I do not get any sound from my ouput, I have it installed correctly

Hi,
What you need to do is connect (for example" Aux 1 send from the desk to the Left Input of the alesis. Then connect the Left and right output form the Alesis to Auxilery return 1 and 2. You can just use the left ouput and use aux return 1 if having mono effects is ok.

You should contact Authorized Service Center and urge them to manage to get it.

A shorted speaker cable could cause this... however, what you do is to replace the fuse BUT wire a 150 Watt lamp in series with the power input... This acts as a resetable fuse for testing. If the lamp stays lit, you still have a failure.

In the control panel, sounds and devices, check that the device is in each list under audio, voice, and hardware tabs and that your device is the default device. If NOT in the list, the CORRECT drivers are NOT installed or not properly installed.

As a guitar player myself learn that not all speaker from some amps hold the ouput wattage. The fuse could ba a problem or the speaker is giving out.

You likely have not got the driver installed correctely. In Windows type machines OFTEN you must install the software driver BEFORE the device is tied to the computer. It sounds like you are on an Apple machine. Look for cautions regarding connection before software is installed.

Open the unit and inspect for damage and repair as necessary. It does no good to just look at it. Likely something has fallen into the speaker and damage could be worsened if you don't repair it before trying to use it,

probably a bad reverb tank. there is a little inductor inside that shorts out easily/common. you cant repair it. its just easier to order a new tank. what you do to test is........turn on the amp with the reverb turned up all the way........ volume up on the amp at normal playing level.....then tap or knock on the reverb tank itself......if you get sound then the output of the tank is good/ no sound the ouput side is dead.......then what you do is unplug the ouput of the tank and plug the output wire to the input of the tank and tap/knock on it again....if you get sound then the input side of the tank is good/ no sound is dead. this is a way to test the tank independently from input to output. which side is bad is irrelevant, what is improtant is determining if the tank is toast. i can get accutronics tanks from my distributor at a better price than anywhere else. email me thru my contact page on my website with the tank code numbers and letters so i can get you a price also check my price with whats on ebay, etc. my website is yostamplifier.com
good luck

Go to www.korgpa.com/pa_root/pdf/pa800/Pa800-200UM-ENG.pdf.Page 226 has the audio output section.Page 19 has the rear panel explanation. Left/Right: These are the main stereo outputs. Use them to send the final stereo mix to an external device. Connect either to get a mono output. Set the output level with the Master Volume slider. 1/1: These are the sub outputs. Use these to create a stereo submix of just some tracks or to output just a single instrument to be mixed alone or to be processed or amplified externally. Not: the Master Volume slider has no effect on these outputs. Signal is sent dry with no effects applied. Hope this helps.

Go to http://www.thedx7.co.uk/ Click on 14 Battery Change which is a walkthrough. You will; have to do a sysex data dump to restore the sounds. All that info should be on that site as well as some other great stuff. Hope this helps.