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Amplifier has blown supplied speakers and I need to find someone to repair the amp and repair/supply replacement speakers

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It would help to know where you are located and what the receiveer and speakers are.
Thanks,
Dan

Posted on May 21, 2008

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Where is the fuse in a xr1220 mixer.


which fuse?? main fuse? output fuses?

if the main fuse has blown & the device simply won't power up, replacing it will merely result in another blown fuse - you need to take it to someone who can repair the units' power supply

output fuses blow when speaker wires are shorted, or speakers fail short - they're on the main circuit board, but seeing you're asking, i'd suggest you don't open the unit, but take it to someone who knows what they're doing

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take speaker wires off amp if the lit is green then speaker are hooked up wrong or blown.

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No Power means no supply. Step by step troubleshooting is recommended. Start with the main source power,then the cable wires,then to the primary section of the circuit board.Some components may be busted already.

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The Amp doesn't come one. it shutdown after it was used.


There are three entries for this same device. If you have overposted these, the symptoms combining the three would indicate that one of the power amps has probably shorted and overloading the power supply till a fuse has blown DO NOT replace the fuse till unit is repaired.

This is not a do it yourself repair unless you are competent in electronic repair.

High power amps are easily damaged by intermittent speaker lead connections and shorts as well as overdriving them into too low a speaker impedance.

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I ran the amp in .5 ohms and it is only 1 ohm stable now the protect light comes on what could it b.


Blown protection circuit at best. Blown power supply and IC's at worst. Send it to a service center for an estimate, educated guess without having it on a bench in front of me $150-200 repair. To test for the possibility that it's not the amp, disconnect speakers and turn power on. If it stays clean, no"protection", check your subs for a shorted voice coil. Hope this helps.

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My amp is melting its 30amp fuse


Amp had a problem. Blown amplifier or power supply. It will need to be removed and repaired by a qualified tech. There's no way around it.

Apr 23, 2009 | Car Audio & Video

1 Answer

401s Rockford Fosgate Amp. Not turning on. No power light. Pos+ and GR- are solid. Thought it may be remote, so tried running a wire from the POS+ to REM to test it, no luck


Amp Failure:
There are many different ways that an amp can fail but the two most common failures are shorted output transistors and blown power supply transistors (< those are not blown). There are several types of protection circuits in amplifiers. The most common are over-current and thermal. The over-current protection is supposed to protect the output transistors. Sometimes it doesn't work well enough to prevent the failure of the output transistors but it will work well enough to shut the supply down before the power supply FETs are destroyed. If the amp remains in protect mode, goes into protect mode or blows the fuse as soon as the remote voltage is applied, shorted output transistors are almost certainly the cause. If the fuse protecting the amp is too large, if the protection circuit doesn't respond quickly enough or if the power supply is poorly designed, the power supply transistors may fail. If you see a lot of black soot on the power supply transistors (near the power transformer), the power supply transistors have failed. Soot on the board doesn't necessarily mean the transistors have failed. Sometimes, technicians don't clean up the mess from a previous failure. Transistor Failure/Checking Transistors:
In general, when a transistor fails, it will either short (common for output AND power supply transistors) or open (common for power supply transistors). Transistors act like valves. They control the current flowing through a circuit. A shorted transistor acts like a valve that's stuck open (passing too much current). In the case of an output transistor, the shorted transistors tries to deliver the full rail voltage to the speaker output terminal. If you've ever seen a damaged amp that pushed or pulled the speaker cone to its limits when the amp powered up (common on some Rockford amplifiers), that was almost certainly due to a shorted output transistor. When checking transistors, you most commonly look for shorted connections inside the transistor. You do this by using a multimeter to look for low resistance connections between the transistor's terminals. Note:
I used the terms short and open on the previous paragraph. A short (short circuit) is a path through which current flows that should not be there. An open (open circuit) is a break in the circuit.

These repairs are best left to a repair tech familiar with car audio amplifiers. Check with your local shop to get a reccomendation. If the light isnt even coming on, chances are your input or power supply has been taken out.

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1 Answer

No sound coming from speakers Blaupunkt GTA470 Amp


Amp Failure:
There are many different ways that an amp can fail but the two most common failures are shorted output transistors and blown power supply transistors (< those are not blown). There are several types of protection circuits in amplifiers. The most common are over-current and thermal. The over-current protection is supposed to protect the output transistors. Sometimes it doesn't work well enough to prevent the failure of the output transistors but it will work well enough to shut the supply down before the power supply FETs are destroyed. If the amp remains in protect mode, goes into protect mode or blows the fuse as soon as the remote voltage is applied, shorted output transistors are almost certainly the cause. If the fuse protecting the amp is too large, if the protection circuit doesn't respond quickly enough or if the power supply is poorly designed, the power supply transistors may fail. If you see a lot of black soot on the power supply transistors (near the power transformer), the power supply transistors have failed. Soot on the board doesn't necessarily mean the transistors have failed. Sometimes, technicians don't clean up the mess from a previous failure. Transistor Failure/Checking Transistors:
In general, when a transistor fails, it will either short (common for output AND power supply transistors) or open (common for power supply transistors). Transistors act like valves. They control the current flowing through a circuit. A shorted transistor acts like a valve that's stuck open (passing too much current). In the case of an output transistor, the shorted transistors tries to deliver the full rail voltage to the speaker output terminal. If you've ever seen a damaged amp that pushed or pulled the speaker cone to its limits when the amp powered up (common on some Rockford amplifiers), that was almost certainly due to a shorted output transistor. When checking transistors, you most commonly look for shorted connections inside the transistor. You do this by using a multimeter to look for low resistance connections between the transistor's terminals.

Dec 31, 2008 | Blaupunkt PCA460 Car Audio Amplifier

1 Answer

Amp turns on just fine but no sound comes out


Amp Failure:
There are many different ways that an amp can fail but the two most common failures are shorted output transistors and blown power supply transistors (< those are not blown). There are several types of protection circuits in amplifiers. The most common are over-current and thermal. The over-current protection is supposed to protect the output transistors. Sometimes it doesn't work well enough to prevent the failure of the output transistors but it will work well enough to shut the supply down before the power supply FETs are destroyed. If the amp remains in protect mode, goes into protect mode or blows the fuse as soon as the remote voltage is applied, shorted output transistors are almost certainly the cause. If the fuse protecting the amp is too large, if the protection circuit doesn't respond quickly enough or if the power supply is poorly designed, the power supply transistors may fail. If you see a lot of black soot on the power supply transistors (near the power transformer), the power supply transistors have failed. Soot on the board doesn't necessarily mean the transistors have failed. Sometimes, technicians don't clean up the mess from a previous failure. Transistor Failure/Checking Transistors:
In general, when a transistor fails, it will either short (common for output AND power supply transistors) or open (common for power supply transistors). Transistors act like valves. They control the current flowing through a circuit. A shorted transistor acts like a valve that's stuck open (passing too much current). In the case of an output transistor, the shorted transistors tries to deliver the full rail voltage to the speaker output terminal. If you've ever seen a damaged amp that pushed or pulled the speaker cone to its limits when the amp powered up (common on some Rockford amplifiers), that was almost certainly due to a shorted output transistor. When checking transistors, you most commonly look for shorted connections inside the transistor. You do this by using a multimeter to look for low resistance connections between the transistor's terminals.

Seems as you have blown an output. Seek repairs.

Dec 29, 2008 | Power Acoustik A3000DB Car Audio Amplifier

1 Answer

Amplifiers esc200


Hi! The fact that the LCD has power implies that the fault is in the Power Amp-Speaker stage.
Check 1: Check that your speakers are connected to the amplifier output properly.
check 2: If connection is proper check for power on/power off blips. If blips are heard the Power amp /speaker stage is ok .
check 3: If power on/off blip is heard then you have to check the source stage i.e CD/radio etc
Check 4: if blip is not heard. Disconnect the speaker and try with another. eliminate the case of a blown speaker by testing speaker on another system.
check 5: if speaker and source are ok. Treoubleshoot the amplifier Power supply stage with the followinghttp://www.howtodothings.com/electronics/how-to-fix-the-fuse-on-your-guitar-amplifier
check 5: if the power supply to power amp stage is ok troubleshoot the power amp stage with this guidehttp://www.howtodothings.com/electronics/how-to-fix-your-guitar-amplifier
If you still face problems feel free to contact me

Jul 01, 2008 | JBL ESC200 Shelf System

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