There is a 1N5819 diode connected to pin 8 of the 3525. Desolder it to take it out of the circuit. Does that allow pin 8 to charge?
I found the problem after looking at both boards over and over again someone put one of the rail caps in backwards after an attempted repair
Replaced the cap and put rectifiers back in the amp .
Same issue amp stuck in protection mode
I noticed I have 55 ohms between gate and source on the output pads for the amp .
The other amp reads OL
Also I noticed 0.04 ohms between pads 3 and 4 of the audio driverboard even tho it’s not in circuit .
Other amp reads OL
Any ideas ?
Same issue amp stuck in protection mode
I noticed I have 55 ohms between gate and source on the output pads for the amp .
The other amp reads OL
Also I noticed 0.04 ohms between pads 3 and 4 of the audio driverboard even tho it’s not in circuit .
Other amp reads OL
Any ideas ?
Post the DC voltage on all of the terminals of the driver board of the working amp. Post the voltages in this thread.
I went to grab the voltages made sure not to slip between pins and got the voltage on pin 2 and the amp is now stuck in protection mode
Pin 1:0.00
Pin 2:92.1
Pin 3:0.00
Pin 4:0.00
Pin 5.0.00
Pin 6:15.1
Pin 7:-15.0
Pin 8:0.00
Pin 9:0.00
Pin 10:0.00
Pin 11:-72.3
Pin 12:-61.3
Pin 2:92.1
Pin 3:0.00
Pin 4:0.00
Pin 5.0.00
Pin 6:15.1
Pin 7:-15.0
Pin 8:0.00
Pin 9:0.00
Pin 10:0.00
Pin 11:-72.3
Pin 12:-61.3
What multimeter are you using?
What mode is it set to?
Which terminal reads 0 ohms to the positive speaker terminal?
What mode is it set to?
Which terminal reads 0 ohms to the positive speaker terminal?
I’m using a Klein tools MM600
It’s set to DC voltage
Terminals 3 and 4 measure 0.03 ohms to positive speaker terminal
Is there a way to bypass the protection in this amp ?
The amp will only power up with the rectifiers removed and I’ve pretty much checked everything
It’s set to DC voltage
Terminals 3 and 4 measure 0.03 ohms to positive speaker terminal
Is there a way to bypass the protection in this amp ?
The amp will only power up with the rectifiers removed and I’ve pretty much checked everything
0.734k ohms
And I removed the diode in post 21 and it doesn’t make any difference pin 8 is still at 0.30 volts until I remove the rectifiers .
Once the rectifiers are removed pin 8 is at 5 volts
And I removed the diode in post 21 and it doesn’t make any difference pin 8 is still at 0.30 volts until I remove the rectifiers .
Once the rectifiers are removed pin 8 is at 5 volts
It appears D21 is the only other thing connected to that trace .
I know when the output blew in that other amp that was working pin 8 only had 0.30 volts on it as well until I removed the defective output .
I removed the diode connected to pin 8 in this amp same thing pin 8 will not charge
I know when the output blew in that other amp that was working pin 8 only had 0.30 volts on it as well until I removed the defective output .
I removed the diode connected to pin 8 in this amp same thing pin 8 will not charge
Do you have a socket and another 3525?
If so, install them but leave pin 8's leg out of the socket.
If so, install them but leave pin 8's leg out of the socket.
The only way the amp will power up is if the rectifiers are removed and pin 8 is in the board .
If I lift pin 8 out of the board and reinstall the rectifiers the amp protects
If I lift pin 8 out of the board and reinstall the rectifiers the amp protects
Are you saying that there is no drive from the 3525 when the rectifiers are in the circuit and pin 8 at 5v?
There is only 5 volts on pin 8 if the rectifiers are removed or if I lift pin 8 off the board .
If pin 8 is off the board and the the rectifiers are in circuit the amp will not power up at all since I don’t get drive to the fets . The gate leg remains at 0 volts
If pin 8 is off the board and the the rectifiers are in circuit the amp will not power up at all since I don’t get drive to the fets . The gate leg remains at 0 volts