Nautel NG1000, Troubleshooting Manual

Page: 43 / 164

NG1000 Troubleshooting Manual Responding to alarms
Issue 0.4 2010-10-12 Page 1-21
PS Distribution PWB Replacement
See Figure
MD-5
(top view) in the Mechanical Drawings section (Section 6) of this manual.
1. Disconnect the associated VHF transmitter’s (A or B) ac power source, disconnect all cabling
from the rear of the transmitter and remove it from the system cabinet.
2. Place the VHF transmitter - top side up - on a suitable work surface. Remove the
transmitter’s top cover, noting it is secured using M3 screws.
3. Remove the power supply modules (U3 and U4) from the transmitter.
4. Disconnect all mating plugs from the PS distribution PWB (A2). Remove the ten wires
(#
13 and 15 through 23) connected to terminal blocks TB1 and TB2.
5. Use a 5.5 mm nut driver to remove the five 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 VHF transmitter.
7. Locate or obtain a replacement PS distribution PWB (Nautel Part # NAPI124). Reverse
Step 1 through Step 6 to reinstall the new PS distribution PWB. If necessary, refer to
Table 3.8 on page 3-7 for connector mating details for A2. The transmitter should resume
normal operation and any associated alarms should clear.
NOTE:
The PS distribution PWB is static sensitive and must be handled in a static protected manner.