Question about Chauvet Dmx-4 4 Channel Dmx Dimmer Relay Pack $0ship

1 Answer

DMX function appears to have failed, stand alone chase working fine. Controller panel functions well with other units. Item: DMX-4 dimmer pack.

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  • don1572 Mar 18, 2011

    Thanks, but with or without the terminator no DMX, changing the address doesn't seem to help either. Are there schematics of the circuitry anywhere? Is it possible that the DMX chip is fried leaving the Chase circuitry intact? i.e are they two separate entities?

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  • Chauvet Master
  • 5,603 Answers

Make sure you have the correct address dialed in for the unit and the mode.

If this is on a long cable, read about "terminating resistor" that is sometimes needed to avoid reflection on the DMX daisy chain that can cause random effects.

Try using a different address with the unit as well.

Posted on Mar 18, 2011

Testimonial: "Thanks Fredy2... I was wondering about why I would have the chase and not the DMX. I fear my DMX circuitry is blown on this unit. Much appreciated."

  • Fred Yearian Mar 18, 2011

    The processor will be all in one chip... however the interface circuitry for the DMX input might be in question. Getting schematics is rare for any of this equipment. The DMX input circuit will be very simple and can be tested and traced without a schematic. The DMX input will go through an optocoupler into the processor. You will need to send data to the unit and put an oscilloscope on the Optocoupler output to verify operation of the interface, Beyond that the signal goes to the processor which is most likely working IF you can change the address.

    The only other thing I can think of is if you have certain type loads that interfere with the DMX data due to electrical noise. Chase is just an internal function so it would NOT be affected.

  • Fred Yearian Mar 19, 2011

    Also check wiring from the DMX inout connector to the circuit board OR if the connector attaches directly to the board, then check the soldering as it is a common place to have the solder break loose.

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