Soundstream XXX6500

[Perry Babin]

Pin 9 should be 15v above pin 8. Pin 14 should be 18v above pin 8.

With no power applied, measure the resistance from the source leg of M5-9 (any one of those) to either of the windings connected to the anodes of DP10 or DP11. What's the resistance?

 

[mike49504]

I dont see any M locations.

Do you know where the regulators are on this amp so i can test them ?

 

[Perry Babin]

The regulated voltages (at least some of them) are produced by the small power supply.

On the output transistors, find the legs that are directly connected from one side of the amp to the other. The outputs that do NOT have their source legs connected to the other side of the amp are the ones you want. The source legs of these should essentially be connected to the anodes of DP10 and DP11. Do you read 0 ohms between the source of those outputs and the anodes of those diodes?

 

[mike49504]

The outputs are IRFP360's

The source leg is the middle leg?

 

[Perry Babin]

The 3rd leg is the source. Pin outs for most semiconductors can be found in their datasheets.

 

[mike49504]

on the source legs of the outputs that dont not connect to the other side of the board heres what i have.

Source leg of output to DP 10 and 11 anode side:46.6k ohms

 

[Perry Babin]

That would seem to indicate that there is another open trace. Do you see any signs of leaking capacitors?

Do you see anywhere that someone has cut through silicone (or any other fixative) with a knife?

 

[mike49504]

I see where alot of the caps have been removed and soldered back in .

I will clean up somemore of the cobble job on this amp and report back.

 

[mike49504]

Perry ,

Do you know the value of R19 ?

It sits between ZD1 and ZD2

 

[Perry Babin]

680 ohms

 

[mike49504]

Thats what i thought it was just couldnt make out the 2nd color band that well.

It measures 0.668K ohms out of circuit.

1end connects to the anode sides of DP10 DP11 the other end connects to pin 9

Way out of tolorance?

 

[Perry Babin]

It's not out of tolerance.

 

[mike49504]

DO you know what transistors go in locations QP10 QP11 ?

 

[Perry Babin]

Both are A1023s.

 

[mike49504]

Everything checks good from the anode sides of DP10,11. But im not getting My 18v or my 15 volts on the driver board pins. Should i look in the area of the small power supply?

 

[Perry Babin]

Can you find the center tap for the windings driving D10 and D11?

 

[mike49504]

they connect to the anode side?

 

[Perry Babin]

There are 2 windings that connect to D10 and D11. The CT for those windings don't connect to the diodes. If you can't find it, post a photo of that area of the board.

 

[mike49504]

Heres a pic of the board . As you notice i have stuff out of the amp right now. Trying to clean up the work that was done before i recieved the amp.

For example look at R21 in the pic to me thats no where near a good repair job to me.

 

[Perry Babin]

Do the traces from these windings go directly to DP10 and DP11?