Nautel VX150 - Exciter PWB Replacement

VX150 TO VX2 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS
VERSION 2.0 2023-04-20 PAGE 3.1.37
Exciter PWB Replacement
NOTE: The USB provided with the transmitter contains videos (mp4 format) that support the
replacement procedures in this section. Go to the USB’s HOME screen and click VIDEOS. Videos for
replacing LRUs are listed in the Maintenance section.
See MD-1or MD-2 in the Mechanical Drawings section of this manual for the location of the Exciter
PWB.
1. Turn RF off and disconnect ac power from the transmitter.
2. Disconnect all cables from the rear of the transmitter (noting connections).
3. If applicable, remove and retain the four screws securing the transmitter in the rack.
4. Place the transmitter on a suitable workbench.
5. Remove and retain the SD card from the rear of the transmitter.
6. Remove and retain the 21 M3 screws securing the top cover. Remove cover.
7. Disconnect the five cables from Exciter PWB (six cables if the Orban Audio Processor is installed),
noting connections. See Figure 3.1.4 on page 3.1.38.
8. From the rear of the transmitter, remove and retain the nut and washer from the RF Sample
connector using an 8 mm nut driver.
9. Remove and retain the External Interlock terminal block.
10. Remove and retain the four Jack screws from the two Remote I/O D-sub connectors using a 3/16”
socket or nut driver.
11. Obtain the Knurled Nut Install Tool (Nautel Part # 235-5025), found in the ancillary kit.
12. Remove and retain the two Locking Rings from the 10 MHz In and 1 PPS In BNC connectors using
the Knurled Nut Tool. See Figure 3.1.5 on page 3.1.38.
CAUTION! The Exciter PWB is static sensitive and must be handled in a static
protected manner.