Try to check 4xxx circuits on effects board... also very popular
problem in korgs is that lm13600 got broken often. ne5517n is cheap
and good replacement for those! :)
--- In PolySix@yahoogroups.com, "Dr Funk" <frank@...> wrote:
>
> Hi Andy
>
>
> > No problem, we are always here to help, if we can!
>
>
> Much appreciated!
>
>
> Actually, I do
> > mean what I say. Look at the circuit diagram and carefully study IC29
> > and IC34. You will see that pin 5 is connected to the ports on the
> > CPU. It doesn't look like it on initial inspection, but it is true.
> > Without these present no data for the effects panel will be clocked
> > through.
>
>
> These both appear to be fine.
>
>
> >
> > What I would suggest is that you print out the KLM-367 circuit
> > diagram, take out a coloured marker and check the continuity around
> > both these ICs. As you do mark the line as checked in hideous yellow
> > ink. Apologies if this is 'grandmother' and 'eggs'!
>
>
> No problem! I am an 'enthusiastic amateur' when it comes to
> electronics, but I've learned a lot in the past few months! It's very
> satisfying to begin to understand how my synths work. Anyway, I've
> checked continuity as much as I can, and everything seems to check
> out. I've checked IC29 and IC34 to the CPU and external connectors,
> and it all seems to be ok.
>
>
> >
> > You can check the logic levels with the oscilloscpe. Sorry I didn't
> > realize you had one! You could use the DVM to do this but you
> > wouldn't be able to see a pulse train (rapid changing levels) using
> > one.
>
>
> Sounds good, but I'm not sure where to probe! IC29 and IC34?
>
>
> >
> > Also you might want to fully test the continutiy of tracks D02 and
> > P11, P12, P13. These actually leave the 367 and are wired to the
> > switch via diodes.
>
>
> These seem to be ok too.
>
>
> Sorry, it is labourious work, but one you spot the
> > fault it is a joy to behold!
>
>
> I can't wait! :-)
>
>
> >
> > Question? Does the EG Mode and Sub Osc switch do anything?
>
>
> Yes, both seem to be working properly. Also, if effect intensity is
> turned up full, when chorus is selected the filter seems to open up
> slightly, and if phaser is selected there's a low level repeating
> pulse sound audible.
>
> Cheers
> Frank
>