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Old 15th August 2012, 05:59 PM   #1
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Default mrp-500 is dead no output signal

I am willing to rip the case off and fix it myself (assuming i can get parts), just need to know where to look because visually everything looks fine. Anyone got schematics so i can trace the sound? My guess is dead mosfets or transistors.
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Old 15th August 2012, 06:17 PM   #2
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You need to confirm that you have sufficient power supply voltage. With your multimeter set to DC volts, the black meter probe on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red probe alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts on either the B+ or remote line, you need to check the wiring feeding whichever line is too low. If 'both' the B+ and remote turn-on lines are low and your battery is fully charged, you may have a bad ground connection.
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Old 15th August 2012, 06:32 PM   #3
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Quote:
Originally Posted by Perry Babin View Post
You need to confirm that you have sufficient power supply voltage. With your multimeter set to DC volts, the black meter probe on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red probe alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts on either the B+ or remote line, you need to check the wiring feeding whichever line is too low. If 'both' the B+ and remote turn-on lines are low and your battery is fully charged, you may have a bad ground connection.
its got plenty of power, and a good ground, ive tried 3 different audio sources too. i bought it used, and spend a whole weekend wiring it up to test it and find out no signal is coming out.
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Old 15th August 2012, 07:47 PM   #4
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Unless someone has the service manual, you'll need to post at least one good photo of the inside of the amp.

I'm assuming that you've checked the fuses.
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Old 15th August 2012, 11:26 PM   #5
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fuses are good.

inputs are at the top power ground and output is at the bottom

Click the image to open in full size.
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Old 16th August 2012, 02:19 AM   #6
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If you haven't done so already, read the basic repair page (link in sig line below). Read all of it, even the parts that you feel are irrelevant.

With the black probe on the ground terminal of the amp, what is the DC voltage on each of the 3 legs of Q9904 and 9905?
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