface PWB (Nautel Part # NAPI150A) and install it by
reversing the instructions in
Step 1 through Step 5 .
7. Re-install the power supply modules.
8. Enable and turn on ac power to the transmitter.
9. Return the transmitter to service.
UPS Interface Power Supply Replacement
See Figure 4.1.31 on page 4.1.75 .
1. Turn off and lock out the transmitter’s main ac power.
2. Remove the rear top panel (GV3.5 to GV20) or rear, right-hand top panel (GV30, GV30N and
GV40) which are secured with 1/4-turn fasteners.
3. From the rear of the transmitter:
 Disconnect the power cable to the UPS Interface assembly by removing the 220 Vac plug
(Nautel Part # JD43) from the UPS Interface assembly at J1.
 Remove the six M4 screws that secure the UPS Interface to the transmitter and retain.
Disconnect the wiring from the terminal block on the defective power supply (Nautel part #
UG31), noting connections
.
 Remove the UPS Interface assembly from the transmitter to gain access to the four M4 screws
that secure power supply from underneath. Remove the four M4 screws and retain.
4. Obtain the replacement power supply (Nautel Part # UG31) and install in the UPS assembly using
the four M4 screws retained in step 3. Apply ac power to the UPS interface only. Use a DMM to
monitor the dc voltage between the +V and -V terminals of the UG31. Adjust the power supply
output voltage potientiometer until the DMM reads 30 Vdc.
5. Install the UPS Interface assembly in the transmitter by reversing the instructions in steps 2 and
step 3.
6. Enable and turn on ac power to the transmitter.
7. Return the transmitter to service.
CAUTION! There are high voltages present. It is recommended to use a shrouded
adjustment tool to avoid shorting the ac voltage to the chassis.