Doepfer

Hello Dieter,

I double checked the jumpers and though I didn't measure I felt the piggybag heater was warm. 

I contacted my supplier in Holland and he suggested to send it in. 
Honestly....thank you very much for your reply but I don't want to "experiment" with a brand new module by touching the offsets and messing things up. 

Because I am a bit unpatient I ordered a new one from Thomann. 
Should be there tomorrow. 

Hopefully it will work just as fine as the others. :-)

Thank you again

Best regards 

Jacco Ville
The Netherlands


Verstuurd vanaf mijn iPhone SE Lunatik 

> Op 27 jul. 2016 om 09:50 heeft yahoo@doepfer.de [Doepfer_a100] <Doepfer_a100@yahoogroups.com> het volgende geschreven:
> 
> Hello Jacco,
> 
> all A-143-4 should have a similar frequency range. Maybe the frequency
> offsets were not adjusted as prescribed. There are four trimming
> potentiometers on the A-143-4 pc board which are labelled "OFFSET 1" ...
> "OFFSET 4". These are used to define the frequency offsets. You may try to
> adjust the trimming potentiometers of the second module so that they match
> to the other module.
> 
> Another reason could be a faulty heater. One of the integrated circuits is
> equipped with a piggyback heater which warms up the circuit at about 40
> degrees Celsius. If the heater is defective this may also cause a different
> frequency range (and even the scale is probably off). Simply compare the
> temperature of the heaters of the two modules about 10 minutes after power
> on by means of touching them with the finger.
> 
> Pay also attention that the jumpers for the bus CV are the same for both
> modules. Otherwise one of the modules may pick up a CV from the bus which
> may cause different frequencies.
> 
> Hope this helps
> Dieter Doepfer
> 
> 
> 
>> -----Ursprüngliche Nachricht-----
>> Von: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com]
>> Gesendet: Dienstag, 26. Juli 2016 23:11
>> An: Doepfer_a100@yahoogroups.com
>> Betreff: [Doepfer_a100] Faulty A143-4 vclfo/vco?
>> 
>> 
>> Hello Dieter,
>> 
>> While building my new drone station I discovered something odd.
>> With all new bought modules there is one which doesn't work
>> properly, an A143-4.
>> Now I already own two of them so I compared them with the same
>> (factory) settings, al jumpers in place except for the busCV
>> jumper which I took out.
>> With all pots ccw and in LFO mode I slowly turn up the frequency
>> on channel 1.
>> There is a big difference between the two modules, one will fully
>> CW in a rather high speed, the other (faulty?) is probably only
>> half that speed.
>> In VCO modus this is about the same, the good module goes really
>> high (as it should) the other one stays at medium frequency.
>> The only way to get a really high frequency is by putting the
>> common pot cw.
>> I tried al channels and checked all jumpers but I don't know what
>> this problem is.
>> Please help.
>> 
>> Best regards
>> 
>> Jacco Ville
>> The Netherlands
>> 
>> ------------------------------------
>> Posted by: jaccoville@yahoo.com
>> ------------------------------------
>> 
>> 
>> ------------------------------------
>> 
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