I first replaced icemaker because tested with H and T terminal and did not run. I had repairmain come. He did H and T terminal test and new replacement icemaker did not run. He said it was optics. I replaced optics and they work according to instruction sheet but icemaker still does not run with H and T terminal test. What is left? Water valve and wiring. What makes sense to do next? What could be wrong?
Very good diagnostic procedure Joe. I would add a test to confirm the optics are bad.
If you have a meter, pull the transmitter board off the right side and insert a short paperclip in the black/white pin and another one in the white pin, this makes it easier to measure voltage. If 115 volts there, that would confirm bad optics boards.
— Begin quote from richappy;446093
Very good diagnostic procedure Joe. I would add a test to confirm the optics are bad.
If you have a meter, pull the transmitter board off the right side and insert a short paperclip in the black/white pin and another one in the white pin, this makes it easier to measure voltage. If 115 volts there, that would confirm bad optics boards.
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Rich,
Are you sure ? or is this test on the receiver board pins, in a harvest mode ?
Joe, have no schematic to check, but following Gene’s lead, the output voltage from the optics is on the right side board, black/white wire.
Update; checked Gene’s previous thread. Check the receiver board, pins 4 black/white wire and pin 8 white wire for 115 volts, confirms optics output. If this is true, there should be continuity between these wires and the ice maker wires.
— Begin quote from richappy;450020
Joe, have no schematic to check, but following Gene’s lead, the output voltage from the optics is on the right side board, black/white wire.
Update; checked Gene’s previous thread. Check the receiver board, pins 4 black/white wire and pin 8 white wire for 115 volts, confirms optics output. If this is true, there should be continuity between these wires and the ice maker wires.
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Rich,
Correct, pin #4 blk/wht, is power out to the icemaker, and there would be a closed circuit on both wires, but, there’s no voltage there until the emitter board tells the receiver board, it’s time to harvest and make a batch of ice, if I understand the process, Just a difference in the way we were trained, I guess.
Very hard to measure pins on either connector, so little space. You can use a small neon light from a stove, just stick one wire end in and hold the other one, the bulb will light dimly if there is 115 volts there.
— Begin quote from richappy;483509
Will try this neon bulb. Most very low voltage readings are from some leakage across a break or open contacts. The neon bulb will draw enough current to drop the voltage and fail to light.
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Rich,
I see where you going, and understand, now.