SLX4L TTL Logic Pin 1 Status Modification

FAQ #3461 Updated February 16, 2018

Question:

I have an SLX4L. I need to make the Logic status of Logic Pin 1 High (+5V) when the mic is active, and Low (0V) when the mic is muted. This would be the reverse of how it is shipped. Is this possible?

Answer:

Yes. This is possible, but only through a modification made to a PC board inside the SLX4L receiver. Normally a transmitter that is on will result in a 0V status on pin 1 of the logic output.

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Here are instructions to reverse the pin 1 status:

Step 1: Remove the chassis case from the SLX4L. Remove the 4 screws from the sides of the SLX4L as shown.

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Step 2: Push down on the front edge of the receiver case and slide the case shell backward to reveal the PC boards inside.

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Step 3: Locate the PC daughterboard inside. It is the smaller of the two.

Step 4: With a soldering iron, remove resistor R8 from its position.

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Step 5: With a soldering iron, place same resistor to position R9.
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Step 6: Reassemble the SLX4L.

A transmitter that is on should now result in a +5V logic signal at pin 1 of the logic output.

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