Single LED Fixture 

• Turn off power and lock out the Constant Current Regulator (CCR) before testing.
• Set the multimeter to Diode Test mode.
• Verify test lead orientation — Red to positive (+), Black to negative (–).
• Disconnect the LED light engine from the driver board.
• Touch the Red probe to the + (anode) solder point on the LED circuit board.
• Touch the Black probe to the – (cathode) solder point.
• Observe the LED:
• If it lights up, the LED is functional.
• Some LEDs may appear dim in bright environments — shade the test area if needed.
• Expected reading: 1.7 – 3.0 V DC on the multimeter indicates a good LED.
• If the LED does not light or reads outside range → Replace the light engine.

Multi-LED Fixture

• Fixtures with multiple LEDs use a common circuit board with built-in test points for each LED.
• Each LED must be tested individually at its designated test points.
• Turn off power and lock out the CCR.
• Set the multimeter to Diode Test mode.
• Confirm leads — Red to positive (+), Black to negative (–).
• Disconnect the LED light engine from the driver board.
• Touch the Red probe to the + (anode) test point.
• Touch the Black probe to the – (cathode) test point.
• Observe the LED:
• If it lights up, that LED is functional.
• Dim light under bright conditions is normal.
• Expected reading: 1.7 – 3.0 V DC per LED indicates proper operation.
• Repeat Steps 5 – 8 for each LED on the board.
• If any LED fails the test → Replace the entire light engine.