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Permalink Reply by 3D Robotics Tech Support on November 1, 2011 at 9:54am

Hi Jonathan,

The part number for the MUX is 74ACT157SC, and you can replace it directly. The chip does not need to be programmed.

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Permalink Reply by Jonathan Diaz on November 3, 2011 at 3:38pm

Ok thanks! can't find a chip here though, all 74act157 or 74ls157 are in DIP. So far no luck in finding SOIC. I guess I have to ship it from somewhere haha. Thanks for the heads up though.

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Permalink Reply by Aqntbghd on November 2, 2011 at 8:43am

Little update on my case : I've reflashed the 328P with an AVRDragon programmer, went fine. I've reset the EEPROM of the ardupilot, and after many tests, here is the status : 

• All radio input channels are to zero exempt channel 1 which works fine and channel  7 and 8 which is blocked to 497.
• My radio is working fine (tested with a servo)
• The Mux and Power led are Full-on, the PPM led blinks quickly (seems normal isn't it?)

 

I think i will have to declare my APM red card dead at some point... :/ any new ideas ?

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Permalink Reply by Andrew Radford on April 23, 2012 at 5:18am

I have also had a dead mux chip - can't remember if the symptoms were the same as yours though.

The chip can be replaced, it can be done with a soldering iron, it is easier if you use some flux though.

Alternatively, I 'fixed' mine by lifting the enable pin on the mux, that permanantly means that I cannot do rx passthrought, but I only fly a copter so it does not matter to me. Advantage is I don't have to replace the mux chip.

I discovered this only after replacing the 328 (for no reason in the end).

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Permalink Reply by Ajienux on April 23, 2012 at 5:28am

where you buy that chip ? 

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Permalink Reply by Ajienux on April 23, 2012 at 3:55am

where i can buy this chip(74ACT157D) , i can't found in local store :(
need sugestion
thanks :) 

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