> To: doepfer_a100@yahoogroups.com
> From: tapirkillen@...
> Date: Fri, 24 Aug 2012 15:19:19 +0200
> Subject: RE: 1 Re: Troubleshooting A-155
>
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> I have tried with external signal in for the offending pot, but to no avail. Still nothing happens. Its value is still zero, no matter what I send as external signal.
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> As far as I remember I tried tracing all connections with the multimeter, comparing to the working row of pots, but could not find any difference. But I will check once more and see what might turn up.
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> /Janne
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> To: Doepfer_a100@yahoogroups.com
> From: richyho@...
> Date: Fri, 24 Aug 2012 14:11:22 +0100
> Subject: 1 Re: Troubleshooting A-155
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> Hi
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> It could be a problem with the jack socket below the pot instead of the pot
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> itself. I believe that when a lead is plugged into this the knob becomes an
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> attenuator of this signal. If the socket 'thinks' a cable is plugged in
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> then that knob may be attenuating zero volts so not doing anything. This
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> can happen when the metal contacts in the socket become damaged and touch
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> even when nothing is plugged in. You need to check continuity with a
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> multimeter, comparing the results with another working socket. Quite a
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> simple fix with a small screwdriver if this is the case.
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> Rich
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> Hi everyone!
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> I have got an A-155 sequencer where one of the pots on the bottom row does
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> not work. At all.
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> In order to try to pin down the error I have swapped the ICs from the top
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> row to the bottom row (http://www.doepfer.de/A100_pictures/doepfer_a155.jpg,
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> the two PCBs with the knobs), but the problem was still there. Is there
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> anything else I can do I have also tried to measure resistance what is
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> happening when turning the pot, but I did not see anything that made the
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> offending pot differ from working pots.
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> Is the pot itself broken, or is there anything else I should try to pin
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> down the problem
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> Modular regards,
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> Janne
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