Nautel VS1, Troubleshooting Manual

Page: 54 / 109

VS1 Troubleshooting Manual Responding to alarms
Page 1-46 Issue 10.0 2018-10-29
PS Distribution PWB Replacement
See Figure
MD-1
(top view) in the Mechanical Drawings section (Section 6) of this manual.
1. Remove the transmitter’s top cover. Retain hardware for re-installation.
2. Temporarily remove the power supply module (U2) from the transmitter (see “Power Supply
Module Replacement” on page 1-39 ).
3. Disconnect ribbon cable plugs W2P2 and W4P2 and quick-disconnects P7 and P8 from the
PS distribution PWB (A2). Remove the nine wires [(# 10, 11, 12, 13, 14, 16, 18, 20 and 22)
connected to terminals E3 and E5 and terminal blocks TB1 and TB2.
4. Remove the two screws that secure the cover to connector A2J1. Retain the cover and
screws.
5. Use a 5.5 mm nut driver to remove the six M3 nuts, split and flat washers that secure the PS
distribution PWB to the transmitter. Retain hardware.
6. Remove the PS distribution PWB from the transmitter.
7. Locate or obtain a replacement PS distribution PWB (Nautel Part # NAPS41A). Reverse
Step 1 through Step 6 to reinstall the new PS distribution PWB. If necessary, refer to the
Wiring Lists section (Section 4) for wiring and connector mating details for A2. Torque
connections on TB1 and TB2 to 6 inch pounds (0.67 Newton-meters). Torque connections
on E3 and E5 to 20 inch pounds (2.24 Newton-meters).
8. Reinstall the transmitter’s top cover.
9. Re-install the transmitter in its host cabinet, reconnect all interconnect cables and restore
operation by enabling ac and RF power.
NOTE:
The PS distribution PWB is static sensitive. Handled it in a static protected manner.