[sdiy] Help wanted with PPG 2.2 problem

[Paul Maddox]

Bert,

> I have a problem with midi of a PPG2.2

kewl, my favourite synth....

> the problem is playing the PPG2.2. thru midi it doesn't work well. There
are
> notes missing or the wrong note is played.
>
> In this PPG there is a "tower" board placed at the last board. This board
is
> connected to the mainboard thru the IC socket and two wires.

yep, midi daughter board, midi wasn't inveted at the time of the PPGs
release,
Wolfgang Palm (creator of PPG) added it later...

>
> I've noticed two things and mayby somebody can help me about this.
>
> Pin 15 of the IC socket is missing, so there is no connection from pin 15
of
> this towerboard to the mainboard . Is this as it should be or should there
a
> connection?

Is it?
Which IC socket?
Do you mean the pin that goes FROM the daughter board into the socket on the
main CPU (or IO) board?

> One of the two wires is loose (this is the wire which came from the 6522).
> Where must this wire connected at the "tower" board?

Ok, this sounds like the reason your PPG isnt behaving correctly..
Can you let me know EXACTLY which wire has come adrift, and where the
missing pin is?

It sounds like your PPG was transported badly and bits came loose at some
point, someone couldn't
be bothered to repair it properly so they just put it back in its socket and
hoped..

I run a webpage for PPG synthesisers (link below)
I also have the service guide and many other usefull things.. (I also own a
2.2)
I have also fixed several of them and have helped others fix their own PPG
gear.

Let me know the details of the wires and if possible take some pictures with
a digital camera and email them to me.
And I should be able to help you.

Paul Maddox
_______________________________________
Wavesynth home page;-
    Http://www.wavesynth.com
Modulus synthesizers home page;-
    Http://www.wavesynth.com/modulus