Alesis QuadraVerb (repair help requested)
hui0262
I have a Quadraverb that I love. Right now she is very ill. The first
symptoms were her LCD was fading and went blank all together. I presume that
the LCD needs to be replaced. I've been mixing live sound for about 20
years, though I am not an electrical engineer. The only tool I have is a
multi-tester. If anyone would care to share some ideas with me, I would
greatly appreciate it. Please don't suggest I take it to a service center.
The closest one that would even know what a QuadraVerb is two hours away in
Atlanta. I have tried to find an LCD replacement part. I could only find one
company that had an QuadraVerb LCD and they quoted almost $80.00. I thought
was way to much. I would also be interested in buying a used or non-working
unit. That has a working LCD.
Thank you, Hassell McMillan Cradle Music Productions
Laurence Payne
>I have a Quadraverb that I love. Right now she is very ill. The first
>symptoms were her LCD was fading and went blank all together.
So what were the second symptoms? Anything that might suggest a power
supply failure?
Skler
Your inclination to get a second unit is probably best. Cheap way to
get parts too. With a coupleof units, you should be able to keep your
favorite effects working well past their supported lifetimes. :-)
If LCD is totally out, but unit still works otherwise, look for bad
driver IC or transistors for that part of the circuit. If LCD is only
dim, it could be a leaky filter capacitor. If there's a component
that's loading something down a great deal, you can look for it by
feel... See if there's an unusually warm transistor, driver IC or
capacitor (besides regulators or current limiting resistors in the
supply, which are normally hot). Could also be something as simple as
a cracked solder joint where a lead goes through a pad or a bad flat
ribbon connector, etc. I'm sure you'll get it working, but you may
have to invest a little to prove how much you like the sound of that
thing. :-)
Skler
Scott Dorsey
They all do that. You wll need to order a new one, and $80 is probably fair.
While the tech has it open, have him go through all the decouplng caps with
an ESR meter and replace any that are doubtful.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
Mike Gilmour
"Laurence Payne" <NOSPAMlpayne1ATdsl.pipex.com> wrote in message
news:61tub3p0kbtmmcq9l...@4ax.com...
From what I remember the LCD is lit by a couple of LED's, try to get hold of
a schematic and find a friendly tech as it could, as suggested, be just a
power supply problem. While you're at it I understand there is an iternal
battery that needs replacing after 'x' amount of years.
Best of luck,
Mike
Mike Gilmour
"Mike Gilmour" <mi...@tfjazz.freeserve.co.uk> wrote in message
news:YbGdnYfsCud...@pipex.net...
Please read 'internal' battery ...if it was eternal it would last forever
:-)
Preben Friis
> If LCD is totally out, but unit still works otherwise, look for bad
> driver IC or transistors for that part of the circuit. If LCD is only
> dim, it could be a leaky filter capacitor.
The orange LED backlight from QuadraVerb, DataDisk, and BRC are all above
their MTBF. I managed to replace the backlight in my BRC display with a
backlight taken from a LCD I bought for $20. Only drawback was, that it is
now green instead of orange.
If only the backlight is gone, it should be possible to see the letters if
you shine a light to the display at an angle. Spare LED backlights should
also be avilable through DigiKey.
/Preben Friis
hui0262
"Skler" <antc...@hotmail.com> wrote in message
news:1186953957.0...@57g2000hsv.googlegroups.com...
> On Aug 12, 2:15 pm, "hui0262" <cradlep...@webworkz.com> wrote:
> > Hello to all,
> >
> > I have a Quadraverb that I love. Right now she is very ill. The first
> > symptoms were her LCD was fading and went blank all together. I presume
that
> > the LCD needs to be replaced.
> >So what were the second symptoms? Anything that might suggest a power
supply failure?
Yes I think someone I let borrow the unit said they had a problem with
on/off push switch.
Thanks to Skler; Scott; Mike and Laurence, and anyone else I might have
missed to mention.
for all of your suggestions. If anyone knows where I might find a
schematic. Please let me know. Also I willing to buy some non-working unit
if anyone has one.
Thanks again !, Hassell McMillan Cradle Music Productions
Scott Dorsey
>
>Yes I think someone I let borrow the unit said they had a problem with
>on/off push switch.
Squirt a little Cramolin in there and see if the contacts clean up when you
do that.
> for all of your suggestions. If anyone knows where I might find a
>schematic.
It's in the service manual, which used to be available from Alesis. It might
still be in their current incarnation but it's true that they do seem to have
forgotten a lot of older products. It's at least worth calling to ask.
Please let me know. Also I willing to buy some non-working unit
>if anyone has one.
They show up, but they often have dead backlights.
Skler
Y'know, come to think of it, I've been re-building a lot of old gear
lately. I would recommend that once you have a tech involved and have
the thing open, just go ahead and replace ALL electrolytic and
tantalum capacitors that you find. Replacements are very cheap. Also,
I'd recommend replacing the battery on any old micro-processor based
gear.
Skler
Laurence Payne
<cradl...@webworkz.com> wrote:
>
>> >So what were the second symptoms? Anything that might suggest a power
>supply failure?
>
>Yes I think someone I let borrow the unit said they had a problem with
>on/off push switch.
So is it working, apart from the display? You said: " Right now she
is very ill. The first symptoms were her LCD was fading and went blank
all together." That suggests there are further problems? What are
they?
Ron Capik
I believe someone posted to either rec.audio.pro or alt.audio.pro.live-sound
with a
similar Q-verb problem several months ago months ago.
Do a google search for more details. Eventualy this link was posted:
====================================================================
URL for QuadraVerb replacement LCD
=====================================================================
Later...
Ron Capik
--
JohnO
> >company that had an QuadraVerb LCD and they quoted almost $80.00. I thought
> >was way to much. I would also be interested in buying a used or non-working
> >unit. That has a working LCD.
>
> They all do that. You wll need to order a new one, and $80 is probably fair.
I picked up a Quadraverb on Ebay 18 months ago for about $75. It
works perfectly, but I bought it with a less-than-stellar description,
a bit of a gamble. Known good ones go for about $100.
-John O
Gareth Magennis
"hui0262" <cradl...@webworkz.com> wrote in message
news:02000ae3$0$15492$c3e...@news.astraweb.com...
This is a common problem with Quadraverbs, the LCD module dies. If the
backlight only was not working you could still see the display.
This part is the one you want.
http://www.mouser.com/catalog/specsheets/M16327UYT.pdf
Gareth.
Gareth Magennis
Gareth Magennis
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Preben Friis
of him."
1851 Cor. 1:22, 23. "For the Jews require a sign, and the Greeks seek after
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[186]"But full of signs, full of wisdom; you the Jesuits, what you wish is a
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18710:26 "But ye believe not, because ye are not of my sheep."
188"Not because ye saw the miracles, but because ye... were filled."
18916. "This man is not of God, because he keepeth not the Sabbath day.
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[190]John 9:17, 33. "What sayest thou of him? He said, He is a prophet. If
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191Mark 9:39. Nemo est enim qui faciat. "There is no man which shall do a
miracle in my name, that can lightly speak evil of me."
192Ps. 138:24. "And see if there be any wicked way in me."
193Luke 22:66. "Art thou the Christ? tell us."
194John 5:36. "The works which the father hath given me to finish... bear
witness of me." John 10:26-27. "But ye believe not, because ye are not of my
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[195]"What sign shewest thou then, that we may see, and believe thee. (They
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196John 3:2. "No man can do these miracles that thou doest, except God be
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