So i am in the process of repaired a few dozen of these amplifiers. This one has good output transistors, rail.and regulated voltages are present. I have 25.46vdc on the speaker terminals?
replaced all the caps c61_c63 100nf 100v capacitors.
all three coresponding diodes 12-24-12v
replaced all the caps c61_c63 100nf 100v capacitors.
all three coresponding diodes 12-24-12v
at speaker terminal 10x.
input is 40hrz ampl. 4v duty. cycle 50.% (same signal i always use)
Please clarify. Are you describing the input signal as 4Vp-p, 40hz?
Is this a sinewave or a squarewave? How does the 50% duty cycle apply?
What is the Rail Voltage? The squarewave drive voltage to the output mosfets will be half the rail voltage, due to 50% Duty Cycle.
A screenshot of the waveform before and after the output coils with and without signal would be helpful.
Is there still an issue here?
while trying to get the screen shots i noticed that the amplifier was back into protection. Only remote and ground were applied.
I'm not sure whats going on here, you should have a square wave if you have a square wave at Q103. I'm unclear what pin 1 is. Can you identify if this is the gate or the source. The Drain would be the middle pin.
before output coils
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