Skar Audio RP-2000.1

[caraudioguy2100]

Does anyone have a pic of this area or a schematic ?

Or knows if the transistors are in the correct locations ?

Someone has worked in this before and amp is in protection so wanted to make sure these transistors are in correct locations

 

[Perry Babin]

The 2x transistors are near the edge of the board. See attached.

 

[caraudioguy2100]

Replaced the drivers for the outputs .

I removed the outputs .

Amp is still stuck In protection mode .

Originally the amp came in with 2 shorted outputs I removed all outputs replaced the drivers 2x 2t but the amp remains in protection .

Any ideas ?

 

[caraudioguy2100]

My mistake I misspoke in the last post .

I removed the outputs and replaced the drivers .

Amp powers up and produces +- 12 volts on opamps

Also produces +- 85 volts of rail .

The protection led is lit and never switches over to blue power led .

Any ideas what might cause this ?

 

[Perry Babin]

Do you get drive to the output gates?

 

[caraudioguy2100]

No

 

[Perry Babin]

Were you driving a signal into the amp?

Scope set to 2ms?

Do you see a drive on any of the output terminals of U3 or U4?

 

[caraudioguy2100]

U3
Pins 1 and 7 have a square wave

U4

Triangle wave on pin 7 but nothing on pin 1

 

[Perry Babin]

What signal do you have going into pin 1 of the 74hc00?

 

[caraudioguy2100]

Pin 1 of U5

Scope set to 2ms 2volts/div

 

[Perry Babin]

What's the DC voltage on pin 2 of that IC?

 

[caraudioguy2100]

0.01

 

[Perry Babin]

What's the DC voltage on pin 3 and 4 of the 494?

What is the DC voltage on all 3 terminals of Q4 (near the 494)?

 

[caraudioguy2100]

494
Pin 3:0.05
Pin 4:0.00

Q4
Collector:13.59
Base:13.35
Emitter:13.59

 

[Perry Babin]

Lift Q4.

This will disable protection so be careful.

 

[caraudioguy2100]

Lifted Q4

Blue light now protection led off

So far I see nothing wrong amp idles fine produces all correct voltages nothing heating up

 

[Perry Babin]

I think that transistor is leaky or shorted.

 

[caraudioguy2100]

Still have an issue with this amp .

If I load an output in any of these locations the amps protect light is on no blue light

Replaced Q4 and amp will power up until I try to load an output in any of these locations

 

[caraudioguy2100]

Never mind found Q11 was bad

 

[boo97boo]

what kind of mosfets are used on the power supply side?
im repairing one that two caps exploded on