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Thread
2006-04-21 by synthiaks2004
I just got a Arp 2600 MK III with 3620 Keyboard. But the keyboard doesn't work. It can sound but every time the key will get different pitch even I only press the same key again and again. Do you know what problem was that?
2006-04-22 by arp2600fan
--- In vintagesynthrepair@yahoogroups.com, "synthiaks2004" <synthiaks2004@...> wrote: > > I just got a Arp 2600 MK III with 3620 Keyboard. But the keyboard doesn't work. It can > sound but every time the key will get different pitch even I only press the same key again > and again. Do you know what problem was that? > My first guess is that the contacts need to be cleaned, but it could be more than that.
2006-04-22 by Masada Wilmot
It could well be a combination of dirty contacts and misalignment of the contacts. The ARP keyboard uses multiple contacts per key for CV & gates. The contacts need to connect & disconnect at different times to ensure that the sample/hold (memory) circuitry works correctly and latches the correct voltage. The service manual describes the process and is readily available on the web. Search the archives for contact cleaning procedures - you need to avoid removing the plating from the contact wires (assuming that there is still some left!) If cleaning/adjustment doesn't work then it could well be the S/H circuit itself. Is the pitch change random or does it lower each time you press the same key? Good Luck! mw
-----Original Message----- From: vintagesynthrepair@yahoogroups.com [mailto:vintagesynthrepair@yahoogroups.com] On Behalf Of arp2600fan Sent: Friday, April 21, 2006 11:12 PM To: vintagesynthrepair@yahoogroups.com Subject: [vintagesynthrepair] Re: Arp 3620 keyboard NOT Work --- In vintagesynthrepair@yahoogroups.com, "synthiaks2004" <synthiaks2004@...> wrote: > > I just got a Arp 2600 MK III with 3620 Keyboard. But the keyboard doesn't work. It can > sound but every time the key will get different pitch even I only press the same key again > and again. Do you know what problem was that? > My first guess is that the contacts need to be cleaned, but it could be more than that.
2006-04-24 by Ron Massaro
--- In vintagesynthrepair@yahoogroups.com, "synthiaks2004"
wrote:
>
> I just got a Arp 2600 MK III with 3620 Keyboard. But the keyboard doesn't work. It can
> sound but every time the key will get different pitch even I only press the same key
again
> and again. Do you know what problem was that?
>
My first guess is that the contacts need to be cleaned, but it could be more than that.
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