This amp has IRFZ44N and IRF5305 transistors for outputs. one of the IRF5305s was reading shorted and now it is off of the PCB. Nothing much else seems to be degraded.
With the transistor gone the amp powers up and is producing a high ammount of distortion at the outputs. Voltage accross the outputs are ~0.040v.
Does this amp require all output transistors to be fully functioning and clean?
With the transistor gone the amp powers up and is producing a high ammount of distortion at the outputs. Voltage accross the outputs are ~0.040v.
Does this amp require all output transistors to be fully functioning and clean?
TDA7570.
Datasheet: http://www.st.com/stonline/products/literature/ds/13854.pdf
I'll read on about it and see what I can tell from power, inputs/outputs and operation.
Edit: The IC has +25vDC on pin 12, and -25vDC on Pins 26, 27, 58, & 59.
Datasheet: http://www.st.com/stonline/products/literature/ds/13854.pdf
I'll read on about it and see what I can tell from power, inputs/outputs and operation.
Edit: The IC has +25vDC on pin 12, and -25vDC on Pins 26, 27, 58, & 59.
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I now of nothing else that uses the 5305s.
Class D amps can be finicky. Using a sub may work. Try an IRF9640 if you have one.
if you remove all of the outputs and drive a strong signal into the amp, you 'may' see a 10v p-p drive signal on the gates. If all of the gate resistors for the outputs have a clean square wave, the IC may have survived. I don't know if this will work with this amp but it works on various other class D amps.
Class D amps can be finicky. Using a sub may work. Try an IRF9640 if you have one.
if you remove all of the outputs and drive a strong signal into the amp, you 'may' see a 10v p-p drive signal on the gates. If all of the gate resistors for the outputs have a clean square wave, the IC may have survived. I don't know if this will work with this amp but it works on various other class D amps.
It's not that the signal is weak. A weak signal would be a signal with virtually no amplitude.
It's normal to have to increase the intensity as you go towards the maximum sweep rate but you shouldn't have to max it out. The scope's CRT or the internal drive circuit may be a bit weak.
The drive signal looks OK but I'd expect the 'corners' to be a bit more square. Install the new FETs to see if it the driver IC survived.
It's normal to have to increase the intensity as you go towards the maximum sweep rate but you shouldn't have to max it out. The scope's CRT or the internal drive circuit may be a bit weak.
The drive signal looks OK but I'd expect the 'corners' to be a bit more square. Install the new FETs to see if it the driver IC survived.
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