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Why does it keep going into protection mode?

There are several circuits that can prevent start up, not the least of which is the power supply itself. Check the owners manual, it may tell you about conditions that could cause this. The next step is to open it up. There may be something obviously wrong, burnt, disconnected or stressed. Barring that, we'd be into board and component level testing. If you know what your doing, the output stages of these high power amps are a good place to start.

Mar 01, 2016 | QSC RMX 5050 5,000 Watt Power Amp

2 Answers

It plays for about 30 minutes and then just stops, as if overheating. After a cooldown period, it starts up again for another short period. Suggestions? Any recommended vents I could cut in...

The small Fender products often have a TDA2050 power chip in them. The chip is on a thin aluminum heatsink and is intended for light use. If you try to sound like a bass guitar amp with this, the chip will go into thermal protection mode. Cutting vents will not help very much, and pushing it to these levels will destroy the speaker eventually. If you need more power, buy a bigger amp. This one would be suitable for a 10 foot by 10 foot room.

May 24, 2011 | Fender Musical Instruments Corporation...

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Upon power up channel 2 will stay in protect. no audio from ch 2. This amp is only 30 days old and only 3 shows under its belt. Very discouraged....

The output section of this unit appears to have a problem. That channel is in protect mode and will not produce sound. At this point, you should return this for a warranty repair. While relatively rare, this can happen with new equipment. As long as you have not overdriven the amp, the warranty should take care of the problem.

Keep us posted on how you make out.


Apr 11, 2011 | Gemini Sound Products GEMINI XP 6000 6000...

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When I turn on the amp the indicator lights comw on and seem ok for 3 or 4 secs and then there is a click and the amp lights go out even though power is still showing as on.

Sounds like the amp is going into a protective mode.
Make sure your outputs aren't shorted.
If you're into electronics, look for bulging electrolytic capacitors or blown transistors.
Something is tripping the safety in the unit!

Mar 01, 2011 | Samson Xm910 8Channel Powered Mixer...

1 Answer

Amp goes into protect mode as soon as switch is turned on. Pasport 250

There is a problem with the internal amp itself. These are extremely difficult to access. Contact Fender for a local authorized service center.


Mar 11, 2010 | Fender Passport Deluxe 500watt Sound...

1 Answer

When I turn the volume up past 3 it starts this

I suspect you are going into protect mode which backs the gain way off to prevent over driving.

You MAY be trying to get too much volume out of it. Remember that the value of "3" on the volume means ALMOST nothing as you may have a hotter guitar. Some guitars with internal preamps EASILY overdrive the amps at low settings. Do not use excessive gain at the input.

If the amp is real low volume way below what is needed to play, then there may be a problem with the protection/compressor circuit.

Suggestion: Take your guitar to a music store and compare action on an IDENTICAL amp.

Feb 01, 2010 | Music

1 Answer

My boss amp is on protection mode and it wont work its a 3500 watt chaos idk what is wrong with it

Likely one of the power amps has failed component(s) and does not achieve electrical balance which then goes to protect mode to prevent damaging your speakers.

You will need to have it serviced.

Dec 25, 2009 | BOSS AUDIO SYSTEMS Music

1 Answer

Crown XLS402 amplifier will not work

It is probablly in protect mode due to a failure. This prevents blowing your speakers.

You will need to have or do servicing on it. First verify that you can unplug ALL INPUTS and that speakers are connected and problem of the protect LED exists. A bad input MIGHT be causing this due to a ground loop.

Make sure NONE of your speaker leads are grounded or shorted.

Nov 07, 2009 | Crown-Audio XLS 402D Amplif 300 with 8o...

2 Answers

MY Fender Passport P250 went into protect mode. I changed the FUSE at the power supply with a new fuse. Still it is in Protect mode. How to fix this

This needs to go to the repair shop. The protect mode is turned on when either the power supply has a problem or one or both power amplifiers have a problem. These are often blown components.

These units are HARD to work on. To open you have to first remove then front panel before you can remove the back panel that has the power supply and power amps/heat sinks.

Compare repairs of these units to working under an automobile dashboard!

Hint: On startup, use a series 150 wat lamp to limit current while repairing. SInce these use a switching supply operating off the input line, use an isolation transformer for personal safety.

Oct 04, 2009 | Fender Passport Deluxe 500watt Sound...

1 Answer

My Fender Passport stays in protect mode.

I have one that has done the same. It is the next smaller size. The power supply fried a toroidal inductor in mine. Frankly, these things are a major pain to work on. You have to usually remove the front panel before you can remove the back power supply and power amp section.

If you have warranty coverage USE IT !!!

The protect feature in mine monitors the power supply load and shuts down the supply if it senses overload. They are hard to work on as you have to bypass the protect to troubleshoot and get to the root cause.

Use the old light bulb in series trick to limit the current.

Sep 23, 2009 | Fender Passport Deluxe 500watt Sound...

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