Problem with the undercarriage

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I am having a problem with my undercarriage staying on for only 6 seconds when it should stay on for 30 seconds.  So the culprits are the entry banner eyes, what is weird is the eyes are giving 2 pulses when the eyes are blocked once.  I swapped the eyes with the front treadle eyes and the undercarriage worked perfectly.

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The Water Wizard uses the same Banner eyes for the front (treadle) and the back (entry, undercarriage).  These eyes are in pairs with one receiver and a super duper laser emitter.  The Banner emitter is the SM306EQ and the receiver is the SM30SN6RQ.