Amp going into protect mode - Samson Music

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.

I have same issue anyone have any ideas?

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.

Dan

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!

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

Dan

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.

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.

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.

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.

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.