Razor RZR1-2500D

[joselorenzo]

Hello, I'm trying to repair an Acustik power amplifier.
Model RZR1-2500D
The problem is that when the volume is increased beyond a certain level of sound demand, it intermittently goes into protection mode.
I have no idea what causes this type of failure.
HFP50n06
FDP2552
The amplifier has integrated circuits such as
SG3525AP
LM393
IRS2092s
Can someone help me with how to address this problem? Please.
Thanks for you attention

 

[Perry Babin]

Are the output FETs the exact original part number?

From a reputable distributor?

 

[joselorenzo]

The amplifier has no repairs, its original parts can be seen

 

[Perry Babin]

Will it shut down when driven to clipping with no load?

What about with a load significantly higher than its lowest rated load?

Could it be due to voltage drop at the 12v input (low voltage protection)?

 

[joselorenzo]

Will it shut down when driven to clipping with no load?

with and without load. causes the fault

What about with a load significantly higher than its lowest rated load?

The fault persists

Could it be due to voltage drop at the 12v input (low voltage protection)?

The voltage variation is from 13.79v to 13.62v with a consumption of 18amp with a load of 2 ohms in audio output a tone of 60hz

 

[Perry Babin]

Was the amp working perfectly for a while and this started after it had been OK?

 

[joselorenzo]

Was the amp working perfectly for a while and this started after it had been OK?

Just like that, the daily use amplifier started to give that problem.

 

[Perry Babin]

You stated that it intermittently goes into protection. Does that mean that it sometimes plays normally?

Does it play normally at low levels?

 

[joselorenzo]

You stated that it intermittently goes into protection. Does that mean that it sometimes plays normally?

At low to medium volume it works normally.

Does it play normally at low levels?

At that volume low level, it works correctly.

Edit:
I just realized that without any load on the audio output, it also goes in and out of protection mode.

 

[Perry Babin]

Does it seem to be drawing more current as you increase the volume with no load?

 

[joselorenzo]

Does it seem to be drawing more current as you increase the volume with no load?

Without load and with the gain control at minimum, there is a consumption of 1.0 amps.
Without load and with the gain control at 3/4, there is a consumption of 1.1 amps when entering and exiting protection mode.

 

[Perry Babin]

Drive a test tone (50-100Hz) into it and measure the ACV across the speaker temrinals when id goes into protect. Do this with a load and again without a load.

What's the voltage where is shuts down for each?