A pleasant good afternoon , and a happy and prosperous new year to all in our AAC forum. Is their anyone here knowledgeable of
Crowns Xti2 2002 Series Amplifiers.
So I bought this Amp back in 2016 ( Full Compass ) it worked flawlessly untill 2024 where it went into protection mode an shut down. I tried sourcing a service manual because it is out of warranty and I am in jamaica so it would cost me too much to send
it back to the USA for repairs.
Any suggestion why it went into protection mode ?

 

Good afternoon I thank the Moderator for relocating this thread to the right place. For added information for my Xti2 ,I powered on the Amp several times within the last two weeks ( since 2024 when it initially shut down ) with it still going into protection mode and shutting off until the other day it stayed on when I turned it on.
I have since done a visual of the circuit board component side and underneath looking for any visual damage. I did not see any bulging caps or did I see any charred areas or components. Any guidance will be appreciated. I'll will be testing some of these caps out of circuit shortly

 

Hello,

Do you measure a dc voltage at the output?
Do you hear a relay click when the protection starts?

Bertus

 

The first thing to do is to disconnect all loudspeakers from the amplifier. This will avoid blowing the speakers.
Check the DC voltage at the outputs, between the RED and BLACK terminals.

 

Can you take a photo of the overall circuit board so that we can identify which model you have?
Also post a photo of the front display so that we can read what it says.

 

Hello,

Here is a service manual for the xti series, found at jabse.com.
https://www.jabse.com/

Bertus

 

Hello,

Do you measure a dc voltage at the output?
Do you hear a relay click when the protection starts?

Bertus

Okay, so the red lights are off now and the DC voltage on channel 1 is approximately 16.5 to 17 mV and channel 2 it is 36.5 to 38 mV. Thank you

 

Can you take a photo of the overall circuit board so that we can identify which model you have?
Also post a photo of the front display so that we can read what it says.

Okay thank you. On my way to work right now, it is the XTI2 2002 ,I will submit a Photo of the circuit in the morning.
If there is a format, I have a short video powering up.

 

Okay, so the red lights are off now and the DC voltage on channel 1 is approximately 16.5 to 17 mV and channel 2 it is 36.5 to 38 mV. Thank you

Those voltages are in an acceptable range. Now we have to find out what "Locked in protection mode" means.

 

Those voltages are in an acceptable range. Now we have to find out what "Locked in protection mode" means.

I have a short video I could post for you to see the Amps response when turned on.

 

Okay thank you. On my way to work right now, it is the XTI2 2002 ,I will submit a Photo of the circuit in the morning.
If there is a format, I have a short video powering up.

I have a short video I could post for you to see the Amps response when turned on.

Bellow is a link to the video of the Amp going into protection mode before it stays on now :

 

Okay thank you. On my way to work right now, it is the XTI2 2002 ,I will submit a Photo of the circuit in the morning.
If there is a format, I have a short video powering up.

 

Can you take a photo of the overall circuit board so that we can identify which model you have?
Also post a photo of the front display so that we can read what it says.

 

Those voltages are in an acceptable range. Now we have to find out what "Locked in protection mode" means.

Good afternoon, why I used the terminology "Locked in protection mode" is because each time I tried turning the Amp on it would just do the routine process then within a few seconds the red lights start flashing then it goes off. This started happening from October 2024 when I parked it. You can check the video I posted. The duration of on to off would differ over time , but now it comes back on and stays on.

 

Sorry, I have not had the time to look at your reports. I will get to them later this weekend.

 

What other component / components other than caps would force the amp to shut down ? Still sniffing around, I want to locate the fault before connecting the speaker .

 

We cannot always find the smoking gun that makes a unit not work. Instead, we have to look at functionality,
With something this complex, the first place to test is the power supply.

There are some major voltages that you have to check and confirm.
+30 V
-30 V
+15 V
-15 V
+ 3.3 V

You need to be able to navigate around the circuit board and match it up with the circuit schematics.
Then there are some protection circuitry that need to be checked.

Go to the Service Manual for higher resolution pictures.

 

Thank you for that info. My test revealed 27.33 across C216 and 27.05 across C215 ( these should be + and - 30 volts )
from U17-C LM358 + and - 15.3 from pin 8 across C197 and pin 4 across C198 and if I am correct I am reading 2.6 mV across
R336 should be 3.3 v.

 

At R336, you need to measure voltage with respect to GND.

 

At R336, you need to measure voltage with respect to GND.

Last night I tried finding a ground point at C176 as per Schematic, but it seems to be under HS13 which holds D24, is U106 [ LM75BIM-3 ] leg 4 a good option ?