> Hi!
>
> I have a A-156 dual quantizer where the top quantizer stops working after being switched on for a few hours when it is in
> the case (P6, not the best ventilation in there). The output is either 0V or +5V. Removing the module from the case,
> cooling it by blowing on it, it starts working almost immediately. Put it back in the case and it soon stops working.
>
> I have tried to identify any parts that gets hot, but none of them sticks out as warmer than the rest, even the regulator
> is not that warm.
>
> Any ideas on this
>
> Best regards,
>
> Janne

That's really strange and I have never heard from such a behaviour of the module. It could be the processor or the XTAL or the DACs
or ...
To make sure that it's not the switching contact of the trigger signal please check if the module does work with an external trigger
signal when the fault occurs. Elsewise one has to replace one part after the other to find out which of the parts causes the
problem.

Best wishes
Dieter Doepfer