Vintage Synth Repair

Hi,

I was wondering if there is anyone here who knows someone with 
knowledge of Arp Quadra's.

Playing or servicing.

I have the owner's and service manuals, and would need info. on some 
functionalities.

If anyone can help out, it would be greatly appreciated.

regards,

Marc L.

Hi Mike,

Yes, the strings and the bass are working great, it's the poly and 
the lead that are not working well, I'm not getting much from the 
sawtooth lead sound. Actually, all my brass sounds are not working.
I hope it can be fixed !!

cheers !!

Marc


--- In vintagesynthrepair@yahoogroups.com, mtcasino@c... wrote:
> Marc;
> 
> I had one back in the 70's. Nice strings on it.
> The origional schematics were in three collors so you could follow 
the signals easier. In fact they were the best I've ever saw !
> 
> Mike
>   ----- Original Message ----- 
>   From: mla_fontaine 
>   To: vintagesynthrepair@yahoogroups.com 
>   Sent: Wednesday, March 12, 2003 12:59 PM
>   Subject: [vintagesynthrepair] Arp Quadra
> 
> 
> 
>   Hi,
> 
>   I was wondering if there is anyone here who knows someone with 
>   knowledge of Arp Quadra's.
> 
>   Playing or servicing.
> 
>   I have the owner's and service manuals, and would need info. on 
some 
>   functionalities.
> 
>   If anyone can help out, it would be greatly appreciated.
> 
>   regards,
> 
>   Marc L.
> 
> 
> 
>         Yahoo! Groups Sponsor 
>               ADVERTISEMENT
>              
>        
>        
> 
>   To unsubscribe from this group, send an email to:
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> 
> 
> 
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Service.

Like how exactly ??

and how much out of tune ??

Marc


--- In vintagesynthrepair@yahoogroups.com, mtcasino@c... wrote:
> Marc;
> 
> After a number of years it would go way out of tune at any given 
time. Could have been embaracing.
> 
> 
> mike
>   ----- Original Message ----- 
>   From: mla_fontaine 
>   To: vintagesynthrepair@yahoogroups.com 
>   Sent: Wednesday, March 12, 2003 7:54 PM
>   Subject: [vintagesynthrepair] Re: Arp Quadra
> 
> 
> 
>   Hi Mike,
> 
>   Yes, the strings and the bass are working great, it's the poly 
and 
>   the lead that are not working well, I'm not getting much from the 
>   sawtooth lead sound. Actually, all my brass sounds are not 
working.
>   I hope it can be fixed !!
> 
>   cheers !!
> 
>   Marc
> 
> 
>   --- In vintagesynthrepair@yahoogroups.com, mtcasino@c... wrote:
>   > Marc;
>   > 
>   > I had one back in the 70's. Nice strings on it.
>   > The origional schematics were in three collors so you could 
follow 
>   the signals easier. In fact they were the best I've ever saw !
>   > 
>   > Mike
>   >   ----- Original Message ----- 
>   >   From: mla_fontaine 
>   >   To: vintagesynthrepair@yahoogroups.com 
>   >   Sent: Wednesday, March 12, 2003 12:59 PM
>   >   Subject: [vintagesynthrepair] Arp Quadra
>   > 
>   > 
>   > 
>   >   Hi,
>   > 
>   >   I was wondering if there is anyone here who knows someone 
with 
>   >   knowledge of Arp Quadra's.
>   > 
>   >   Playing or servicing.
>   > 
>   >   I have the owner's and service manuals, and would need info. 
on 
>   some 
>   >   functionalities.
>   > 
>   >   If anyone can help out, it would be greatly appreciated.
>   > 
>   >   regards,
>   > 
>   >   Marc L.
>   > 
>   > 
>   > 
>   >         Yahoo! Groups Sponsor 
>   >               ADVERTISEMENT
>   >              
>   >        
>   >        
>   > 
>   >   To unsubscribe from this group, send an email to:
>   >   vintagesynthrepair-unsubscribe@egroups.com
>   > 
>   > 
>   > 
>   >   Your use of Yahoo! Groups is subject to the Yahoo! Terms of 
>   Service.
> 
> 
>         Yahoo! Groups Sponsor 
>               ADVERTISEMENT
>              
>        
>        
> 
>   To unsubscribe from this group, send an email to:
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> 
> 
> 
>   Your use of Yahoo! Groups is subject to the Yahoo! Terms of 
Service.

Hi,
 
the only problem that he still hasn't resolved yet is when you put 
the phaser on the poly section, the sound cuts out after about 2-3 
seconds.

If you take the phaser off, it's fine.

the other three sections don't do that, they work fine.

any ideas ??

thanks.

Marc

--- In vintagesynthrepair@yahoogroups.com, mtcasino@c... wrote:
> Anywhare from a half octive to 2 and one half.
>   ----- Original Message ----- 
>   From: mla_fontaine 
>   To: vintagesynthrepair@yahoogroups.com 
>   Sent: Wednesday, March 12, 2003 11:07 PM
>   Subject: [vintagesynthrepair] Re: Arp Quadra
> 
> 
> 
>   Like how exactly ??
> 
>   and how much out of tune ??
> 
>   Marc
> 
> 
>   --- In vintagesynthrepair@yahoogroups.com, mtcasino@c... wrote:
>   > Marc;
>   > 
>   > After a number of years it would go way out of tune at any 
given 
>   time. Could have been embaracing.
>   > 
>   > 
>   > mike
>   >   ----- Original Message ----- 
>   >   From: mla_fontaine 
>   >   To: vintagesynthrepair@yahoogroups.com 
>   >   Sent: Wednesday, March 12, 2003 7:54 PM
>   >   Subject: [vintagesynthrepair] Re: Arp Quadra
>   > 
>   > 
>   > 
>   >   Hi Mike,
>   > 
>   >   Yes, the strings and the bass are working great, it's the 
poly 
>   and 
>   >   the lead that are not working well, I'm not getting much from 
the 
>   >   sawtooth lead sound. Actually, all my brass sounds are not 
>   working.
>   >   I hope it can be fixed !!
>   > 
>   >   cheers !!
>   > 
>   >   Marc
>   > 
>   > 
>   >   --- In vintagesynthrepair@yahoogroups.com, mtcasino@c... 
wrote:
>   >   > Marc;
>   >   > 
>   >   > I had one back in the 70's. Nice strings on it.
>   >   > The origional schematics were in three collors so you could 
>   follow 
>   >   the signals easier. In fact they were the best I've ever saw !
>   >   > 
>   >   > Mike
>   >   >   ----- Original Message ----- 
>   >   >   From: mla_fontaine 
>   >   >   To: vintagesynthrepair@yahoogroups.com 
>   >   >   Sent: Wednesday, March 12, 2003 12:59 PM
>   >   >   Subject: [vintagesynthrepair] Arp Quadra
>   >   > 
>   >   > 
>   >   > 
>   >   >   Hi,
>   >   > 
>   >   >   I was wondering if there is anyone here who knows someone 
>   with 
>   >   >   knowledge of Arp Quadra's.
>   >   > 
>   >   >   Playing or servicing.
>   >   > 
>   >   >   I have the owner's and service manuals, and would need 
info. 
>   on 
>   >   some 
>   >   >   functionalities.
>   >   > 
>   >   >   If anyone can help out, it would be greatly appreciated.
>   >   > 
>   >   >   regards,
>   >   > 
>   >   >   Marc L.
>   >   > 
>   >   > 
>   >   > 
>   >   >         Yahoo! Groups Sponsor 
>   >   >               ADVERTISEMENT
>   >   >              
>   >   >        
>   >   >        
>   >   > 
>   >   >   To unsubscribe from this group, send an email to:
>   >   >   vintagesynthrepair-unsubscribe@egroups.com
>   >   > 
>   >   > 
>   >   > 
>   >   >   Your use of Yahoo! Groups is subject to the Yahoo! Terms 
of 
>   >   Service.
>   > 
>   > 
>   >         Yahoo! Groups Sponsor 
>   >               ADVERTISEMENT
>   >              
>   >        
>   >        
>   > 
>   >   To unsubscribe from this group, send an email to:
>   >   vintagesynthrepair-unsubscribe@egroups.com
>   > 
>   > 
>   > 
>   >   Your use of Yahoo! Groups is subject to the Yahoo! Terms of 
>   Service.
> 
> 
>         Yahoo! Groups Sponsor 
>               ADVERTISEMENT
>              
>        
>        
> 
>   To unsubscribe from this group, send an email to:
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> 
> 
> 
>   Your use of Yahoo! Groups is subject to the Yahoo! Terms of 
Service.

Hello,
I'm new here, but not new to repairs.
I do a lot of Moog repairs and am always picking up new
tips and tricks (Always learning!).

I have an Arp Quadra that I am working on, and I have 
a couple of questions about the pitch bend (after touch).

Can anyone tell me what the resistance value of the pressure
sensor should be?

I would like to get it fixed, but I want to avoid just 
throwing parts at it.

When I measure the voltage while pressing it, it goes from
.000 volts to .032 volts.
If I measure the resistance, it goes from infinite to 
about 4.5 meg ohms.

Does this seem correct, or do I have a bad sensor strip?

Thanks in advance for your help.

GD

Hi Team,
Have any of you got an Arp Quadra?
I was wondering if you remove the processor/lead-mix/polyboard
interconnect board, if the presets/patch buttons still work on 
the touch panel?

I have a Quadra that is not responding to the touch panel.
When I received the synth the 2nd of the 5 volt reg. was putting
out 12 volts. This is the 5 volts that is connected to the 
lead-mix and polyboard, not the processor board.
The 5 volts to the processor board was and is normal.

I have purchased the 7400 series replacements for the lead-mix 
and polyboards, but need to know if the 12 volts may have 
reached the processor.

So if anyone could find out if the preset/patch buttons 
work without the interconnect board installed, 
that would be awesome! 


Thanks!!
GD

The question would be if the TTL has been damaged by the overvoltage,(12vs. 5 volts).I have seen personally TTL survive overvoltage conditions.