ATG 6500.1D

[caraudioguy2100]

Only 1 output gets to hot to touch in under a min

Any ideas what might this ?

 

[Perry Babin]

Defective gate resistor or diode for that FET?

 

[caraudioguy2100]

Checked them and they both test fine also pulled the output out and checked that as well and it measures fine .

I have new outputs I can try installing 4 on that side and see if that makes a difference

 

[Perry Babin]

Just because it checks OK, that doesn't mean that it can't cause a problem. If it has a lower threshold than the other parallel FETs, it would run hotter at idle.

 

[caraudioguy2100]

Replaced the outputs and now they all get warm and continue heating up equally within 1 min

 

[Perry Babin]

Do the solder connections on the back of the driver board look like they have run hot?

Did you use exact replacements?

 

[caraudioguy2100]

I used exact replacements

And here is a picture of the back of the driverboard

 

[caraudioguy2100]

Not sure why they moved my post to this thread I have 2 amps same model number with 2 differ you issues now they combined both amps into 1 post and now it’s confusing

 

[Perry Babin]

It's not nearly as bad as usual. I'd desolder/rersolder the MPSA42s near the header. It's best to use additional liquid flux to make the solder flow through the board to the top.

I mostly saw 31N20s in this type amp. Were they the originals or were they the part marked on the board?

 

[Perry Babin]

My mistake.

Click the red/white triangle and get the mod to fix it.

 

[caraudioguy2100]

I used the originals as marked on the board

 

[caraudioguy2100]

Default ATG 6500.1D
This is amp number 2

This one doesn’t power up

Here is what I get on the 3525

Pin 1:0.00
Pin 2:5.01
Pin 3:0.00
Pin 4:0.14
Pin 5:2.09
Pin 6:3.60
Pin 7:2.07
Pin 8:0.29
Pin 9:5.47
Pin 10:0.00
Pin 11:0.00
Pin 12:0.00
Pin 13:13.47
Pin 14:0:00
Pin 15:13.47
Pin 16:5.01

This is a SG3525 not a 494 so I should not have 12 volts on pins 8,11,13 correct ?

 

[Perry Babin]

The heating may be normal. They may simply have the CCS set higher to possibly reduce distortion.

When clamped, with the amp drive a load to the rails symmetrically?

Did you ask a mod to fix the threads?

 

[caraudioguy2100]

Yes I asked them to fix the thread

 

[AllenB]

caraudioguy, please list the post numbers and a name for the new thread and I will fix it.

 

[caraudioguy2100]

Thread title ATG 6500.1D

And posts 6,8,10 need to be moved to a new thread

 

[AllenB]

Sorry caraudioguy, same title and thread starter confuses not only the members but us mere mods too 😱

I've made the other title different, but PM me if it's not satisfactory.