Shot clock constantly having components fail or burn up.

Symptoms

  • Since the BB-2115 was installed:
    • Relay board caught fire.
    • Resistor burnt on Horn interface card.
    • Driver went bad [voltage for horn output on J7 was 8vAC instead of 16vAC, dimming at NONE]
    • Driver shows signs of burning where the [Grounded] metal standoff meet the driver.
    • Bridge Rectifier shows signs of thermal grease burning.

Environment

  • BB-2115-15, MDP (120V)
  • HORN INTERFACE; 5-35V IN, 120VAC OUT
  • LED DRIVER II; 16 COL

Cause

  • The incoming voltage twist lock connector P41 was wired wrong.  The hot and neutral were reversed.

Resolution

  • Rewired twist lock connector, hot to the gold terminal and neutral to the silver terminal.

KB ID: DD2964779


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