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Sad to say it's likely to be 1 or more transistors in the power amp circuit, although there are other possible causes.
Luckily the repair manual is available (hifiengine.com) and the power amp is built with discrete components, so it should be easily repaired
Most common causes would be an output transistor or dry solder joint(s) due to transistors / resistors getting hot and cooking a solder joint or 2.
Inspect all solder joints carefully with a magnifier, looking for signs of localised heating/burning and/or crysalisation of the solder.
It's normal to replace output transistors as a matched pair even when only one has failed, to minimise distortion. Replacement transistors should of course be as close to the original specs as possible (or better) if genuine parts are not available. The bias will need to be adjusted as per manual (1.5mV emitter to emitter of output transistors).
Good luck.
the power source specs are on a sticker on the device or online search for its specs
nothing wrong with universal power supplier from an after market power source supplier
You can find the spec sheet for the speakers here. The Behringer is rated 600 watts RMS at 4 ohms, right at the high end of the recommended level for the speakers. So it looks like a good match.
I have a PX-42VM5A and my Power supply is a PNT-426 (by Sanken Electric Co. LDT). Here are my specs: INPUT: AC 100-240V; OUTPUT: (there are nine outputs) +170v 1.6A; +60v 1.6A; +5v 4.0A; +2.5v 1.9A; +3.5v 1.9A; +7v 1.0A; +12v 0.5A; +12 v 1.9A and +6v 1.2A
DHD's web site doesn't appear to have a direct support link. Aslo, there's no support form or email address listed. I'd call them or send them a "snail mail" request.
Here's the information you need.
Address: 4480 Pacific Boulevard
Vernon, CA 90058
Telephone: 323.588.2999
It look like this is the PN p5nk50zfp.
This site has your part. Data sheet
This part, it might be your voltage regulator not the horizontal output transistor.
Good Luck.
First find out why you need to change this transistor, if it is shorted or open then replace it , but be carefull when you substitute parts which could create havoc, to check the spec's of these to components look up the 2n7000 note the specs and see how close the 2n2222 relates to , my recommendation is to get the original.
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