Audison LRX5 600 No Sound

[Frycztech]

Aren't you looking for the gate resistors?

Yes

 

[Perry Babin]

Why are you concerned with the dimensions? Use your multimeter to find all resistors connected to the gates of the FETs.

Then find which of those connect to the driver transistors and which of those connect to ground.

 

[Frycztech]

It looks like that from the left pin they go the the resistors with the 222 on them.

 

[Perry Babin]

Are you saying that none of the gate legs (left leg) of the PS FETs are connected to any terminals of any of the 47 ohm resistors in that area? Check all possible combinations.

 

[Frycztech]

It looks like they go from the Fets to the 222 resistor then to a large part on the printed board meeting all the right pins. Would that be correct?

 

[Perry Babin]

Are the 222 resistors connected to ground.

Did you check for continuity from all gate terminals to both terminals of all of the 470 resistors?

 

[Frycztech]

The gate terminal goes to the 222 resistors then i believe it goes to the ground terminal. The 470 resistors have continuity to the right pin of the rectifiers to the left of the FET'S. Dose that make sense?

 

[Perry Babin]

The 222s going to ground makes sense.

One end of the 470 resistors going to the gate legs of the PS FETs makes sense.

The other terminal of the 470 resistors going to the rectifiers makes no sense.

 

[Frycztech]

The 470 dont go to any legs of the fets I have no continuity to them.

I have it to the right pin of the rectifiers.

Dose the make the 2.2k the gate resistors that go to ground ?

 

[Perry Babin]

What's the resistance between the emitters of the drivers and the gate legs of the FET?

I don't understand the question.

 

[Frycztech]

The drivers for the output section of the amplifier or the drivers are also the rectifiers? I beliver the drivers would be the A1695's?

 

[Perry Babin]

The drivers between the power supply driver IC output terminals and the gates of the FETs.

 

[Frycztech]

I see the gates (Left pin) Going to the 2.2k resistors then the other side of that resistor appears to be going to a large are on the board where they all meat and I believe it goes the the ground terminal. Should the gates be going somewhere else?

 

[twilliar]

That 2.2k resistors job would be to pull the gate back to ground during the "off" part of the drive signal.
There should be another resistor of a much lower value also going to the gate that is coming from the drive buffer transistors.
I see 3 4.7 ohm resistors grouped by the Q9, Q10, Q11 group that may be the gate drive resistors.

 

[Frycztech]

Ok I see the 4.7 only on that one side and I dont have any continuity to them. I do have continuity to R26, R30 and they are labeled as 4R7 could these he the other gate resistors?

 

[Perry Babin]

Are they connected between the driver transistors and the gate legs of the PS FETs?

 

[Frycztech]

Yes I believe they are. Do I need to replace the 2.2k as well as the 4.7? What would the wattage of them be?

 

[Perry Babin]

Measure the resistors with a dial caliper and order the same size.

The applied voltage couldn't have been more than about 12v. It's unlikely that that voltage would burn a 2.2k resistor. Check them to confirm.