Output transistor explode Lanzar opti 4000

[yoppi]

I am repairing LANZAR OPTI 4000. Why do new output transistors explode?

 

[MarioRestucci]

I am repairing LANZAR OPTI 4000. Why do new output transistors explode?

probably you have problems with totem pole drivers, or ir2113s on the driver board..

 

[yoppi]

Hello

I discovered leaky 60EPF06 diode. Can anyone tell me reference of transistors QA6 QA7?

Greetings.

 

[yoppi]

I have replaced the 60EPF06 and the amplifier generates rail voltage + 116.5v and -117.5v.
I have replaced the IRS2113S, but when reinserting the DLM4000 control card, the amplifier goes into protect ....
I remove the card, it is still in protect .... disconnect the amplifier from 14v and after about 5 minutes turn it on again without the DLM4000 ....
That could be happening?

greetings

 

[MarioRestucci]

Does the amp goes in protect mode also without driver board?
Are all output fets good and genuine (irfp360lc)?

 

[yoppi]

Does the amp goes in protect mode also without driver board?
Are all output fets good and genuine (irfp360lc)?

Hello
It has output transistors (irfp360) removed. It is in protection without the output drive board for 5 minutes. Then it turn on normally...

 

[MarioRestucci]

Hello
It has output transistors (irfp360) removed. It is in protection without the output drive board for 5 minutes. Then it turn on normally...

Very strange! You need heard a more expert person opinion! Sorry! 😱