[sdiy] TB303 CPU update, still not working

[Anthony Bisset]

i had a similar problem (step 1 lit but no play) when i was working on my
606.  it occurred right after i removed all i/o jacks.  it turns out the
run/stop footswitch input on the back was a closed jack.  when i removed
this jack, the clock was no longer going to the cpu.  i would have saved
some time if i'd known the type of input jack before i disconnected it.

having messed about a fair amount with the 606/303 clock signal i'd say
you don't have clock at the moment.  the stop/start line is being held
high (+5) if you're getting a lit first step.  for the sequencer to run it
requires stop/start stay high + a clock signal.  try the dinsync at back
to see if an external xox box can run it.

-a


On Thu, 24 Nov 2005, Fiercefish wrote:

> I got a CPU for my 303 (NOS part) that was missing it, I have installed it and the 303 is still not working, it is missing some pots and the mix in jack, would this prevent it from working? (I have these part on the way) When I press start the LED lights up but nothing else, any ideas?
>
> FF