Help: Failed outputs on Alesis QS7.1 synth

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Help: Failed outputs on Alesis QS7.1 synth

Postby nothinglasts » Fri Apr 18, 2014 3:46 pm

I've been using an Alesis QS7.1 live for years and depend on its sound for my band, so switching keyboards is out of the question. Just recently all the outputs including the headphone jack failed; sound still comes through them, but its very very quiet and I have to turn my amp up to the max to even hear it. My temporary fix has been to send the headphone jack out into a mic preamp, then send that to the amp which is cranked to the max. This makes things sufficiently loud for rehearsal, but the signal to noise ratio sucks (picks up a lot of radio).

Does anybody know if this is an addressable issue? I've been searching online for a while now to no avail. Is there any other output on the keyboard that might work with some added equipment, like the digital ADAT? I'm not really familiar with all that stuff...

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Re: Help: Failed outputs on Alesis QS7.1 synth

Postby rhino » Fri Apr 18, 2014 5:48 pm

Welcome to the board!
Your screen name says it all. Technology fails given time.
Alesis (now Neumark) is very guarded with technical information. Let me look at my bootlegged schematic of the QS-8 and see if I can be of more help.

When the wise man points to the stars, the fool looks at the finger.
- Confucius
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Re: Help: Failed outputs on Alesis QS7.1 synth

Postby Yekuku » Sat Apr 19, 2014 10:29 am

Hi ,
a few years ago I had a QS6 with no output coming from the left & right channel, although headphones worked ok. it turned out to be a bad Fet transistor (J111) in the mute circuit.
Bill , this might come handy :)
It is all about sharing...
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Re: Help: Failed outputs on Alesis QS7.1 synth

Postby Dr808 » Tue Sep 23, 2014 11:43 pm

The same thing just happened to my QS6.2 recently. I've had my QS6.2 in my studio and have been using it for 9 years flawlessly. I just joined a band about a couple of months ago and I've been taking it to rehearsal every week. I just did my first couple of gigs this weekend. After setting it back up in the studio, I've noticed the left and right channel outputs are substantially lower than they should be with the volume slider set at the same setting I usually have it set at. I checked the headphones output and it's loud like it should be. I have a feeling my line outputs might be failing because they are awfully quiet now compared to just a couple of weeks ago running through the same mixer channel at the same mixer settings as before. Now, I have to turn up the input gain almost to the max to even hear the keyboard in the mix, thus, adding more noise to the signal. This SUX!!!!
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Re: Help: Failed outputs on Alesis QS7.1 synth

Postby musikrx » Sat Jun 13, 2015 1:21 am

I would love a copy of that qs8 schematic! Anyway you can post it here?

Thank you!
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