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Soundlab sp500, Was working perfectly, one day i turned it on the fan spins so still powered, but the lights on either channel are not lit and no sound output?

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Posted on Jan 02, 2017

techman
  • 3130 Answers

SOURCE: No sound from speakers

In most recivers or amps yes if there is a short in one channel all the amps go into shutdown or into the protect mode. Now if you know how an amp works then you should be able with a schematic to find out what amp is causing the over load simply by see in the schematic where the speaker output is on the curcuit and then measure for a DC B+ . Thats the amp you would disconnect to conferm that all the others were ok as an output on an amp curcuit shouldnt have more then .3 to .8 volts dc unless its unbalanced.. Seek a pro to assit you if you dont have the equipment to test the amp and for sure get a service manual or schematic diagram. Good Luck

Posted on May 16, 2006

  • 547 Answers

SOURCE: No sound from front left channel

Try swapping the connectors for front-left and front-right (just swap right at the back of the amp)

After the swap, does the front-left speaker work, and now the front-right is dead? If so, then it's a problem in the amp.
If not, then the problem is in the wiring and/or the front-left speaker itself.

Post back here with your findings, and we'll troubleshoot whichever part of the system is broken.

Posted on Apr 08, 2010

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Product Details and Features PLX-520
Key Features
Amplifier Type grayquestion.gif Dual Channel Bridgable grayquestion.gif Bridgable RMS Power at 2 Ohms 400 W x 2
Performance
Frequency Response 10 Hz - 50000 Hz Signal to Noise Ratio grayquestion.gif 102 dB THD at Rated RMS Power 0.01 %
Crossover / Equalizer
Bass Boost grayquestion.gif With Bass Boost Low - Pass Frequency 50 Hz - 120 Hz High - Pass Frequency 80 Hz - 800 Hz
Other Features
MOSFET Circuitry Yes 3 Way Ready Yes
Dimensions
Width 10.4 in. Depth 17.7 in. Height 2 in. ..This is what I found for logic soundlab PLX-520 Amplifier, hope its what you were looking for. Don't forget to rate answers.

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SoundLab SP500 Amplifier


I strongly recommend that you replace all output transistors at once, and the drivers also. Also look for arcing across small low value resistors about the output stages, and small signal diodes also for 0.6 volts barrier potential voltage(they often go short circuit also). soft start the amp with a variac if you have one, or an incandescent 60watt 240v(110v if in the US) lamp in series with mains power to limit the current that can flow to protect the amps circuits if there are still faulty parts about. Check
DC conditions everywhere you can. If both channels appear to be ok, Then some careful observation of voltages with a DMM will help you to find any more problems.
Amps by design with high potentials and direct coupling ascociated with DC feedback loops, make this sort of work hard to do even for an experienced tech as it is very easy to damage the parts you have previously replaced if you do not check things well enough before firing the unit up. Softstarting with a variac or some sort of limiting in the power supply are generally the safest ways to approach this sort of repair. If you dont think you are up to it, refer the work to an experienced audio tech, or hitme back here and I can assist you if you wanna have a crack at it. Cheers. A "fixya" rating would be great for my 2 cents worth here. :)

Jan 16, 2008 | Audio Players & Recorders

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