DS18 A5k4

[imraneesa]

Hi all,
Anybody has the schematics for this kind amp. Going into protection for no reason. Disabling the protection amp coming and playing normal. Shorting the optocoupler 3 and 4 pins makes the amp on. Thank you

 

[Perry Babin]

DCV across pins 3 and 4 of the optocoupler?

 

[imraneesa]

0.6v

 

[Perry Babin]

That's 3-4?

 

[imraneesa]

Yes as soon I on the amp voltage goes to about 13v and comes and settles at 0.6v while amp is in protect.

 

[Perry Babin]

Are you doing 2 thing to make it play? Disabling the protection and shorting 3-4?

 

[imraneesa]

No, one time at a time I did. Removing the pnp transistor amp came on and play. After I put back pnp transistor and amp gone in protect. Then I just tried to short 3 and 4 and the amp came on.

 

[Perry Babin]

When in protect, was the power supply in operation.

If you have the tutorial, do any of the examples under item 33 on the Switching Power Supply Troubleshooting page look familiar?

I don't have a diagram for this amp, I'm trying to find something similar.

 

[imraneesa]

when the amp is in protect, power supply is not in operation. i am looking into the examples if i find i will let you know.

 

[imraneesa]

Hello Sir,

I did not find any similar example.