Dave:
I don't know if the Arp 3604 keyboard uses
Pratt-Read Bushing, but they worked on my Odyssey just fine.
Mike Casino
----- Original Message -----From: djbrow54Sent: Saturday, July 27, 2002 11:31 PMSubject: [vintagesynthrepair] Help - ARP 3604 KeyboardI'm trying to restore an Arp 3604 keyboard. Several questions.
First, the keys stick in the upright position until the first time
you depress them. Then they are fine for about 6 hours at which
point they are stuck again. I've removed them all and cleaned and
regreased them. Any clues as to what's happening?
Any good ways of cleaning the bus bars. I've gone over them with
alcohol but nothing came off. They're pretty bad. I was thinking of
some 600 grit sandpaper and slightly burnishing them.
My real issue is the CV output. It's fine up until the input to the
potted module on the circuit board. It's a Dynamic Measurements Corp
148-130 module. It's pulling the CV negative. I've removed the
module and am running the CV straight from the input. The keyboard
divider chain is working fine except there is no hold function for
the CV. Funny, there is no gate input to this module so I don't know
how it's supposed to know when to hold the voltage.
Does anyone have schematics for this keyboard or any information on
the Dynamic Measurements Corp module? It's got a date code of '74 on
the bottom. I'm trying to unpot it but it's not going very well.
Thanks. - Dave
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