Schematic I have that mixer , power supply is upset ,I want repair it, please help me

You can get the entire service manual for this unit here:
BEHRINGER PMP6000 SCH Service Manual free download schematics eeprom...

Here is your schematic:

http://elektrotanya.com/behringer_xenyx_1622fx.pdf/download.html

Scroll down and find link "Get manual" and click to download.. IGNORE other download links they are for third party viewers. Power supply is on page 11. This is a switching power supply running from line voltage. For personal safety USE AN ISOLATION transformer when working on it. First thing is to measure all the voltage outputs before and during shutdown. Switching power supplies often require use of an oscilloscope to repair. The three terminal regulators that follow the main switching supply each have thermal shutdown so if one of them is being overloaded it will shutdown and that voltage will drop way down. Use great caution when working on the supply!!!

Soundcraft USA
8500 Balboa Boulevard
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CA 91329
TEL: 818.920.3212
FAX: 818.920.3208
EMAIL: [email protected]
WEB: http://www.soundcraft.com

Sound Technology plc
Letchworth Point
Letchworth
SG6 1ND
TEL: 01462 480000
EMAIL: [email protected]
WEB: http://www.soundtech.co.uk

Mr Jorg ter Veer
Audio Pro Elektroakustik GmbH
Pfaffenstrasse 25
74078 Heilbronn
TEL: +49 (7131) 2636 400
FAX: +49 (7131) 2636 430
EMAIL: [email protected]
WEB: http://www.audiopro.de

Soundcraft Homepage

Behringer will not release schematics unless you are an authorized service agent... however, sometimes you can make do with the few schematics floating around... What is the problem with the unit? They typically use a switching power supply and the schematics of those aree usually similar enough to repair them.

This is likely a power supply failure, possibly brought on by a failure of one of the amp channels.

This is probably close to your supply:

http://elektrotanya.com/behringer_sps600_power-supply_sch.pdf/download.html

Scroll down to "get manual" and click on that to download schematic. Ignore other download links.

Power supply probably failed. This is not a DIY for the inexperienced.

This will be close to your schematic: http://elektrotanya.com/behringer_pmh1000.pdf/download.html

Scroll down to "get manual" and click to download. IGNORE other download links.

You would need TWO DC supplies as they use AC so they can create both a plus and minus 15 volt power source to run the internal op amps.

Here is a schematic for the 1202 which has same power supply configuration as the 802.

http://elektrotanya.com/behringer_xenyx_1202.pdf/download.html

Scroll down to the little link "Get Manual" and download the service manual and schematic. You will find the power input in the upper left corner of page 5.

This isn't your model BUT it is likely so similar as to be close enough to work a power supply problem.

http://elektrotanya.com/soundcraft_folio_f1-6-i-p_mixer.pdf/download.html

These companies don't change designs very much between different models.

There is likely a voltage regulator or a diode burned out in the vicinity of the power supply. If you have the schematic, start at the power supply and work through the circuit to the I.C. Also look up the pinout on the internet for that I.C. With the power on test the voltages at each pin on the I.C. You should not have supply voltage readings on any of the signal pins. This is an indication that the I.C. is also burned out. Use a volt ohm meter with a D.C. voltage setting. Also hopefully your meter should have a diode test function. If not you can still test them with the resistance test function.Here is a link to an explanation:http://www.elexp.com/t_test.htm I hope this helps.