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Rack 6 channel flickering

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I have a strange thing on one dimmer rack 6. Channel 3 only flick at full power, but if another channel is also on, it stay stable. From 0 to 80/90% is seems working fine.

All solder look fine on the bottom. I'm not sure replacing the traic and the 12V zener diode was enought to cure the problem.


Connected on 3 phases main power suplly, for the test with 75 W lamp on each channel.


Does anyone have an idea ?



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