found one. Will need $50, but have to test it for you first. Will do that today. Regards Tim
On Saturday, July 19, 2014 4:19 AM, "Robert Stewart bob@... [yamahacs80]" wrote:
?
Hi Tim
Any news on the 150?
Cheers
Bob
On 18/07/2014 08:25, Tim Conniff
tconno@... [yamahacs80] wrote:
?
dummy load may become pivotal in determining
the source of the issue.
Alternatively, of course, you could
substitute another source of power if available, and i
don't mean another cs50 supply, I mean ANY other
capable source.?
Given the whine's prevalence on the power
lines, you might also want to disconnect the juice to
the voice cards all at once and see if it's still
being heard, just to further rule out stuff.
Btw, I have found a 150, just haven't had
time to check it yet.
good luck
Tim
On
Thursday, July 17, 2014 11:38 PM, "Bob Stewart
bob@... [yamahacs80]"
wrote:
?
I don't have a dummy load
unfortunatley,?but did short the sense
lines?and look at it.
Seemed to be OK, but might need to
run it for a while to let it warm up
first.
Might just be that something's
beginning to fail under load. Just
really annoying that it's showing up
on all the power lines. Might have a
chance to look at it further today,
but have a MonoPoly to tune, and a
Prophet 5 to diagnose over at a
clients.
On Friday, July 18, 2014, Tim
Conniff tconno@...
[yamahacs80] < yamahacs80@...>
wrote:
?
Can you
remove the supply,
give it all needed
dummy loads, and or
short sense lines to
their respective
power lines? Then
you can determine if
it is strictly from
the supply, or a
function of the load
inducing a resonant
freq, or other
anomaly. I assume
you have a scope.
Tim
?
Only two
fuses on the
CS50.
Voltages
are all there,
but there's
this signal
sitting on top
of them.
Synth
works fine
other than the
whine, and a
duff LFO chip.
Thinking
it's got to be
a duff
semiconductor/
IC on the PSU
:-(
B
On Friday,
July 18, 2014,
laurie laurie@...
[yamahacs80]
< yamahacs80@...>
wrote:
?
are all 3
fuses intact?
?
?
Hi
Just servicing
a CS50, and
it's
constantly
outputting a
whine of about
4120Hz.
Unit came to
me a bit
battered as
the PSU had
shaken loose
and trashed a
few things
inside.
PSU PCB had
become
cracked, so
replaced that
with a working
one purchased
from
Synthparts.
Recapped the
new PCB before
I fitted it.
I've done the
usual, changed
the logic on
the KAS board
and the S/H
board,
replaced power
decoupling
caps
throughout
etc.
The only
difference is
that
originally it
took a minute
or so to
manifest...
now it
manifests
immediately.
I can see the
signal on all
power lines.
Any thoughts?
B
?
|
