Directed 650

[mike49504]

I have this amp in for repair.

When powering it up it draws excessive current . So i checked the outputs and found 1 to be shorted.

I replaced the outputs and tryed powering it up same thing . So i replaced the drivers in the amp.

Same thing it will draw excessive current. If i remove 4 of the outputs that get warm when trying to power it up the amp will come on and idle perfect.

The outputs test fine.

Any ideas?

 

[Perry Babin]

If no one else can help, post a photo so I can see what the internals look like.

 

[DcMaN]

I just had the same issue with the directed D800, i replaced all the IRFZ44, both irf540, and both IRF9540, and the amp was back to normal.

 

[mike49504]

Ill get pics up in a lil bit .

I removed the 2 outputs that get warm the amp will power up then.

Heres the reading i get on the outputs In diode check.


Tip36C
1-2:0.536
1-3:0.539
2-3:OL

Reverse probes
1-2:OL
1-3:OL
2-3:OL

Tip35C
1-2:OL
1-3:OL
2-3:OL

Reverse probes

1-2:0.536
1-3:0.538
2-3:OL

To me it appears the outputs are good.

 

[DcMaN]

I also replaced both rectifiers D55/D56 near the large capacitors i believe they are a FMG22S , and a FMG22R

 

[mike49504]

I think i found the problem with this amp.

Someone worked on it before and had the wrong drivers in the amp and also had a tip 35c in a 36c's spot.

I will update you when i switch the stuff around

 

[mike49504]

That was it.

Switched the output to the right one and switched the drivers that were wrong and amp is powerd up and playing perfect.