This amp had shorted outputs on 1 side of the amp..
I replaced the outputs and when trying to power the amp up it draws excessive current..
I flipped the audio driverboards around thinking 1 is defective but amp still draws excessive current..
If i put outputs in 1 side of the amp and power it up with both driverboards in place amp powers up and idles fine..
If i start putting outputs on the other side of the amp 1 by 1 it will draw excessive current doesnt matter which location i put them in..
does the board with the F16 and B52 IC's have anything to do with the drive signal??
Or do you have any ideas on what to check??
I replaced the outputs and when trying to power the amp up it draws excessive current..
I flipped the audio driverboards around thinking 1 is defective but amp still draws excessive current..
If i put outputs in 1 side of the amp and power it up with both driverboards in place amp powers up and idles fine..
If i start putting outputs on the other side of the amp 1 by 1 it will draw excessive current doesnt matter which location i put them in..
does the board with the F16 and B52 IC's have anything to do with the drive signal??
Or do you have any ideas on what to check??
For the 3-pin connector, 1 should be ground and the other two should connect to pins 9 and 11 of the B52 IC. Confirm that this is true for that board.
Reinstall this board and remove the driver boards. Post the DC voltage on pins 9 and 11 of the B52 IC.
They should not both be positive. If they are both positive and pin 9 has approximately -2v, replace the IC (LM361).
What changed from the previous readings?
Do you have full rail voltage on the center leg of all of the installed outputs?
Do you have full rail voltage on the center leg of all of the installed outputs?
I must have been not touching the pins good enough or reading the wrong pins from the last post..
I will power the amp up and check the voltages on the outputs
I will power the amp up and check the voltages on the outputs
I get 0.00 volts on all center legs of the outputs..
On the FB31N20D's i get -59.6 volts on legs 1 and 3 on all of them
On the IRF9640's i get 59.6 volts on legs 1 and 3 on all of them
On the FB31N20D's i get -59.6 volts on legs 1 and 3 on all of them
On the IRF9640's i get 59.6 volts on legs 1 and 3 on all of them
Solder a bridge between legs 13 and 14 of the TL074 on that board. Do you get a square wave out of pins 9 and 11 of the B52 IC?
I dont get this amp All drivers test fine on both boards..
It doesnt matter what driverboard i put in which location..
If i put 1 output fet in at a time in theese locations the amp will draw current and blow the outputs..
Any ideas what to check ?
I know i have to clean the pads up yet for the outputs i checked for solder bridges found nothing ..
It doesnt matter what driverboard i put in which location..
If i put 1 output fet in at a time in theese locations the amp will draw current and blow the outputs..
Any ideas what to check ?
I know i have to clean the pads up yet for the outputs i checked for solder bridges found nothing ..
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