Question about Alpine MRD-M1005 Car Audio Amplifier

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Repair assist needed

Q306 is very hot-also replacement is same.   zd903 is shorted out I need to know the value???

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Re: repair assist needed

I need you to be more specific, what do you mean value? You mean the price of the ZD 903?

Posted on Oct 21, 2007

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I have a kole amplifier 4 channel 720 and It wont come out of protection mode. red light on and wont go to green. Its not overheated nor has it ever been hot. Is their something internal i can repair to...

The red light is an indication of an internal short circuit. First things first, try disconnecting all the speaker connections and turn it on to see if any of your speakers are burnt and shorting. If that does not make any difference it means you have lost one or more MOSFET transistors in the amplifiers output stage. You will need professional help to replace those.

Jun 16, 2011 | Kole audio HK720-4 Car Audio Amplifier

1 Answer

A short when u connect power and protection is on

Hi Martin,
Yes protect is an error code for short and overload. Once the power applied to the unit and shorts sensed by the processor the unit will automatically turned to "protect" to avoid further damaged to other parts. Shorts is in the supply voltage (B+, Vcc) line and most common caused is the sound output IC (mounted in heat sink). This part is responsible for amplifying the audio from the pre-amplifier stage and will feed to your speakers.
If you have a knowledge in disoldering and soldering technique, I would advice you to pull-out this part and then try the unit. If the protect error code is gone then you must replaced this IC with a new one to back your unit in normal operation again.
Let me know if you need further assistance.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

May 20, 2011 | Crunch MXB2125 Car Audio Amplifier

1 Answer

Need a schematic to follow circuits on kx800.2 amp. A 10 ohm resister 1/4W was smoked and need to trace the problem. This circuit area is just after the pre-amp board socket.

Hi! ok R64 is a 220 ω resistor & Q22 is a BD140 transistor, these 2 components are the final outputs for the -15V rail which feeds the pre-amp board. There are two scenarios here, firstly Q22 may have died of natural causes which has killed R64 or something has gone short on the pre-amp board which has taken both components out as a result. i would suggest replacing the two cooked components & if the amp then works ok it will be an easy repair, however if they go again then an investigation using an ohm meter will be needed on the pre-amp board to check for shorts on all any of the i.c's. let me know how you get on, if I can be of further assistance just ask!. Regards, acbva.

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Nov 11, 2009 | Hifonics XX-Colossus II Car Audio...

2 Answers

Protection light stays on even when everything is disconnected.the output transistors are turning red hot instantly and it has a 20 amp draw on it.while it is hooked up to a power supply with no sound...

there is a short somewhere one your board that is putting all the load on your output transistors follow the traces on the board both ways to find the short

Jul 05, 2009 | Power Acoustik GOTHIC OV2-1800 Car Amp

1 Answer

Need help

If the fuses only blow after remote turn-on voltage is applied to the amplifier, the amp probably has shorted output transistors. If that's the case, they will need to be replaced.

If you're interested in repairing it yourself, read through the following page.

Amplifier Repair Primer

Let me know if you have any other questions.

Aug 26, 2008 | Kenwood KAC-7251 Car Audio Amplifier

1 Answer

I need phoenix gold 600.2 ti elite schematics for repair

PG doesn't release schematics but they may provide the value of the resistors. If they won't, he can probably use the other channel to get the values. If that won't work, let me know which resistors are burned and I'll see if I can find the information.

Tell him to email me directly to save some time.

Jul 25, 2008 | Car Amplifiers

1 Answer

Car amplifier parts repair question

Does'nt matter what brand, and you seem to know about keeping the correct values etc. What I would look for are Audio grade caps.
If it's a powerful system I usually put higher values in rather than the stated values on the caps, providing the physical size is correct.
Don't know if you still have the user manual but it's here if you want it.

Mar 17, 2008 | Car Amplifiers

1 Answer


If the amp gets hot or goes into protection with no input signal and no speakers/wires connected to the speaker terminals, the amp likely has shorted output transistors. It's not a complex amp. Any reputable shop should be able to repair it.

Sep 16, 2007 | PPI DCX-600.4 Car Audio Amplifier

1 Answer

Spl amp 2400 watts

do you know how to trouble shoot solid state devices??? if so then what you need to do is disconnect the collector if its a transistor output device or the b+ leg if its an Ic output device and then measure the ohms between the emitter and the collector or on an ic device the B+ leg to the outpot leg. If its shorted Your gonna need a schematic most likly to trace the path of the short.. if you dont understand this then you will need to take it to a repair shop and let them do the repair as you may not be up to a componet level type repair.. BUT if you are please get the schematic diagram and post it attention to me and i will be more then happy to assist you with this repair. Good luck

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