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AW: [vintagesynthrepair] New Arp 2600 questions

2002-05-24 by Ullrich Peter

>This picture:  <http://68.55.220.59/104.jpg> shows the 4 blue 
>components which are bridging gaps cut into the track work.  Neither 
>these components nor the cuts in the trackwork are mentioned in the 
>service manual.  Can anybody tell me what these blue components are 
>and why there are cuts in the trackwork?  Each track corresponds to 4 
>of the 5 audio input sliders on the front.

This are electrolytic capatcitors! Maybe to remove hum on
power supply lines...

Ciao
Peter

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--oOOO--(_)--OOOo------------------------------------------------------
                   Ing. Peter Ullrich   mailto:peter.ullrich@...
                   Homepage: www.ullrich.at.tt , http://come.to/ullrich
   .oooO           Hardware & Software Developer /  Electronic Musician
   (   )   Oooo.   KAPSCH AG / TrafficCom              Vienna / Austria
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Re: New Arp 2600 questions

2002-05-24 by ethanzer0

> 
> This are electrolytic capatcitors! Maybe to remove hum on
> power supply lines...
> 
> Ciao
> Peter


Is it possible one or all of these caps is bad?
Do caps like these go bad easily?  How can I test?

Thanks again,

Ethan

Re: New Arp 2600 questions

2002-05-24 by ethanzer0

> 
> This are electrolytic capatcitors! Maybe to remove hum on
> power supply lines...
> 
> Ciao
> Peter


Is it possible one or all of these caps is bad?
Do caps like these go bad easily?  How can I test?

Thanks again,

Ethan

AW: [vintagesynthrepair] New Arp 2600 questions

2002-06-06 by Hintraeger Reinhard

Hello Ethan!

The blue components in your picture are electrolytic capacitors. As they are in audio input lines, I guess they were inserted for decoupling unwanted DC-signals from the AC audio signals. I' ve got no experience with the ARP 2600, but I can't imagine that this has any influence on your VCF-problems.

Anyway, it shouldn' t do any harm to your synth if you just close the gaps and so short the capacitor. So you will see if these capacitors have any influence on your VCF problems or not.

Hope you get along with your synth,

kind regards

Reinhard

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-----Ursprüngliche Nachricht-----
Von: ethanzer0 [mailto:ethanzer0@...]
Gesendet: Freitag, 24. Mai 2002 14:22
An: vintagesynthrepair@yahoogroups.com
Betreff: [vintagesynthrepair] New Arp 2600 questions

I have been having this VCF problem for a while now and I decided to
get the Arp 2600 service manual and fix it my self. I have a grey
face Tonus Arp 2600, however, it has a 4072 VCF. The first thing I
noticed are components which are not in the parts list or on the
schematics or board layout drawings in the service manual.

This picture: http://68.55.220.59/104.jpg shows the 4 blue
components which are bridging gaps cut into the track work. Neither
these components nor the cuts in the trackwork are mentioned in the
service manual. Can anybody tell me what these blue components are
and why there are cuts in the trackwork? Each track corresponds to 4
of the 5 audio input sliders on the front.

In the parts list of the service manual it lists C1, C2, and C3 as
all being 1uf CAP TANTALUM 35V 10%, however, from this photo This
picture: http://68.55.220.59/106.jpg, you can clearly see C3 is a
ceramic disc cap.

Has anybody worked on a 2600 that looked like this on the inside?
Can anybody shed some light on where to start looking for problems?
Should restore the components to the exact components in the parts
lists? should I remove those 4 blue components and restore the track
work?

The rest of the unit works fine.

Thanks in advance,

Ethan

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AW: [vintagesynthrepair] New Arp 2600 questions

AW: [vintagesynthrepair] New Arp 2600 questions

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Re: New Arp 2600 questions

AW: [vintagesynthrepair] New Arp 2600 questions

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