Question about Jensen XA4150 Car Audio Amplifier

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Problems with amp...

If the transistors are blown could it be posible to buy them and reinstal manualy? Or they can be reinstaled only in manufacter service?

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If you have some idea about installation procedure it wont be a big deal to fix it by yourself

Posted on Jan 06, 2008

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Posted on Jan 02, 2017

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Crt standard hisense tv no power fuses are not open only switchmode transistor is shorted is that posible.


Sometimes is possible. Because, when the transistor shorts, the small value load resistor connected to its emitter might blown up before the fuse.

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Playing too loud music has blown my amp


maybe because your amp is overload, try to load 8 ohms single speaker per channel, then try to playing loud, if blown your amp again, the power transistors bias maybe excess to 0.6V ' if transistorized, if IC power amp, check cooling fan.

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My canon i 255 is not ready. it is blinking green and orange. I have reset it manualy as wel as with genarel tool available in net. It is ok for some time but it is happening again when it is off for some...


Normal 0 Normal 0 Driver could be corrupt.
Disconnect the printer or at least be sure it is turned off. I'd do both and reinstall the CD software program that came with the printer. When the software program asks you to connect the printer to the USB port, do so and it should again work properly.
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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.

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I have an audiobahn a2300hct with blown components.


IRFZ48ZPBF-ND

^ from Digikey.com are a good replacement. You need to replace all of the Z48s on the side of the amp where the ones that failed were located. Digikey will also have the resistors. There may be other problems. If you're new to repair work, read through the following page.

Basic Amplifier Repair

Let me know if you have any other questions.

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go to internet explorer type http://192.168.1.1 or path given by manufacter is required to type there. press enter, one pop up window will appear give user name and password given by manufacter in the manual.

do the necessary setting in router then save and restart it

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1 Answer

Need a lil ore help!!!


If the overcurrent of DC offset lights are not green, the amplifier probably has blown output transistors.

To eliminate other problems, disconnect all speaker wires from the speaker terminals of the amp and disconnect signal cables from the amp. If it powers up normally (all lights green), the wiring needs to be checked. If it still shuts down, the amp likely has blown output transistors.

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2 Answers

Protection Light


This is almost always caused by shorted output transistors. To eliminate other possible problems do the following.

Disconnect all speaker wires from the speaker terminals of the amp and disconnect signal cables from the amp. If it powers up, the wiring needs to be checked. If it still shuts down (goes into protection), the amp likely has blown output transistors.

Generally, an amp with blown output transistors can be repaired.

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