Question about Samson Servo 300 2-Channel Amplifier

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My samson servo 300's sound keeps cutting out, want to spray some electronic cleaner but not sure where ?

I hear a clicking sound like a relay from my Samson servo 300 then the music cuts out & comes back on after a short while, I have some electronic cleaner but it's not to be used on some plastics, so does anyone know the location of the relays that could be causing this problem or anyone have a solution to what this could be please, or a schematic diagram, I've took off the top & looked inside it looks to be clean, the fans are still working, maybe its the protect clicking on & off, but I'm still not sure, any help appreciated, thanks

Posted by GQUEST on

  • don_radvan
    don_radvan May 28, 2012

    Relay is in the back under the speaker connecters on the power supply board and is a sealed unit. Sounds, however, like your protection circuit is kicking in and the relay is correctly disconnecting the speakers. If the protection is coming on, the yellow PROTECT leds should light up on front. Could be a speaker short, over current, temperature or a failing power transistor. Could also be a faulty protection circuit.

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Yes; It maybe the protection coming on and off. This means there is a short in a speaker wire , or a blown speaker. The amp has 2 options for speaker hook up.1/4" plug and direct wire. If you are using direct wire it is possible to have frayed ends hanging around and can cause a short. You can test the speakers by unplugging them at the speaker, before you turn on the amp. Then turn it on, if the clicking still persist's turn off the amp and disconnect the speaker wires from the amp . Turn the amp back on. If the clicking still persists there is an internal problem with the amp. If not then you defiantly have either a wiring or speaker problem . You can test the speakers by using a 9v battery . Hook up the speaker wire to the speaker and put the battery on the other end of the wire, you should hear the speaker pop and see it move.If it moves it is still good. Note* this is also a good method of making sure your speakers are in phase. The battery is marked + & - the speaker will move forward when + is applied to the + of the speaker. make note of which wire is the +. if you get one speaker backwards it will cancel the sound of the bass. so hook the + to the red on the amp. Hope this helps you

Posted on Oct 07, 2013

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2 Related Answers

Anonymous

SOURCE: Samson Servo 170 - 1 dodgy channel

http://www.soundonsound.com/forum/showflat.php?Cat=&Number=403253&Main=351397

Posted on Dec 17, 2007

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Anonymous

  • 14 Answers

SOURCE: Samson Servo 170 Amplifier

check see if youy have some coving the vent or the speak connect right

Posted on Dec 22, 2007

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1 Answer

When I turn on the amp the indicator lights comw on and seem ok for 3 or 4 secs and then there is a click and the amp lights go out even though power is still showing as on.


Sounds like the amp is going into a protective mode.
Make sure your outputs aren't shorted.
If you're into electronics, look for bulging electrolytic capacitors or blown transistors.
Something is tripping the safety in the unit!

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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.

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I dont have The diagram
Carlos sorry :O[
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Hi...

This amp will need to be serviced

Check on the web for someone who does audio/stereo repair in your area

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Samson Servo 170 Amplifier


check see if youy have some coving the vent or the speak connect right

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http://www.soundonsound.com/forum/showflat.php?Cat=&Number=403253&Main=351397

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