XL7 main-out's going dead???

Old Iron Giant · Post by **Old Iron Giant** » Fri Jul 03, 2009 2:45 am

I'm having an issue with my Emu-XL7's Main Audio outputs, Including the headphone jack.

It seems that now- to get any sound at all out of this Kit, I need to crank the
volume knob to Full-Maximum.
Note: It was not like this when i bought it.

any advice on this, would be much appreciated.

cartesia · Post by **cartesia** » Fri Jul 03, 2009 5:12 am

if it's the main and the headphone,

you should be safe from at least connection troubles..

Sure you didn't accidentally set something in one of the 1359725948137591875levels of menus? haha

Old Iron Giant · Post by **Old Iron Giant** » Fri Jul 03, 2009 5:53 am

cartesia wrote:if it's the main and the headphone,

you should be safe from at least connection troubles..

Sure you didn't accidentally set something in one of the 1359725948137591875levels of menus? haha

vary sure,
I even preformed a hardware initialization, and set everything back to factory specs. In hope it would solve the problem.

checked mixer levels, cables, tested everything possible..
I have a feeling its the same problem my Alesis ION is suffering from, *Dead Field-Effect-Transistors* If that's possible with these? If it is the case, I'd love to know whats causing this to happen.

Old Iron Giant · Post by **Old Iron Giant** » Sat Jul 04, 2009 6:30 pm

what could cause this problem in various Synth instruments?
anyone else ever suffer with this problem in any of their hardware?

Post by **madtheory** » Sun Jul 05, 2009 12:29 am

Dirty pot.

Old Iron Giant · Post by **Old Iron Giant** » Sun Jul 05, 2009 1:03 am

madtheory wrote:Dirty pot.

Even though I own a few synths, I'll be honest I'm new to this.
What would you suggest for repair?

Post by **madtheory** » Sun Jul 05, 2009 1:17 am

A hoover and Servisol. Go look up tutorials via Google. Tons of them out there.

Old Iron Giant · Post by **Old Iron Giant** » Sun Jul 05, 2009 1:59 am

madtheory wrote:A hoover and Servisol. Go look up tutorials via Google. Tons of them out there.

Thanks

Old Iron Giant · Post by **Old Iron Giant** » Sun Jul 05, 2009 3:12 am

Cleaned all the POT's with DeoxIT-G5.
Fixed JogWheel skipping, and the scratchy volume knob.
Unfortunately didn't fix the volume issue though

Post by **cornutt** » Sun Jul 05, 2009 5:38 am

Sounds to me like the output op-amp is going bad. This should be fixable. (Afraid I can't be of much help, though; this isn't a synth I'm familiar with.)

Old Iron Giant · Post by **Old Iron Giant** » Sun Jul 05, 2009 5:58 am

cornutt wrote:Sounds to me like the output op-amp is going bad. This should be fixable. (Afraid I can't be of much help, though; this isn't a synth I'm familiar with.)

what causes this to happen? so I can do some research, and solve this unfortunate problem.

Post by **madtheory** » Sun Jul 05, 2009 12:16 pm

Get the service manual and see what it says about checking the outputs. It isn't necessarily the op amp, it could be a faulty capacitor connected to it. It could more likely be a dry joint or a faulty volume pot.

The key to repair is diagnosis. Start with the simple stuff (leads, dry joints, faulty mechanical parts, leaking caps, calibration)), and work up to the more complicated stuff (failing ICs). You could replace the op amp and find the problem still exists, if you haven't diagnosed properly.

Technicians get manufacturere bulletins and communicate with each other, so they'll know which parts tend to fail, and what are common issues. That stuff isn't usually in the service manual. But it's sometimes on the web.

What causes ICs to fail? Now you're askin'!

Could be a design fault, where it's heating up too much for several reasons, could be a bad batch of components, etc. etc.

XL7 main-out's going dead???

XL7 main-out's going dead???

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