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CBT16PC Gen2 - Signal to one channel lights 2 channels


Darrell

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I have a Gen 2 controller that seems to be dupping a channel signal.  Using the Hardware Utility, if I turn on channel 8, both 8 and 11 turn on.  Same if I try to only turn on channel 11.  Both 8 and 11 always turn on.  I have reset the power to this controller but the fault remains.  Any other tests or fixes I can try?  I originally thought I had a channel config issue in the sequences but finally diagnosed it down to the hardware.

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Start by very carefully visually inspecting the board for anything like corrosion, loose wires, obvious burn marks.  In other words, anything that does not look right.

 

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In addition to what Jim said.

Is this a factory board (vs kit), in a factory case? (loose boards are easier to smear solder/traces)

The odd thing, is 2 banks are involved.  and the Binary Data is not even adjacent bits (1000 vs 1011)

But decoded traces could run next to each other, so use a brite light and magnifier  to look for corrosion.

An old toothbrush is great for cleaning lite debris away.

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This was a factory board but with a kit.  I did the mounting into the cases and attached the pigtails but the board itself was factory done.  I'm tearing down everything today so once I have the controller free I will take a close look for corrosion.

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52 minutes ago, Darrell said:

This was a factory board but with a kit.  I did the mounting into the cases and attached the pigtails but the board itself was factory done.  I'm tearing down everything today so once I have the controller free I will take a close look for corrosion.

Good news. That eliminates soldering issues (wrong type or cold joints). BTW I have 2 @ GEN3 that I bought that way. Saved a few $ plus I added a set of LOR network dongles before mounting the assembly

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Following up - Don't know what caused the initial problem but it has seems to have fixed itself.  This was a 12 year old Gen 2 controller and I ran the tests 3 times and still got the same fault.  The only thing I failed to do while it was still hooked up in the display was to physically disconnect the power inputs.  Once the display was down and I re-tested this controller inside, I could not get the problem to repeat.  So bottom line - just like "hard rebooting a PC" to diagnose an issue, checking an AC controller needs to include a complete power disconnect and restart with enough time for all power to dissipate.

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