Reply to "MTH signal 30-11009"

stan2004OGR Forum Member

Years ago, member fec fan posted this schematic of some MTH signal heads which probably represents what's in the 30-11009.

If this is meaningless to you, maybe you have a buddy handy with a meter and soldering iron that can help you out on a rainy day. For example, IF the green LED dims slightly when the yellow LED is also on, I can see a failure mode where the IC chip (555 SMD on schematic) has a defective "high" output. The chip itself is only 10 cents or so but a nuisance to replace since it tiny.

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12/7/1712:05 PM

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