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			SIGM20: My signals aren't responding as expected		</h2>
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<p>The following causes have been found to cause problems with the SIGM20:</p>
<ol>
<li>Is the LocoNet cable plugged into front of UP3 or similar utility panel? The front connectors are suitable only for throttles because the rail_sync signals (a version of the DCC track signal) is not passed out to the front connectors. The LocoNet cable must always be connected to the rear connectors.</li>
<li>Are the LocoNet cables OK? We are aware of several instances where a LocoNet cable that passes a test with an LT1 tester is actually high resistance, affecting the messaging.</li>
<li>Is the jumper JP1 on the board removed? These should be REMOVED for normal operation, and only inserted for programming on a programming track.</li>
<li>Is the board's green LED lit? If not, this suggests a problem with LocoNet cabling, or the track power is currently switched off.</li>
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