Doepfer

hmmm, i'm not 100% sure, but i would say that your
a141 is broken. anybody else having another idea?

best wishes

ingo



--- In Doepfer_a100@yahoogroups.com, erase <list@...> wrote:
>
> Hi, just got a used A141 and there is some trouble with it, just  
> wondering if there is a quick fix to this. Problem:
> 
> it seems to not shut the envelope voltage correctly, the led is 
there  
> although I have no gate input and when I drive it with my MCV24 it 
is  

> very hard to get it to shut, doing a fast noteon/noteoff simply  
> leaves it "open". not at all what my A140´s acts like. of course I  
> have nothing else plugged into it (except adsr out when testing)
> 
> thanks
> 
> d
> 
> 
> 
> 
> 
> 
> 
> 
> ***********************************
> 
> www.myspace.com/djerase
> 
> email: info@...
> msn: erasemusic@...
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> 
> 
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>

Hi, just got a used A141 and there is some trouble with it, just  
wondering if there is a quick fix to this. Problem:

it seems to not shut the envelope voltage correctly, the led is there  
although I have no gate input and when I drive it with my MCV24 it is  
very hard to get it to shut, doing a fast noteon/noteoff simply  
leaves it "open". not at all what my A140´s acts like. of course I  
have nothing else plugged into it (except adsr out when testing)

thanks

d








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erase wrote:
> Hi, just got a used A141 and there is some trouble with it, just  
> wondering if there is a quick fix to this. Problem:
> 
> it seems to not shut the envelope voltage correctly, the led is there  
> although I have no gate input and when I drive it with my MCV24 it is  
> very hard to get it to shut, doing a fast noteon/noteoff simply  
> leaves it "open". not at all what my A140´s acts like. of course I  
> have nothing else plugged into it (except adsr out when testing)


Do the following:
switch off the A-100.
Remove all conections. Definitely remove the MCV24.
Turn all pots of the A-141 to zero (7 o'clock position)
Switch on the A-100
-> Does the LED of the A-141 glow?
    If no: The A-141 itself works fine. Continue below at XXX
    If yes: plugin a cable into the Gate socket (other end
            hanging loose)
            -> Does the LED still glow?
               If yes: A-141 is broken
               If no: the A-141 receives some gatesignale via the
                      bus check out where it is coming from.
                      Connect the cable to rectangle out of an LFO. The
                      LED should blink short in the tempo of the LFO.
    XXX: If LED doe not glow at first check:
    turn Sustain-Pot (NOT the CV-Sustain!) fully clockwise.
    -> Does the LED glow now?
       If no: A-141 is good, but you had some troubles in gate wiring
              with your MCV24.
       If yes: plugin a cable into the Gate socket (other end
               hanging loose)
            -> Does the LED still glow?
               If yes: A-141 is broken
               If no: the A-141 receives some gatesignale via the
                      bus check out where it is coming from.
                      Connect the cable to rectangle out of an LFO. The
                      LED should blink short in the tempo of the LFO.

  Florian

Are you able to measure the output voltage of the A-141? There are some
tolerances in the OTA circuit used in the A-141 that may cause some +/-10 mV
offset offset voltage. If it is much more (e.g. 0.5 V or more) the module is
probably defective. If there is a small offset voltage only and you are
familiar with electronics there is a patch to remove the offset: inserting a
Schottky diode (e.g. BAT42) into the output.

Best wishes
Dieter Doepfer

> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von erase
> Gesendet: Freitag, 6. Oktober 2006 10:50
> An: Doepfer_a100@yahoogroups.com
> Betreff: [Doepfer_a100] A141 trouble
>
>
> Hi, just got a used A141 and there is some trouble with it, just
> wondering if there is a quick fix to this. Problem:
>
> it seems to not shut the envelope voltage correctly, the led is there
> although I have no gate input and when I drive it with my MCV24 it is
> very hard to get it to shut, doing a fast noteon/noteoff simply
> leaves it "open". not at all what my A140´s acts like. of course I
> have nothing else plugged into it (except adsr out when testing)
>
> thanks
>
> d
>
>
>
>
>
>
>
>
> ***********************************
>
> www.myspace.com/djerase
>
> email: info@erasemusic.com
> msn: erasemusic@msn.com
> aim: erasemusic@mac.com
> icq: 344917989
> yahoo: erasemusic@yahoo.com
> skype: erasemusic
> phone: +46(0)31-3608043
> mobile: +46(0)709-707781
>
>
> ***********************************
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
>

--- In Doepfer_a100@yahoogroups.com, erase <list@...> wrote:
>
> Hi, just got a used A141 and there is some trouble with it, just  
> wondering if there is a quick fix to this. Problem:
> 
> it seems to not shut the envelope voltage correctly, the led is 
there  
> although I have no gate input and when I drive it with my MCV24 it 
is  
> very hard to get it to shut, doing a fast noteon/noteoff simply  
> leaves it "open". not at all what my A140´s acts like. of course I  
> have nothing else plugged into it (except adsr out when testing)

If you have nothing in the 'gate' socket and the LED is still on with 
the 'R' pot set at 0, then there is a problem with the module, as 
(unless there is a newer version than mine, marked 'version 1 1996') 
there is no internal connection possible of the gate to the bus 
(unlike the A-140), so (on a working module) with no gate signal and 
a fast release the envelope should quickly go to zero and the LED 
should go out.

If the ICs are socketted (they are on mine), check that they are all 
seated properly by giving them a firm push. Also, are there any signs 
of obvious modification by the previous owner? - there should be 6 
wires between the 2 boards: 5 are bare wire; the sixth is longer and 
insulated, marked 'gate' at both ends.

Tim

haha, you work with support ? great anyway, problem still there though,

thanks

d


On 6 okt 2006, at 12.19, Florian Anwander wrote:

> erase wrote:
>> Hi, just got a used A141 and there is some trouble with it, just
>> wondering if there is a quick fix to this. Problem:
>>
>> it seems to not shut the envelope voltage correctly, the led is there
>> although I have no gate input and when I drive it with my MCV24 it is
>> very hard to get it to shut, doing a fast noteon/noteoff simply
>> leaves it "open". not at all what my A140´s acts like. of course I
>> have nothing else plugged into it (except adsr out when testing)
>
>
> Do the following:
> switch off the A-100.
> Remove all conections. Definitely remove the MCV24.
> Turn all pots of the A-141 to zero (7 o'clock position)
> Switch on the A-100
> -> Does the LED of the A-141 glow?
>     If no: The A-141 itself works fine. Continue below at XXX
>     If yes: plugin a cable into the Gate socket (other end
>             hanging loose)
>             -> Does the LED still glow?
>                If yes: A-141 is broken
>                If no: the A-141 receives some gatesignale via the
>                       bus check out where it is coming from.
>                       Connect the cable to rectangle out of an LFO.  
> The
>                       LED should blink short in the tempo of the LFO.
>     XXX: If LED doe not glow at first check:
>     turn Sustain-Pot (NOT the CV-Sustain!) fully clockwise.
>     -> Does the LED glow now?
>        If no: A-141 is good, but you had some troubles in gate wiring
>               with your MCV24.
>        If yes: plugin a cable into the Gate socket (other end
>                hanging loose)
>             -> Does the LED still glow?
>                If yes: A-141 is broken
>                If no: the A-141 receives some gatesignale via the
>                       bus check out where it is coming from.
>                       Connect the cable to rectangle out of an LFO.  
> The
>                       LED should blink short in the tempo of the LFO.
>
>   Florian
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
>
>
>








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