- 1). Access the Optocoupler circuit by removing the housing from the motherboard to which the circuit is attached.
- 2). Locate the circuit on the board. It can be identified as a rectangular circuit with three or four pins on each side.
- 3). Power on your digital multimeter and turn the dial to "V" so that it reads in volts.
- 4). Insert the red lead into the "+" port on the multimeter and the black lead into the "-" port on the multimeter.
- 5). Touch the red lead to one of the pins on the optocoupler.
- 6). Touch the black lead to a non-electric surface. This will ground it.
- 7). Wait for the display to produce a reading. This will detail the power in the circuit.
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