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6MIX dead after resistor change?

Posted: Fri Aug 10, 2018 1:46 am
by autodafe
I have built a 6MIX
it was working, I only had something strange in the LEFT button which was always lit and didn't mute anything
I had places some "bigger" 470 Ohm resistors and I was supecting they were the issue (I had soldered them badly just to make contacts with the pads)
I had some 470 Ohm ferrites with the correct size and decided to replace the left resistor with one of these

As soon as I powered the module, no light from the buttons and from the LEDs...it seems dead

is it possible that the ferrites caused the burn? or maybe I shirted something?
what should I try to replace now?

Posted: Fri Aug 10, 2018 2:26 am
by flts
As mentioned in viewtopic.php?p=2885508, the 470 ohms in case of a ferrite bead is not DC resistance like with a resistor, but a high frequency resistive impedance value.

So basically that change is almost the equivalent of shorting the 470 ohm resistor, which means it's highly possible there is some damage done.

Posted: Fri Aug 10, 2018 3:32 am
by autodafe
ok thanks.
what might I have damaged now? I don't think there are schematics for the mixer....

Posted: Fri Aug 10, 2018 9:41 pm
by synthetek
The 2 470R look like they are current limiting resistors for the LED in the switches so It could have blown those LEDs, but if nothing is working I would check the diodes by the power connector first. Also check the R3 and R4 the 10R resistors by the power connector.

http://antumbra.eu/content/bom/6mix/v1- ... matics.pdf