Doepfer

Hi all, I'm Max from France and this is my first message to the
Doepfer group.
I got my A100 today and it is even more interesting than i expected,
i'm really happy.

However, i have problems with the A-188-1 module that looks strange to
me for two reasons :

The first thing wrong is that the number of stages of the module is
not mentionned on the rear pannel. One of the circles that indicate
this value should be colored black, but none is, they're all empty. I
took it off the case to see the electronic board and read "A188-1
version 2" so i guess it is A-188-1B (1024 stages), the one i ordered.

The second problem (the real one) is that there's no audio from BBD
out... Neither is there from mix out when the potentiometer is turned
to 100% wet (BBD)but the dry output signal (original) is normal.
I tried many things and settings ( input lvl 10; CV input switchs to
0; with/without feedback, BBD polarity + - 0 ...) I also tried to take
the module off the case to see if it was a problem with the PSU, but
ain't got no signal from BBD out. The connection with the bus board is
ok (set once, by myself and correctly). 
When feedback is set to 10 it slightly self-oscillate and i can
'sweep' the self oscilation freq with the delay clock potentiometer,
however, the level of the self oscillation is nearly inaudible and i
had to amplify it a lot to ear it.


Is there anything i can do to make it work or to make sure it has a
problem and has to be shipped back ?
Please help !

Sorry for bad english and thanks all for building such an interesting
and active message board.
Max.

Max,

you find my comments written inline.

Best wishes
Dieter Doepfer

> Hi all, I'm Max from France and this is my first message to the Doepfer
group.
> I got my A100 today and it is even more interesting than i expected, i'm
really happy.
>
> However, i have problems with the A-188-1 module that looks strange to
> me for two reasons :
>
> The first thing wrong is that the number of stages of the module is
> not mentionned on the rear pannel. One of the circles that indicate
> this value should be colored black, but none is, they're all empty.

That's strange. From the factory only A-188-1 modules without BBD circuits
are delivered without filled circles at the front panel. Where did you
purchase the module ?

> I took it off the case to see the electronic board and read "A188-1
> version 2" so i guess it is A-188-1B (1024 stages), the one i ordered.

The label "A-188-1 Version 2" on the pc board does not say anything about
the number of stages. These are determined by the BBD circuit that is used
in the module. For details please refer to this document:

www.doepfer.com > PRODUCTS > A-100 MODULES OVERVIEW > A-188-1 >
A1881_adjustment.pdf

I assume that there is no BBD circuit on the pc board and received a module
without BBD by mistake.

> The second problem (the real one) is that there's no audio from BBD
> out... Neither is there from mix out when the potentiometer is turned
> to 100% wet (BBD)but the dry output signal (original) is normal.

This affirms my assumption that you got an A-188-1 without BBD circuit.

> I tried many things and settings ( input lvl 10; CV input switchs to
> 0; with/without feedback, BBD polarity + - 0 ...) I also tried to take
> the module off the case to see if it was a problem with the PSU, but
> ain't got no signal from BBD out. The connection with the bus board is
> ok (set once, by myself and correctly).
> When feedback is set to 10 it slightly self-oscillate and i can
> 'sweep' the self oscilation freq with the delay clock potentiometer,
> however, the level of the self oscillation is nearly inaudible and i
> had to amplify it a lot to ear it.
>
> Is there anything i can do to make it work or to make sure it has a
> problem and has to be shipped back ?

Please contact the dealer where you purchased the module to clarify the
affair. Maybe they have sent you the wrong module.

> Please help !
>
> Sorry for bad english and thanks all for building such an interesting
> and active message board.
> Max.

Just... Max I have no idea about yr A1888-1... but just coming to say "bonjour"... I dont 
know if there are many french on this list... but at least now I'm sure I'm not alone 
anymore....



Best,

Alexandre



--- In Doepfer_a100@yahoogroups.com, <hardware@...> wrote:

>
> Max,
> 
> you find my comments written inline.
> 
> Best wishes
> Dieter Doepfer
> 
> > Hi all, I'm Max from France and this is my first message to the Doepfer
> group.
> > I got my A100 today and it is even more interesting than i expected, i'm
> really happy.
> >
> > However, i have problems with the A-188-1 module that looks strange to
> > me for two reasons :
> >
> > The first thing wrong is that the number of stages of the module is
> > not mentionned on the rear pannel. One of the circles that indicate
> > this value should be colored black, but none is, they're all empty.
> 
> That's strange. From the factory only A-188-1 modules without BBD circuits
> are delivered without filled circles at the front panel. Where did you
> purchase the module ?
> 
> > I took it off the case to see the electronic board and read "A188-1
> > version 2" so i guess it is A-188-1B (1024 stages), the one i ordered.
> 
> The label "A-188-1 Version 2" on the pc board does not say anything about
> the number of stages. These are determined by the BBD circuit that is used
> in the module. For details please refer to this document:
> 
> www.doepfer.com > PRODUCTS > A-100 MODULES OVERVIEW > A-188-1 >
> A1881_adjustment.pdf
> 
> I assume that there is no BBD circuit on the pc board and received a module
> without BBD by mistake.
> 
> > The second problem (the real one) is that there's no audio from BBD
> > out... Neither is there from mix out when the potentiometer is turned
> > to 100% wet (BBD)but the dry output signal (original) is normal.
> 
> This affirms my assumption that you got an A-188-1 without BBD circuit.
> 
> > I tried many things and settings ( input lvl 10; CV input switchs to
> > 0; with/without feedback, BBD polarity + - 0 ...) I also tried to take
> > the module off the case to see if it was a problem with the PSU, but
> > ain't got no signal from BBD out. The connection with the bus board is
> > ok (set once, by myself and correctly).
> > When feedback is set to 10 it slightly self-oscillate and i can
> > 'sweep' the self oscilation freq with the delay clock potentiometer,
> > however, the level of the self oscillation is nearly inaudible and i
> > had to amplify it a lot to ear it.
> >
> > Is there anything i can do to make it work or to make sure it has a
> > problem and has to be shipped back ?
> 
> Please contact the dealer where you purchased the module to clarify the
> affair. Maybe they have sent you the wrong module.
> 
> > Please help !
> >
> > Sorry for bad english and thanks all for building such an interesting
> > and active message board.
> > Max.
>

--- In Doepfer_a100@yahoogroups.com, <hardware@...> wrote:
>
> Max,
> 
> you find my comments written inline.
> 
> Best wishes
> Dieter Doepfer


> That's strange. From the factory only A-188-1 modules without BBD
circuits
> are delivered without filled circles at the front panel. Where did you
> purchase the module ?


That's right, the BBD circuit is missing, i purchased the whole system
at M.E.S.I. (France). Had them on the phone today, they'll give me
another BBD module with the BBD. =)
Txs for helping me find the bug !
Max.