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NG1000 Troubleshooting Manual
Responding to alarms
Page 1-26
Issue 0.4 2010-10-12
RF Coaxial Switch Replacement
See Figure
MD-1
in the Mechanical Drawings section (Section 6) of this manual.
1. Turn off the transmitter system and disconnect (or disable) its ac power sources.
2. Open the system cabinet’s rear door and locate the RF coaxial switch (U1) mounted near the
top of the cabinet.
3. Disconnect four coaxial cables (W5P2, W6P2, W7P1 and W8P1) and 9-pin D-sub connector
W3P2 from the RF coaxial switch.
4. Remove the switch bracket, noting it is secured using M4 hardware. Retain hardware to
install the new switch on this bracket.
5. Locate or obtain a replacement RF coaxial switch (Nautel Part # KC78). Reverse
Step 1
through
Step 4
to reinstall the new RF coaxial switch. If necessary, refer to
Table 3.4 on
page 3-3
for connection details. The transmitter system should resume normal operation and
any associated alarm should clear.
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