Question about Jensen XA2150 Car Audio Amplifier

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Speaker output is suddenly much lower and distorted. protect light comes on brightly and then dims at which point the sound comes on .

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1 Answer

My lenovo ideapad is showing that the brightness is all the way up, but it is really dim


If it is new, I would get it replaced as it sounds like the back light is failing.

Feb 15, 2014 | Lenovo IdeaPad Computers & Internet

1 Answer

No sound coming with protection light on


It's either overheated or you may have faulty speaker wiring or a shorted speaker. These directions come from a Samson servo 120a but the theory is the same.

The following conditions will cause the Protection LED to go on:

Initial power-up: For approximately five seconds after initial power-up, the relay

speaker connection circuitry is deactivated and the speaker output is muted. If everything is operating normally, you will hear an audible click at the conclusion of this brief period, as the circuitry is activated and the Servo 120a begins delivering signal to connected speakers (at which point the Speaker LED will light if the Speaker on/off switch is in its "in" position). It is normal for the Protection LED to fade gradually after the amplifier is powered off.

Overheating: A temperature sensing device in the Servo 120a will cause the relay speaker connection circuitry to be activated (and the Protection LED to go on) whenever the operating temperature of the unit rises above a safe level. To guard against this problem, make sure the Servo 120a receives adequate ventilation on all sides ; in extreme environmental conditions, you may also

want to consider the use of cooling fans.

Severe overcurrent conditions: This occurs whenever the signal being output

from the Servo 120a rises to a level above 20% THD (Total Harmonic Distortion).

Shorted speaker cables: This will occur if, due to faulty wiring, the hot and ground signals being output by the Servo 120a short to one another.

Output impedance drops below 2 ohms: This can occur if the Servo 120a is connected to inappropriate speaker systems (see the "Setting Up and Using the Servo 120a" section in this manual for more information).

DC voltage detected at speaker output: The most likely cause of this is an internal failure. In general, any time the Protection LED lights up (other than during the approximately five seconds following initial power-up), there is reason to be concerned. If this occurs, turn the Servo 120a off immediately and carefully check all wiring and external devices in order to locate and correct the condition that caused the LED to light up in the first place.

Dec 27, 2010 | Samson Servo 170 Amplifier

2 Answers

MY KICKER ZX 750.1channel amp "FLIP FLOPS" from protected mode(red light) to normal (green light) every 2 seconds.


Are you getting any sound output at all from amplifier?
Is there a popping or banging coming from speaker?
It could possibly be a faulty output mosfet that is ocillating cause DC to leak onto the speaker output causing it to flip into protect.
please advise
thanks,ben

Sep 27, 2010 | Kicker (ZX750.1) Car Audio Amplifier

1 Answer

Distorted sound.


You can try shutting off Audio Hardware Acceleration.

Start > Control Panel > Sounds and Audio Devices > Advanced (Under Speaker Settings) > Performance.

Let us know
Good Luck

Apr 14, 2009 | Audio Players & Recorders

1 Answer

Lack of power, or bad amp?


Check your ground. Its just as important as the power supply. Take off any paint, good ground means good power, check the fuse on the amp and any connctions to the battery other than that i would exchange it

Feb 10, 2009 | Infinity 475A Car Audio Amplifier

1 Answer

Fuzzy sound from right front speaker output


The main issue is to determine where the distortion is coming from. Does it start in the front and and get amplified or does it appear in the output section only? This will require a fixed signal and an oscilloscope to trace. Check for leaky coupling caps or leaky transistors in at the diff-amp section.

Dan

Feb 02, 2009 | Sony STR-DE485 Receiver

1 Answer

Coustic 601se power on but bad sound


This is generally caused when there are blown output transistors but that generally causes the fuse to blow or causes the amp to go into protect mode.

If you connect a 15 amp fuse in series with the main power wire and it blows when remote voltage is applied, the amp is drawing excessive current. The problem could be either in the power supply or audio circuits.

Do NOT apply power without having the transistors clamped TIGHTLY to the heatsink. They can fail in seconds when there is a problem. The heatsink helps protect them.

The following page may be helpful when troubleshooting.

Amplifier Repair Primer

Let me know if you have any other questions.

Aug 23, 2008 | Coustic Car Audio 601SE Car Audio...

1 Answer

California 3600 mosfet discrete 3 ch amplifier 600 watts does not work


It sounds like it's going into protect. To be sure it's not the wiring, disconnect all speaker wires from it. If the light still goes out, check the DC voltage on the B+ and remote terminals. Place the black meter lead on the ground terminal of the amplifier. If the voltage remains above 11 volts as the amp tries to power up, the output transistors are almost certainly shorted causing the amp to go into protect.

Nov 25, 2007 | Profile 600MSX Car Audio Amplifier

1 Answer

Green LED comes on then fades out


This is common when the output transistors have failed. The amp powers up and the amp senses a problem and goes into protection mode. Generally, there is a protection LED but not all amps have them. To be sure that the problem is not installation related, check the DC voltage across B+ and ground when the amp tries to power up. If the voltage remains above 11 volts, the problem is almost certainly due to a failed component in the amplifier. Disconnect the signal lines and all speakers (disconnect the wires from the amp terminals) and try to power it up. If it powers up, you could have a defective speaker or defective wiring. If the amp still fails to power up, the amp should be checked by a qualified tech.

Sep 10, 2007 | Crossfire VR402 Car Audio Amplifier

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