Power Acoustic PS2-2200

[mike49504]

I got this amp with blown power supply fets -FQP50N06 i replaced them with IRFZ44's..


When powering up the outputs will get red hot only on 1 side of the amp..

I removved them they all tested fine.. So i took the drivers for the outputs out and they also tested fine...


I replaced the drivers for the outputs just incase they were defective and were testing fine..


The orginal drivers are B647 and D667

I replaced the D667 with a C3228 and the B647 with a A1275..


Power the amp up and they still get red hot...

Any ideas ?

[timwebb]

are the gate resistors good? any solder bridges any where?

[mike49504]

AlL gate resistors are good and no solder bridges anywhere

[timwebb]

hows the signal look on the gate resistor?

[Perry Babin]

Can you post a photo of the board?

[mike49504]

Heres a couple photos let me know if u need more

[Perry Babin]

Which outputs are getting hot Q...?

I see 2 are missing, were they defective?

[mike49504]

No they are fine i took all of them out on that side for testing and only stuck 2 of each back in..


The Tip36's are getting red hot if i take the 36's out and leave the 35's in circuit the amp will power up and idle fine..

[Perry Babin]

Circuit board designation please.

[mike49504]

Q115 Q114 Q118