Quedfathers 8k

[megael9]

Hello everyone,
This amps powers up just normal, but the audio output is very low.
Power supply is generating over 200 volts.
Any idea?

 

[Bertje]

If this is korean board (think so...):
Audio inputsignal on the class d driverboard is ok?
12v 7812 regulators ok?

 

[Bills amps]

check to see if you have drive coming off the driver card. Us the scope and probe the gate resistors on all he fets.

 

[Perry Babin]

If the audio is clean but low, it's likely that it's a preamp issue. Set the following:

gain > max
crossover > max frequency
subsonic > lowest frequency
Bass boost > maximum boost

 

[megael9]

I’m getting 3,9 volts out of the audio driver card to the
Gate of the audio output Mosfets.
Very low or no signal going into pin # 3 of the 7 pin
Connector on the driver card.
This is most likely a pre amp issue.
Any one knows which of the TL084 brings the signal to PIN number 3
Of the 7 PIN connector of the driver Card?

 

[Perry Babin]

If the amp is functioning, you can't look for signal on the driver board header. You have to look on the non-driver board end of the resistor feeding pin 3 of 7.

 

[megael9]

It looks like a capacitor is coupling the signal to pin 3. However there is no signal at that capacitor.

 

[Perry Babin]

How close it it to the attached diagram?