Stetsom EX10500EQ

[caraudioguy2100]

Amp came in with blown outputs I replaced the outputs and driver IC since only 1 bank of outputs were bad .

Amp powers up and produces regulated voltages also produces rail voltage measured at the rectifiers.

I get no audio at all .

Any ideas ?

 

[caraudioguy2100]

On this amp I bet 240 volts of rail on only half of the outputs .

The other half of the outputs have 0 volts on them .

Is this normal for these amps does anyone know ?

 

[Perry Babin]

It's common for some of the Brazilian amps to be H-bridge and if that's the case with this amp, 0 and 240 is normal. When the amp is in operation, it will have 120v on both speaker terminals.

Does this amp have a blink code for the LED?

 

[barber02]

Also check that you have + and - 15 volts on your op-amps in the preamp section.

 

[caraudioguy2100]

I have regulated voltages on the opamps .

These amps use IR2110 driver ic’s on 1 ic I get 4 volts on pins 1 and the other ic I get 0 volts on pin 1 wondering if this is normal or I have a problem somewhere ?

The map had shorted outputs and I changed them out with original part numbers and switched out the driver ic on the bank of outputs that failed the other ic is still original .

Amp powers up and idles fine produces regulated and rail voltages but I get no audio at all

 

[Perry Babin]

Is it straight DC or is it a square wave that reads 4v with a multimeter?

 

[caraudioguy2100]

I measured it with a multimeter and the voltage was at 4 volts never looked at it with a scope

 

[Hexhclass]

Do you have oscillation on the outputs?


Currently am working on a 5k with no audio but mine is missing the high side signals.

 

[caraudioguy2100]

Perry it’s straight DC on pin 1 of the driver IC’S (IR2110)

 

[Perry Babin]

Compare the resistance from terminal 1-2 and 1-3 for the two ICs. Are they very nearly identical?

 

[caraudioguy2100]

No

The new IC measures

Pin 1-2:21.89K
Pin 1-3:22.28K

The other IC that’s in Question

Pin 1-2:334 ohms
Pin 1-3:107 ohms

 

[Perry Babin]

K ohms is normal. ohms is not. Change the IC in question.

 

[caraudioguy2100]

Replaced the driver ic and it took care of the voltage issue .

Now the issue is the MC14011 IC the voltages don’t match on those either .

 

[caraudioguy2100]

Does anyone know what diodes are being used in the output section ?

1 side of the diode connects to the gate leg of the output other side connects to the driver ic

 

[caraudioguy2100]

Can anyone tell me if these are switching diodes or regular diodes?

They connect between the LO pin of the IR25607S driver IC and the gate leg of the outputs IRFP4868.

The other diode connects between the HO pin of the driver IC to the gate leg Of the other outputs .

So they are being used for the high and low side drive .