> > Does the LED of the internal clock oscillator of the A-154
> display a clock
> > signal. Try this settings: clock ~ 7, PW ~ 5, with first stop
> control = 0,
> > last step control = 10, mode = 0 (forward). And pay attention
> to the correct
> > position of the master switch (right position).
>
> Yes, the clock LED is blinking. I've already tried the above settings
> combination and it did not work.
>
> > And if you give back the control to the A-155 (master switch = left
> > position): does the A-155 work like before
>
> Yes.

The only idea I still have is a poor or broken contact of the clock input
socket. Otherwise you have to send back the module for repair. And be sure
(though I already mentioned that) that the module is not in the CV
controlled mode. In this case the step position is controlled by the CV of
the first step control+CV and the clock input does not work in the usual
way, i.e. not clock triggered step advance.

Best wishes
Dieter Doepfer