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Distorted sound ch.1and2 like low bias voltage ep2500

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Posted on Jan 02, 2017

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SOURCE: need schmatic for ep2500

http://www.qsc.com/support/library/schems/Current/RMX%20Series/rmx1850.pdf is a similar product, ie perfectly identical in most respects. This may not be trivial. Good luck.

Posted on Oct 22, 2007

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1 Answer

Distorted sound / fuse blows off when changing amp class.


The class A switch adjusts, via an optocoupler, the bias on the output transistors.
I would check the standard bias and class A bias adjustments.

Mar 22, 2014 | Marantz PM7200 2-Channel Amplifier

1 Answer

I have a behringer 2500. both channels are distorted but not out. what would need to be replaced.


It seems to me that you have a bad transistor, T14 or T13 to be precise. T14 most certainly is in short circuit or its companion T13 (T14 is a small signal NPN transistor whereas T13 is a small signal PNP transistor). I just fixed one with the same symptoms as yours. You should be able to measure T14 collector voltage against ground (metal chassis) and the reading must be very close to +15VDC. Also, measure T14 emitter voltage to ground and the reading must be very close to -15VDC. If any of those voltages is compromised, you will not be powering the amplifier's operational amplifiers (U4, U5, U6) right. Check T14 and T13 with your multimeter and replace them as needed. Also, keep in mind that after replacing any of those transistors you will be required to readjust the BIAS current for your amplifier's drivers, which by the way, is a very easy task to accomplish. You know your BIAS current is misadjusted when your output transistors get really hot even under no signal conditions or when your amplifier distorts at very low volume levels or on high frequencies amplifying. To adjust the BIAS current for channel 1's driver transistors, wait until the amplifier has cooled down, locate and adjust VR3 until you read 80 mV across R2. To adjust BIAS current for channel 2's driver transistors, locate VR6 and adjust it until you read 80mV across R106. You need to wait until the amplifier cools down to set BIAS current right, If the output transistors' heat sinks get hot before reaching proper BIAS current adjustments, wait until they cool down to average room temperature and retake BIAS current adjustment. Once both channels BIAS currents have been readjusted, apply a thin coat of thick nail polish to the sides of VR3 and VR6 to keep vibration from misadjusting BIAS currents again... T14 goes down under severe BIAS currents shifting and it just makes me wonder as to why BEHRINGER does not apply a setting substance to VR3 and VR6 so they do not shift under sever vibration conditions, after all, almost any major amplifier manufacturer in the world does it. Good luck!

Nov 10, 2012 | Behringer EUROPOWER EP2500 Amplifier

1 Answer

Behringer amp 240 to 120 volts


What you may need is a

Voltage converter ' Voltage Transformer ' step up and step down ...

Connect the 220V line output to EP2500

And the 110V input to your 110V convenient outlet

Aug 20, 2012 | Behringer EUROPOWER EP2500 Amplifier

1 Answer

Clipping the channels


The manual discusses the Clip Inidicator and how to deal with clipping.

Clipping in this amp isprimarily a function of the input signal being distorted so the input level is recommended to be lowered. Beyond that the cause of input distortion would have to be addressed in the device producing it.

http://www.retrevo.com/support/Behringer-EP2500-Amps-manual/id/23281ci655/t/2/

Dec 30, 2010 | Behringer EUROPOWER EP2500 Amplifier

2 Answers

Behringer EP2500 Clip light Channel 2 stays on & heatsink HOT!


There are so many components that can fail that troubleshooting this can be an expensive problem.

HINT: Put a 150 Watt light bulb in series with the power going into to limit current for/during troubleshooting.

Go through and compare the voltages on the teo channels. If power amp transistors have failed, likely the driver transistors also are gone.

Testing components in-circuit is very dificult. Resistors are pretty reliable and usually show damage by discoloration.

Furhter use before repairing MAY cause further damage.

Jun 03, 2010 | Behringer EUROPOWER EP2500 Amplifier

1 Answer

Distorted sound.


try to set up again may be cable instalation not properly to set

Aug 13, 2009 | Sony Xplod 1200W Class AB Bridgeable 2-Ch....

1 Answer

Sony trinitron tv kv type


The screen voltage adjustment should be on the back of the high voltage multiplier. It should be marked as "Screen", or "G2". Next to it, is the "Focus" adjustment.

Some models of Sony sets have two focus adjustments. This is for H and V focus.

When increasing the screen voltage will usually increase the wear factor of the electron-gun assembly in the CRT. This is because it is increasing the screen bias current.

When increasing the screen bias, the brightness will increase a little. When the CRT is weak, this may produce visible retrace lines more so than on a good working CRT. This is because the excessive screen current will stop allowing the electron-gun assembly to work at its proper cut-off level in order to allow the blanking drive to bias it off during the retrace period.

Increasing the screen bias will usually cause a shift in the colour temperature especially in the low level gray colours. This is because the AKG reference for the electron-gun biases will be offset due to the differences in the electron gun performance characteristics change.


Jerry G.



May 03, 2008 | Sony FD Trinitron WEGA KV-36HS510 36" TV

1 Answer

I own a classic Sansui intergrated amplifier (AU-717). It has a short in one channel. At low volume, the sound shorts out. I've had this unit for about 20 years now. Otherwise, it's a great product!


Hi mellemcee


Cool amp mate, and becoming collectable now to. Sansui amps from the era where the best in the world of HiFi. iT may have lost bias control to the offending channel, it may have dirty source switches, tape monitor switch, or even speaker switching. The speaker protection relay may also have a dirty contact, will usually burst back into life with a quick rotation of the vol control. Can you pin the problem down a little more with the info i have given you, try all the controls to see if it impacts on operations, you will need to fix those problems first. Low bias would make that channel sound distorted at low levels also. Is this what is happening to you??

regards
Graeme

Apr 18, 2008 | Audio Players & Recorders

2 Answers

Need schmatic for ep2500


check preamps small parts! maybe you have change value capacitors and resistors!

Sep 13, 2007 | Behringer EUROPOWER EP2500 Amplifier

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