The internal oscillator is fed via the switching contact of the Ext.CLK
socket. If the switching contact of this socket is worn out is does no
longer make contact. Maybe this is the reason. Try an external oscillator
connected to the Ext.CLK socket to find this out.

Best wishes
Dieter Doepfer

> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto: Doepfer_a100@yahoogroups.com ]Im Auftrag von Tommy DOG
> Gesendet: Sonntag, 8. März 2009 13:34
> An: Doepfer_a100@yahoogroups.com
> Betreff: 1 Doepfer A-117 trouble
>
>
> Symptoms: DNG RND CLC outputs a thin oscillator sound without the
> digital noise present. other outputs are fine.
>
> It sounds to me as if there is an oscillator that drives the
> digital sound source and only the driver is functioning.
>
> In this picture:
> http://3.bp.blogspot.com/_d9uh_FFQZoQ/SW_321zu3zI/AAAAAAAAAFM/vAu-
> C9ki aw4/s1600-h/a117m.jpg
>
> If I make this simple connection the unit sounds good when
> something is patched into the ext. Clk input AND can be tuned.
>
> I spotted following chips:
> cd40106b
> cd4006
> cd4070
>
> Please let me know what the others 2 are and if these are correct.
>
>
> Thank you.
>
> +++++++++++++++++++++++++
>
> I thought I posted this yesterday but it didn't appear in the
> archive. My apologizes if anyone receives this twice.
>
>
>
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