Doepfer

Hello Karl,

before you replace the BBD chip I'd recommend to measure the clock output (center top socket). It should output a rectangle in the frequency range about 10 kHz ... 200 kHz when the delay clock control is operated from 0 to 10. It could be also another range (e.g. about 15 kHz to 300 kHz) but about 1:20 frequency relation. If that's not the case probably the high speed VCO is defective (built around CA3096/LM13700). In this case I'd recommend to replace the CA3096 and LM1700. If the clock output is OK probably the BBD chip has to be replaced.

Best wishes
Dieter Doepfer


> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com]
> Gesendet: Donnerstag, 11. Juli 2019 22:03
> An: Doepfer_a100@yahoogroups.com
> Betreff: [Doepfer_a100] Re: A-188-1 (1024) problem
> 
> Thank you Dieter!
> I replaced the LM324 and the CV input works!
> the delay is still very slight. its a 1024, yet the delay sounds tiny.
> Q: if the delay chip is fried, can I replace it?
> THANK YOU AGAIN!
> KARL.