C is a resistor?
Rgnd and Cgnd are typically between the primary and secondary grounds. Is that true here?
Rgnd and Cgnd are typically between the primary and secondary grounds. Is that true here?
C is a resistor . At least it appears to be its badly burned and can’t make out what it is . Also I can’t get any reading on it at all off the board in either ohms setting or the capacitor setting on the meter
And yes they are between primary and secondary ground
And yes they are between primary and secondary ground
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The photo is out of focus but you can see one example that may be similar below.
If nothing else, it's a good starting point.
If nothing else, it's a good starting point.
According to the schematic CGND is a 0.1uf cap
And RGND is a 1K cap .
Should I try that combo and see if it works ?
And RGND is a 1K cap .
Should I try that combo and see if it works ?
Yes.
These aren't critical. The worst that should happen with them missing/defective is a loss of reference ground on the secondary.
These aren't critical. The worst that should happen with them missing/defective is a loss of reference ground on the secondary.
No .
And I also checked the power supply fets for drive signals .
I only get drive signals on half the power supply fets .
And I also checked the power supply fets for drive signals .
I only get drive signals on half the power supply fets .
Ok I reflowed the solder on the driverboard to main board and got drive on all the fets .
I also see square waves on the 10 ohm resistors
I also see square waves on the 10 ohm resistors
Do the regulators need to be in circuit in order to get input voltage?
I placed the black probe on the ground pad for the regulator and checked for input voltage which I assume is rail voltage and get 0.68 volts I also checked both sides of the 10 ohm resistors and only get 0.68 volts on those as well
I placed the black probe on the ground pad for the regulator and checked for input voltage which I assume is rail voltage and get 0.68 volts I also checked both sides of the 10 ohm resistors and only get 0.68 volts on those as well
The 10 ohm resistors have a square wave, not DC.
What is the amplitude of the square wave on the 10 ohm resistors?
What is the amplitude of the square wave on the 10 ohm resistors?
Ok now I have input voltage .
+ - 27 volts
Replaced the 10 ohm resistors and regulators .
When I power the amp up it just burns the 10 ohm resistors
+ - 27 volts
Replaced the 10 ohm resistors and regulators .
When I power the amp up it just burns the 10 ohm resistors
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Do BOTH 10 ohm resistors burn every time?
Looking at the regulator input pads, do you have clean DC?
Looking at the regulator input pads, do you have clean DC?