Doepfer

hello again,
if i remember right:
out of the 8 a111's i have,
one of my a111's had the exact same problem with the
PWM input and it turned out that its CEM3340 needed a
replacement(wich doepfer replaced and the module
worked fine afterwards).
then, after some months, two of my other a111's had
the exact same PWM problem and, by just plugging a
cable into the hard sync input and then adjusting the
metal plates of the hardsync input socket, fixed the
problem entirely!
so, it seeems that this PWM symptom has two different
causes...
at least that is my experience so far.
best regards,    :-)
Bakis.


--- Tim Stinchcombe
<timothy@tstinchcombe.freeserve.co.uk> wrote:

> Hi Markus,
> 
> > I didn't find any hint at the Doepfer page. Any
> other idea?
> 
> After checking some of the history on this problem,
> I realised I too 
> had this problem when I first got my A-111 (over 4
> years ago), and 
> the solution then, by EMIS the UK distributor, was
> to replace the 
> CEM3340 chip. In an old email I had written to
> Dieter at the time, I 
> mentioned that specifically grounding the hard sync
> input did *not* 
> cure the problem!
> 
> However, checking past messages, the last time this
> appeared seems to 
> have been post #9193, about a year ago: one of the
> follow-up posts, 
> #9203, contained the suggestion from Dieter about
> grounding the hard-
> sync input, but checking my module against what he
> says doesn't make 
> sense, as the switched contact on mine is *not*
> grounded (but I'm 
> guessing on new modules they solder across the gap).
> Hence I suggest 
> the following:
> 
> Insert a patch lead into the hard sync socket, and
> *deliberately 
> ground the tip at the other end*.
> 
> If this cures it, have a look at the switched
> contacts on the hard 
> sync socket - these are the two on the very end of
> the board. I 
> suspect that they are bridged with solder: if they
> are, then probably 
> a new socket is needed; if they are not, then
> bridging them with 
> solder will have the effect of always grounding the
> hard sync line 
> when no plug is inserted, which hopefully should
> then give a 
> permanent solution.
> 
> If inserting and grounding the lead doesn't totally
> remove the 
> problem, then I suspect you'll need a new chip as I
> did!
> 
> Tim
> 
> 
> 
> 
> 
> 


Bakis Sirros - Parallel Worlds
[Doepfer_a100] group owner
http://www.parallel-worlds-music.com
http://www.myspace.com/parallelworldsmusic
http://www.shimarecords.co.uk
http://www.rubber.gr
Athens-Greece

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