Question about Sonance Sonamp 1250 12-Channel Amplifier

1 Answer

No output from the speaker

The amp powers up and the active light comes on. ac light comes but no signal i checked the fuse all's good. even all the fuse inside. amp comes on but no signal from speakers.

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  • plukee Jul 25, 2008





    amp power up but no signal from the speakers,i have check the preamp and it seem to be ok. could anyone help me out.

    need my music





  • plukee Aug 12, 2008





    NO POWER TO THE SPEAKERS

    ALL LIGHTS ARE ON



  • B Carson May 11, 2010

    A 12 channel amplifier? The 12 channel devices I have met are only "mixers". Is your designed with enough power to run speakers?

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  • Master
  • 682 Answers

Please check first your input source and confirm it is ok.-check speaker button is pressed(if you have one)-speaker cables are connected firmly-from amp side and speaker side-check mute button(also if you have one)is not pressed.-make reset for your system(power off and on).
if all above can not fix your problem you have to ask for help from service center.

Posted on Jul 23, 2008

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1 Answer

The Amp clip light is always ON only the left channel and the same channel is not functioning by giving sound, please help


I looked at a schematic for EP2500 which is same but has a lower buss voltage than the EP4000. Below, the drive signal to the power stage is full wave rectified to illuminate the LED, d-c is presented to the LED if R128 & R138 has an a-c return. There is a line that can push-up the a-c return. It goes off to a connector that is unknown. I suspect the push-up voltage is not there. It could mean anything. I think its coming from the main transformer, Check for blow fuses.
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Also the speaker output is protected with a "Crowbar" circuit. It is simply a Triac device (light dimmer) or two SCRs to prevent d-c from shorted output devices being applied to the speakers. which would cook the speaker coils. This may be activated when amp is turned on. Then there is the possibility of the output power devices - one or more shorted.
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The amp needs to be checked out by a repair technician.

Feb 04, 2016 | Behringer EuroPower EP4000 2Channel...

1 Answer

I have a crown xls602 with no audio. Speaker and power relays activates normally, signal leds palpitates with input but no sound. Appreciate any help. Thank ou.


- Use your favourite search engine (Webcrawler is dandy) and type your question/info into it.
- SEARCH ENGINES ARE YOUR FRIEND!!! Type in keywords and check the results.

- I'm not an expert but it almost sounds like maybe a speaker relay or whatever on the amp has bailed out.

Good Luck :)
R

Feb 13, 2015 | Crown XLS 602 2-Channel Amplifier

1 Answer

Amp light not working and one dead right channel


Without knowing how it's actually laid out, I'd surmise the output amplifier transistors in the right channel are shorted, the fuse for that channel may be blown, and the speaker protection circuit is keeping it turned off. Most amplifier speaker protectors disable both channels if there is a problem, but yours could be different. I surmise the lights you mention are directly connected to the speaker protector chips and indicate readiness for normal operation. If it takes a few seconds for them to come on after power-up, that lends credence to my hypothesis.
Unplug the amplifier, open it up, and measure the resistance from the right channel output to each of the output power supplies (or to the fuse for the output power supply for that channel, if present). If one or both is very low (i. e, close to zero), you have a fried transistor. If that is the case, it is probably a good idea to replace the complementary transistor connecting the speaker to the other power supply even if it tests good; it may have been overloaded when the first one shorted. In many amplifiers, the transistors are inside a hybrid amplifier module, so you would have to replace the entire module. In some amps, you have multiple transistors in parallel; here you can probably keep the transistors that were in parallel with the failed unit, but I'd still recommend changing the complementary transistors.

Apr 23, 2014 | Volfenhag ZX-5168 2-Channel 4000W...

1 Answer

Crown XLS 602 power amp: Where inside is the fuse so I can replace it?


Hi Tom,

The fuse you may be referring from the power supply is not

used(none) instead a CB1 or circuit breaker is installed.

These breaker is in series with the power transformer ( trace it).


Disconnect the AC outputs of the power transformer when trying to

reset.( of course with the unit unplugged ).


Measure the output AC voltages, if it is OK

Be happy partially!


Next would be.....


Check for possible shorts on the Positive and Negative Supply

rails to ground or speaker out, for what might have caused the

breaker to tripped.


And these wont be easy troubleshooting , Good luck!!


thanks for choosing Fixya for assistance.

Dec 01, 2012 | Crown XLS 602 2-Channel Amplifier

1 Answer

No sound coming with protection light on


It's either overheated or you may have faulty speaker wiring or a shorted speaker. These directions come from a Samson servo 120a but the theory is the same.

The following conditions will cause the Protection LED to go on:

Initial power-up: For approximately five seconds after initial power-up, the relay

speaker connection circuitry is deactivated and the speaker output is muted. If everything is operating normally, you will hear an audible click at the conclusion of this brief period, as the circuitry is activated and the Servo 120a begins delivering signal to connected speakers (at which point the Speaker LED will light if the Speaker on/off switch is in its "in" position). It is normal for the Protection LED to fade gradually after the amplifier is powered off.

Overheating: A temperature sensing device in the Servo 120a will cause the relay speaker connection circuitry to be activated (and the Protection LED to go on) whenever the operating temperature of the unit rises above a safe level. To guard against this problem, make sure the Servo 120a receives adequate ventilation on all sides ; in extreme environmental conditions, you may also

want to consider the use of cooling fans.

Severe overcurrent conditions: This occurs whenever the signal being output

from the Servo 120a rises to a level above 20% THD (Total Harmonic Distortion).

Shorted speaker cables: This will occur if, due to faulty wiring, the hot and ground signals being output by the Servo 120a short to one another.

Output impedance drops below 2 ohms: This can occur if the Servo 120a is connected to inappropriate speaker systems (see the "Setting Up and Using the Servo 120a" section in this manual for more information).

DC voltage detected at speaker output: The most likely cause of this is an internal failure. In general, any time the Protection LED lights up (other than during the approximately five seconds following initial power-up), there is reason to be concerned. If this occurs, turn the Servo 120a off immediately and carefully check all wiring and external devices in order to locate and correct the condition that caused the LED to light up in the first place.

Dec 27, 2010 | Samson Servo 170 Amplifier

1 Answer

When switched on at the mains the power light is all that works


If your speakers are making this noise on switch on please disconnect them and check out if they the speakers are damaged by a continuity test of the impedance. It must show the marked resistance without a short. Then you are lucky. Next open the amplifier and check out on the output side and the power side for failure of mains capacitors/ output drivers/faulty coupling capacitors. Connect a resistance loaded test- speakers whenyou do this test .Switch on and put the set on fopr voltage checks from the output to the preamp. By a signal test you will be able to analyse the gain factor of all teh corresponding stages.It might be possible that your amp is old and some electrolytics have dried up.If so put the amp on for some considerable time and confirm if there is response building up on the controls and panels slowly. If so check onthe board for the suspected passive components and replace all suspected capacitors. Also resolder the main pcb for bad connectivity. I am surre this must work but attampt only if your are familiar to doing this repair. Good day

Jul 05, 2010 | Amplifiers & Preamps

1 Answer

I have the Behringer 10watt amp used but it wont power on at all...


Please open the amplifier and check from the power supply to the output section. You will need a multimeter to check for the ac input , then the fuses, the switch continutiy and the output secondary section ac. Now the DC to the circuits, the rectifiers, the filter capacitors, fusible resistors. Once the power is coming over to the main board and to the output drive, the premap section needs a check . The fault will be around this section if the outputs are clean. hope this helps.Good day

Jun 10, 2010 | Behringer Amplifiers & Preamps

1 Answer

My Sonance 2100 has no output


Ensure that the power button is pressed in. Set the Auto-On switch on the rear panel to the OFF positon. If the green light comes on the amp was not seeing any signal to trip the Auto-On feature to turn on. Check the source and RCA cable connected to the amp.
If no green light, then the internal fuses are blown. Have a certified technician handle that repair to avoid a shock hazard.

Jun 14, 2008 | Sonance 2120T 2-Channel Amplifier

4 Answers

Behringer amp


Hello pare ko.
EP2500 is a pro amp, manufacturer says that. Notorious to me.
Got 5 of these for repair. Clip is of course cause by too much
signal from source. If the amp is still clipped or on protect even w/out
signal in, time to open and do repairs inside. usually a MOSFET
inside P50N06 (50V-60A) is kaput. or MJE15033G and MJE15032G.
Now if blowing main Fuse, main txistor 2SA1943/2SC5200 maybe gone.
Read carefully the setting of your dip switches setting at the back.
This amp can drive 750 watts/ch@4 ohms.

Good Luck From Siliconchip

Nov 11, 2007 | Behringer EUROPOWER EP2500 Amplifier

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