Boss Audio REV 3000 in protect

[Perry Babin]

Remove the driver transistors and check them. Do not apply power to the amp with the drivers out of the circuit.

 

[bigpun4fubu]

where are those on here? the driver transistors

 

[bigpun4fubu]

would these be the driver transistors?

 

[Perry Babin]

I have nothing on this amp. Did you follow the traces?

Do the gate resistors connect directly to leg 1 of those transistors?

 

[bigpun4fubu]

ok ill check that

 

[bigpun4fubu]

i believe they are all good

 

[Perry Babin]

Yes. They look OK.

When you had the drivers in and the rectifiers out, did it blow the fuse before you applied remote voltage (only B+ and ground connected)?

 

[bigpun4fubu]

no didnt blow fuse til remote voltage was applied

 

[Perry Babin]

Do you read ~0 ohms between the first leg of the drivers to the gate resistors?

Check both sets of drivers to both sets of gate resistors.

 

[bigpun4fubu]

yes I read 0 ohms from first leg of drivers to all 10 gate resistors 2 transistors for each bank

 

[Perry Babin]

Do you have a current limiter for the B+ line?

 

[bigpun4fubu]

as in a big resistor? i have some 1 ohm 20 watt resistors

 

[Perry Babin]

Reinstall of the drivers. Leave the rectifiers out.

Wire two of them in series and insert them in the B+ line between your power supply and the amp.

Power up the amp and watch the current draw from the 12v power supply. Twist the transformer to see if it makes the current draw vary.

 

[bigpun4fubu]

no variation in current draw

 

[bigpun4fubu]

and my mistake it does blow fuse before remote is connected when current limiter is not in line on B+

 

[Perry Babin]

What's the resistance measured directly across the B+ and ground terminals (no power wires connected)?

 

[bigpun4fubu]

32.3 ohms

 

[Perry Babin]

32 ohms is low but not enough to blow a fuse.

With the current limiter inline and the amp powered up (including remote), what is the current draw?

With the limiter inline, what is the DC voltage on the gate leg of each of the power supply FETs?

Does the current draw change when you probe each of the gate legs when measuring the voltage?

 

[bigpun4fubu]

ok we have a question when hooking up current limiter which is 10 ohms because the 2 one ohm resistors i have are 10w and not 20w , all i could find to add to it was an 8 ohm 20 watt so we added it to the 2 and when we check voltage across power supply we get 13.9VDC but when connected to the B+ on amplifier we get 2.0vdc across B+ and negative

 

[Perry Babin]

10 ohms is too much. Did you measure 10 ohms? You can't get 10 ohms from connecting two 1 ohm resistors.