Question about Alpine MRD-M301 Car Audio Amplifier

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Amp turns on no output power wont power subs

Always turns on digital screen lights up menu works, no output power

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: powers up but no signal

Check your gain pots as well as audio pre outs on amp. sometimes pre outs will get loose and be unable to make a connection.

Posted on Jun 30, 2007

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  • 13 Answers

SOURCE: Kenwood KAC-749S

Try to take out the lights that you put in yourself, but do it carefully, as you might have bridged out the power connectors that go through to your subs.

Posted on Aug 15, 2007

colin324
  • 57 Answers

SOURCE: Lights on, nobody home

Appears to be an issue with current. Is the speaker the correct impedance for the amplifier ? Have you confirmed there are no short circuits in the wiring ? I'm not familiar with this particular product,

The alpine catalogue gives recommended amp/speaker combos. If you don't have an aplpine sub, then look at the specs and find a similar one. You may be trying to load the amp too heavily and it will protect itself.

Posted on Nov 21, 2007

  • 631 Answers

SOURCE: 250/1 powers on but no output

If the amp is not going into protect, the power supply FETs have probably failed. In the corner of the amp near the toriodal transformer, there are 4 FETs against the heatsink. When these fail, the 47 ohm resistors at the base of the transistors often fail. If the resistors are dark, it generally means the FETs have failed. If you disconnect the amp from power and measure the resistance from leg 1 to leg 2 of the power supply FETs, a reading of near 0 ohms indicates the FETs have failed.

Posted on Dec 31, 2007

SOURCE: no output

Maybe you should check your remote wire!

Posted on Jun 05, 2008

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