Doepfer

> Not all of the modules that failed have been in the same case. With the
> sequencer, I removed all of the other modules from the case, and the bottom
> row knobs were still malfunctioning. I suppose that this doesn¹t rule out a
> problem with the power supply. I don¹t currently have a means of verifying the
> voltage... 
>  
>  
> 
> ³Hi Gene,
>  
> My initial thought is for you to check your PSU is not overworked or failing
> in some way.
>  
> Ideally check the voltages with everything plugged in and if your running
> below +/- 12V then that could be the problem. Some modules are a bit more
> sensitive to voltage drop than others.
>  
> Rgds
>  
> David
>  
> David Salter
> Senior Consultant
> PSG 
> 
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> ________________________________
> 
> From: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100%40yahoogroups.com>
> [mailto:Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100%40yahoogroups.com> ]
> On Behalf Of Gene Schwartz
> Sent: 19 May 2007 03:24
> To: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100%40yahoogroups.com>
> Subject: [Doepfer_a100] Been having trouble with Doepfer modules
> 
> I¹m not even sure what the question is exactly...I don¹t know much about the
> electronics end of things, and perhaps someone might look at what¹s happened
> and have some ideas about what¹s going on. Or perhaps it¹s just bad luck?
> 
> In the past few months I¹ve had 3 modules fail. A wasp filter stopped
> filtering (but would send the signal through), a logic module stopped
> working, and now, most disconcertingly, my a-154 isn¹t working properly.
> The top row of knobs and the various functions of the sequencer and the
> a-155 work ok, but knobs 2-4 on the bottom aren¹t working properly. The
> third knob has a limited warbly range, and the other 2 don¹t work at all.
> The module used to work fine.
> 
> I also find that when I plug more than 1 or 2 outputs from a multiple, the
> signal degrades ­ the voltage range that comes out from it is decreased
> (probably could be said a lot better. I hope that I¹m making some sense).
> 
> Does the combination of these things point to some kind of underlying cause?
> Is this expected behavior from a multiple (I hope not)?
> 
> Do I simply have no idea what I¹m talking about (kind of hope so).
> 
> Discouraged right now. I really need the a-154.
> 
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