Question about Alphasonik PMA1800A Car Audio Amplifier

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I have an alphasonik pma 1800 class a/b bipolar amp. When power is applied, the led light flashes red. This happens with nothing but 12vdc, ground, and REM connected. I don't think its the wiring because I installed my kicker zx 2500.1 mono right after and it worked fine. Suggestions?

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

SOURCE:

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

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Posted on Jan 02, 2017

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Duncan

Mike Duncan

  • 219 Answers

SOURCE: Amp not putting out sound

This is not a problem that a normal comsumer should try to repair themselves. It's time to take it to a pro. It sounds like you have blown out at least one of your output channels. If you are getting any red light at all then the good news is that the power supply section of the amp is probably still good. About half of all the electronics in your amp is for the power supply section. The other half is for the actual amplifiers of the amp. Good luck, I hope it's not too bad.

Posted on Jun 14, 2007

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Anonymous

  • 152 Answers

SOURCE: amp works fine when car not running...shuts down when car started

It could be a problem with the head units remote wire (blue wire) that connects to the amp. It turns on the amp when the head unit is turned on, Check that wire for 12+ volts when head unit is on.

Be sure the amp is properly grounded,and the input and output signal (speaker) wires are connected.

You could also use a temp. jumper wire at the amp by jumping the power and remote terminals, just to see if the amp works.

Note: Do not leave the temp. jumper in place, amps are not meant to be continuously powered up. Make sure it is in a well ventilated area so as to disperse its heat.

Good luck
Aduz


Posted on Mar 15, 2009

hoyzee1

  • 150 Answers

SOURCE: how to wire pma100 voltmeter without amp

Hey dude- if you dont figure out how to wire that thing up -i need one for my pma-2500a i got it from the pawn shop yo for 150 bucks !!!!!!! shwinggggg its a beast 1600 rms at 4 ohms bridged - what a steal but yea i need one so lets make a deal dude !!!

Posted on Jun 19, 2009

Anonymous

  • 113 Answers

SOURCE: alphasonik amp is getting power but no power to subs

either your rca inputs are bad or your mosfets are bad

Posted on Jul 05, 2009

etirbynnor

Ronny Brite

  • 655 Answers

SOURCE: i have 2 kicker l7 12s 4ohm speakers and was

Hello gonenutz14,

It depends on how you define the "best way". Driving each sub with a separate 750 watt amp will result in about 50 percent more power than having them share the output from a single 1000 watt amp. But with 2 amps, there's more wiring issues to contend with and the adjustments are more complex. The 2 750 watt amps will cost more than a single 1000. Plus if the 1000 watt amp is stable to 1 ohm, the power difference will actually be less than 50 percent because of the lower impedance. But if the 750 watt amps are also stable to 1 ohm and their outputs can be combined, we're back to 2 being better than 1.

I'd say that the simplest, most economical way is to use a single amp. If maximum power to the subs is the highest priority, and cost and wiring is not an issue, then 2 is better.

Hope this helps.

Posted on Jul 12, 2009

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Your friend has damaged his amp. The power light coming on means that the amp's power indicator LED is at least working. That light is only there to tell you that the amp is receiving power on it's 12 volt rails, not that it's necessarily using the power in any way other than warming up the amp's internal circuitry. When you say the amp gets power, I'm not clear on whether you mean the amp works in that fashion, or there's just a red LED glowing but nothing else happens. The amp needs to be repaired, and I would suggest to him to not apply power to it again until it is checked by a professional. The power supply has probably been damaged, and it's possible, depending on how the amp was mounted, that it was searching for ground through the amp's chassis if it was screwed into metal at its mounting location. All that seems certain as of now is that the LED works, but nothing else, unfortunately.

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Hi,

The blinking light means the controller QA01 in the AV_TERM system board is booting and driving the TIMER/REC RED LED light accordingly. This failure mode is true for many conditions, not exclusively for the main PS board PE0071. It could be caused by many things, LOW B, SEINE, AV_TERM, LCD, PROTECT, etc.

Specifically for PE0071+12VDC circuit failure, which is the most common , listen for the LINE relays SR80, SR81 coming online. If several (3) or more clicks are present when applying power to the TV set then suspect the +12, 20, +32 VDC inverter is faulty.

As a quick check, you can disconnect P807B. If the relays cycle every 1-2 seconds then is most definitely the +12VDC inverter. Check for voltage level at optocoupler Q881 pin 4 and this should not be cycling. This point is the VCC for the oscillator. Repair or replace board 75002913 as necessary.

TROUBLESHOOTING: (this is my own, not the OEM !, try at your own risk!)

  1. Check for LINE1 input voltage level at inverter on sheet [4].
  2. Check for LINE2 input voltage level at inverter on sheet [3].
  3. Check for STBY +5VDC & +25 VDC ( observe correct GND REF) page [4]of PE0071 POWER
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  • P809B (11) POWER_SIG = 0.00 VDC (HIGH to Power on TV)
  • P809B (10) PROTECT = 0.00 VDC
  • P809B (9) ACDETECT = 3.00 VDC (+/-0.2)
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For +12 VDC Inverter, suspect components:

Q880 STR-W6765 PSR (works really hot!!)
C888-C890
D884A and related switching circuit components.

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mrwindex

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Hey dude- if you dont figure out how to wire that thing up -i need one for my pma-2500a i got it from the pawn shop yo for 150 bucks !!!!!!! shwinggggg its a beast 1600 rms at 4 ohms bridged - what a steal but yea i need one so lets make a deal dude !!!

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Amp works fine when car not running...shuts down when car started


It could be a problem with the head units remote wire (blue wire) that connects to the amp. It turns on the amp when the head unit is turned on, Check that wire for 12+ volts when head unit is on.

Be sure the amp is properly grounded,and the input and output signal (speaker) wires are connected.

You could also use a temp. jumper wire at the amp by jumping the power and remote terminals, just to see if the amp works.

Note: Do not leave the temp. jumper in place, amps are not meant to be continuously powered up. Make sure it is in a well ventilated area so as to disperse its heat.

Good luck
Aduz


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