Nady Systems XA-900 Amplifier

First, plug it in. Next connect the speakers. Center all eq controls both master and channel. Turn off any reverb or effects. Turn the master volume 1/2 way up. Plug a sound source into channel 1 wiyj the channel volume all the way off. Turn on the amp. Slowly raise the channel volume until you heat output. If you get nothing, it's broken.

There are a couple reasons.
(a). If it's a regular older model Solid-state Amplifier, reason could be a faulty cooling fan.
(b). If it's a more recent Amplifier, reason could be a faulty Temperature Sensor attached to the heat-sink. A faulty fan could be the culprit as well.

If they r thermally activated.. Let amp heat up then check to c...if not thermal power switch for fans may b faulty if not fans themselves..

You'll want to use the Stereo Out connections at the top right. You might need adapters to plug into whatever system you're trying to use. Also note that this mixer does not provide power, so the speakers you're using have to be self-powered or be driven by a separate amplifier. You would then plug the Stereo Out connections into the INPUTs of the amplifier.

The amp top should be removed to check any fuses and the power transformer, a digital meter will be needed to run these tests, post back for instructions if you have one.

Serial #s are usually on the rear or bottom of the device. # of outputs- 2 subs & Mains L&R= 4

you can find the manual below.

http://nady.com/manuals/audio/pmx420.pdf


Good Luck mixing the Next Big Hit!!

Disconnect the speaker wires and see what happens.

Contact Nady directly at the number below. They will help with the part number and cost etc.

Dan

Contact: Customer Service Department at (510) 652-2411.

disconnect speakers at the amp, turn unit on, if it goes into protect, it needs service. If it stays on, re-connect speaker wires without speakers attatched at the other side and test again. (make sure wires are separated and not touching metal!) if it stays on still, check speakers one by one, when it goes into protection, you have found your problem. Disconnect the bad speaker and test again. Process of elimination. It can only be one of three things. Internal amp problem(nothing connected and protection) wires(no speakers connected and protection) or speaker(s) (when speaker connected,protection) Hope this helps. If you need deeper troubleshooting with this issue, post a comment and I can help you further.

check your speakers cables for short circuit-disconnect all speakers and connect them one by one until you find the bad one and when you find it try the cable first then the speaker -if all above failed you will have a problem in your amp and ask for help from service center