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2 channels have problems turning off


Kim
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Hi All,

After running fine for 3 days, channel 9 and 10 seems to have problems turning off. most of the time during a show. They will stay lit. However, they will turn off every 10'th time or so. I tried to measure the voltage on R20 and R21 but as soon as i touch a resistor (Opto side) with the testpin, the channel turns off!. Im running with 230 volts and the opto to triac resistors is 330 ohm.¨

I have tried to reset the controller.

The load is 200 LED's on every channel. Channel 3 to 8 has the same load and works fine. The LED strings is a type with transformer.

Any ideas?

/Kim (Denmark)

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Was this a board that you assembled? If so, then possibly a poor solder joint in the circuit for those channels.

The other thing to try is a rest of the board.

Chuck

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It's the Blue board.

Problem solved. For some reason i needed to put a little more load on the two channels.

With a extra string of 100 LED's on each channel, the channels work fine again!

Regards
/Kim

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