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PaulG
look at the possibility that the relays control the trucks SCR speed controllers. Also look closely at the tips of the power relays not seating completely. Are you hearing a SCR hum? Yes the print board does gate on the Rectifiers of the speed control unit.
  • Posted 27 Jun 2014 14:42
  • By MEngr
  • joined 15 Jan'11 - 247 messages
  • Missouri, United States

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Movers & Shakers
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President EPG Americas, Ehrhardt Partner Group (EPG)
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Fact of the week
Foundling hatches are safe, anonymous drop-off points for unwanted infants, allowing parents in crisis a way to surrender a baby safely without fear of punishment, ensuring the child is rescued and cared for. The concept started in the 12th century, was abandoned in the late 19th century, then reintroduced in 1952. It has since been adopted in many countries.