Question about QSC MX1500A 2-Channel Amplifier

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QSC 1420 pwr amp

Using this pwr amp to power a berringer 8 channel mixer. Channel 2 was giving a weaker signal than channel one and then channel two stopped working all together. Had a professional sound shop work on amp and after a $200.00 charge the tech said he had to re sodder the connections in channel two. Got it home...hooked it up and now same exact problem on channel 1. What's the chances it's the same thing? Wouldn't a tech person charging $200 check out all the connections?

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  • dmsonntag Jan 07, 2009

    Thanks VOTIT...I'm taking it back to the tech with your advice. He said he thought he checked it all out. Hmmmm???

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  • 2,071 Answers

The weaker signal caused by leaky capacitor and change value resistor is need to replaced with a new one so it's works normal again. Your tech did is re soldering the cold solder he did not replaced some defected parts.

Hope it may help you;

Regards;
VOTIT

Posted on Jan 07, 2009

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Features
 

  • 2-ohm dual (per channel) : 1200W
  • 4-ohm dual (per channel) : 900W
  • 8-ohm dual (per channel) : 600W
  • 4-ohm Bridge : 2500W
  • 8-ohm Bridge 2100W

  • Indicators for : Signal, Clip, Power, AC Mains, Fault, Bridge, Temp.
  • Housed in a rugged, all-steel 2U chassis
  • Microprocessor-controlled protection system.
  • Flow-through ventilation from front to back.
  • Internal heat sinks with forced-air cooling for rapid, uniform heat dissipation.
  • EIA Standard 19-inch rack mount width
  • Safe with all types of loads.(2 to 8 ohms in Stereo, 4 to 8 ohms in Bridge Mono.)

Inputs 

  • XLR-¼" combo connectors: One per channel
  • 3-pin female XLR connector and TRS ¼" phone jack accept balanced or unbalanced signals.
  • 3-pin Phoenix-style connectors (2-channel models only),One per channel, accepts balanced or unbalanced signals.

Output 

  • Balanced XLR connectors (2-channel models only)
  • One per channel, 3-pin male XLR connector in parallel with XLR-¼" combo and Phoenix-style input connectors for daisy-chain operation.
  • 5-Way binding post output connectors: One pair per channel; accept banana plugs, spade lugs or bare wire.
  • 4-Pole Speakon output connector (2-channel models only)
  • Accepts a 4-pole Speakon connector.

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There is a bad connection in the other channel or the speaker relay has a bad contact in it.

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