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NG1000 Troubleshooting Manual
Responding to alarms
Issue 0.4 2010-10-12
Page 1-29
ROAMS Unit Replacement
See Figure
MD-1
in the Mechanical Drawings section (Section 6) of this manual.
1. Open the system cabinet’s rear door and locate the ROAMS unit (U6) mounted below the
system controller (A1).
2. Disconnect the power connector (U7P2) and the I/O connector (P6) from the back of the
ROAMS unit.
3. Remove the three screws above the ROAMS unit that secure the ROAMS mounting bracket
to the system cabinet. Retain this hardware for re-installation.
4. Remove the mounting bracket from the ROAMS unit, noting it will be required to mount
the new ROAMS unit.
5. Locate or obtain a replacement ROAMS unit (Nautel Part # UX134). Remove its front
panel to allow installation of the mounting bracket. Reverse
Step 1
through
Step 4
to reinstall
the new ROAMS unit.
Dummy Load Replacement
See Figure
MD-1
in the Mechanical Drawings section (Section 6) of this manual.
1. Turn off the standby transmitter or open its interlock circuit by removing the wiring from
the
INTERLOCK
connector (A1J4) on the rear of the standby transmitter.
2. Disconnect the coaxial cable connected to J1 of the dummy load (U3).
3. Using two 13 mm sockets or wrenches, remove the dummy load from its support bracket,
noting it is secured using using M8 hardware. Retain hardware to install the new dummy load
on this bracket.
4. Locate or obtain a replacement dummy load (Nautel Part # DA98). Reverse
Step 1
through
Step 3
to reinstall the new dummy load. The transmitter system should resume normal
operation and any associated alarm should clear.
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