Soundstream XXX6500

[mike49504]

YES, Both directly connected to DP10 DP11

 

[Perry Babin]

The winding between those is the center tap for those windings. It should connect to pin 8 on the audio driver board as well as the source leg of the outputs that you located earlier. Do you read 0 ohms between those points?

 

[mike49504]

yes 0 ohms at both points.

 

[Perry Babin]

With the black meter probe on that center tap, what is the DC voltage on pins 9 and 14 of the audio driver board?

 

[mike49504]

ill have to get back to you on that since i have to finish putting the amp back together .

 

[mike49504]

From the outer legs to the middle leg of the torriod i have 0.4 ohms The middle leg is suppose to be the center tap?

 

[Perry Babin]

Measure the DC voltage on pins 8, 9 and 14 on the driver board with the black probe on that center tap.

 

[mike49504]

PIN8:0

PIN9:2.43

PIN14:2.90

 

[Perry Babin]

Are you sure that the drains on the power supply FETs for this power supply have a good square wave? Does it have a 20v+ swing (ground to at least 20v)?

 

[mike49504]

Scope set to 10us .5 volts/div

 

[Perry Babin]

Are you sure that the rectifiers are good?

I'm assuming that the probe is set to 10x and the effective scope setting is 5v/div.

 

[mike49504]

The probe was set to 1x and .5 volts div. Ill check the rectifiers right now

 

[mike49504]

METER SET TO DIODE CHECK

FMG36R BOTH OF THEM MEASURE THE SAME
1-2:0.368
1-3:OL
2-3:OL

PROBES REVERSED
1-2:OL
1-3:OL
2-3:0.374


FMG36S BOTH MEASURE THE SAME
1-2:OL
1-3:OL
2-3:0.370

Probes reversed
1-2:0.371
1-3:OL
2-3:OL

 

[Perry Babin]

I was referring to DP10 and 11.

Set the scope to DC coupling. Set the vertical amp to 5v/div and the probe to 1x. Align the trace with the center reference. Set the timebase to display 3-4 cycles. Post a photo of the waveform on the drain of one of those two FETs near the small transformer.

 

[mike49504]

Heres what i have on the drain legs of the fets. I had to set the scope to 2volts/div 2us in order to see a square wave. If i set it to 5 volts all i get is 2 lines if i set it .5 volts div the top of the wave is missing.

 

[Perry Babin]

Did you set it to DC coupling?

Did you align the trace (no signal) to the center reference line?

Set it to 5v and adjust the trigger level to lock it in.

 

[mike49504]

.5 or 5?

 

[Perry Babin]

5

 

[mike49504]

scope set to 5 volts/div and 2 us. I had a square wave for a sec then this is what i have now on the drain leg.

 

[mike49504]

I dont get this Now this is what i have on the drain leg. Scope on the same settings