It's unlikely that the current is passing through the regulators but, to eliminate it as a problem, desolder one of each color wire that's feeding the regulators.
Not sure if this has anything to do with my problem or not.
I pulled all of the fets out and tested the gate signals and they all look perfect. As soon as i put some fets in the signal goes to crap again.
I pulled all of the fets out and tested the gate signals and they all look perfect. As soon as i put some fets in the signal goes to crap again.
Im using the STP75NF75's from Future electronics.
The orginals had that crazy number or symbol after the STP75NF75
The orginals had that crazy number or symbol after the STP75NF75
Does it draw excessive current with FETs in only one power supply?
Does it draw excessive current with only 1 FET per bank?
Does it draw excessive current with only 1 FET per bank?
With 1 fet per bank total of 2 fets (1 per side) amp idles perfectly and idles at 1-2 amps.
If i put all 6 fets in 1 supply amp idles perfectly around 1-2 amps
If i put all 6 fets in 1 supply amp idles perfectly around 1-2 amps
I put 6 fets in 1 supply powerd up the amp and it was at 1 to 2 amps of current draw at idle all gate signals looked great. I pulled the fets out of that supply and put fets in the other supply amp powerd up and same thing all gate signals looked great and amp was at 1 to 2 amps of current .
Did you pull the wires feeding the regulators? No need to do so if you haven't.
In the supply without FETs, install only two. Install the ones on each end of the row. Does it still power up normally?
In the supply without FETs, install only two. Install the ones on each end of the row. Does it still power up normally?
Never pulled the wires The &815 was defective though.
If i have all 6 fets in 1 supply and 2 fets in the other supply 1 at each end amp powers up and idle's perfectly But the regulators get red hot within a sec
If i have all 6 fets in 1 supply and 2 fets in the other supply 1 at each end amp powers up and idle's perfectly But the regulators get red hot within a sec
Install the rest of the power supply FETs 2 at a time to see if it starts to draw excessive current again.
I installed the rest of the power supply fets and amp idles perfect.
Now i have to resolder the diodes back in to see if it remains the same.
Now i have to resolder the diodes back in to see if it remains the same.
well started with soldering in 2 diodes out of the 8 and it drew excessive current again and the fets finally bkew, So now i have to order some new fets again,
Should i stick with the same fets or try something else?
Should i stick with the same fets or try something else?
Do you have any 3205s?
I think the FETs you ordered should work but you'll have to decide whether you want to try them again.
Did you try soldering the rectifiers back in before you started soldering the orange diodes back in?
I think the FETs you ordered should work but you'll have to decide whether you want to try them again.
Did you try soldering the rectifiers back in before you started soldering the orange diodes back in?
I soldered the new rectifiers back in before i started soldering the diodes back in.
I have alot of 3205's in stock Should i try swapping them out to the 3205's?
I have alot of 3205's in stock Should i try swapping them out to the 3205's?
Yes. I don't think there was anything wrong with the other transistors but using the 3205s would allow you to continue troubleshooting. Desolder the diode that you last soldered in. Get the amp to power up normally and twist the transformers to see if the amp starts to draw excessive current again. If not, see if the amp will produce audio. Don't worry about soldering the small diodes back in again until you determine if there are any other problems.
Back to this amp.
I have the current issue taken care of.
When it was playing for a sec the amp went into protection mode . I pulled all of the outputs drivers driver board and it was still stuck in protection.
I removed the rectifiers and amps powers up and idles perfect so something in the output section is defective.
Between legs 2 and 3 on the 7815 it shows 0.04 ohms i lifted the 7815 and between the pads i have 0.04 ohms is this normal?
I have the current issue taken care of.
When it was playing for a sec the amp went into protection mode . I pulled all of the outputs drivers driver board and it was still stuck in protection.
I removed the rectifiers and amps powers up and idles perfect so something in the output section is defective.
Between legs 2 and 3 on the 7815 it shows 0.04 ohms i lifted the 7815 and between the pads i have 0.04 ohms is this normal?
Ok found the prolem the diode was shorted.
I have to solder alot of stuff back in now .
Next question is On the output driver board is there a common problem that is wrong with them . As soon as i stick that back in the amp goes into protection mode
I have to solder alot of stuff back in now .
Next question is On the output driver board is there a common problem that is wrong with them . As soon as i stick that back in the amp goes into protection mode
Yes. There are two transistors in the center of the driver board (marked 1D) that fail. If you look closely, you'll probably see that they've turned brown and the board around them shows signs of overheating.
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