If you haven't checked the 12v supply do so.
Enable the IC to confirm that you have about 12v across C864.
Do you have rail to rail oscillation of 91k when the IC is enabled?
Enable the IC to confirm that you have about 12v across C864.
Do you have rail to rail oscillation of 91k when the IC is enabled?
I soldered back on Q932, and these are the readouts at each of pins 1-8 of IR2110S:
Pin 8 HOUT/HO = ~240V square wave at 91k (modulates when audio applied)
Pin 7 VH/VB = ~240V square wave at 91k (modulates when audio applied)
Pin 6 HFG/VS = ~225V square wave at 91k (modulates when audio applied)
Pin 5 NC2 = ~7V square wave at 91k (modulates when audio applied)
Pin 4 NC1 = ~3.75V square wave at 91k (modulates when audio applied)
Pin 3 VL/VCC = -106VDC
Pin 2 GND/COM
Pin 1 LOUT/LO = ~15V square wave at 91k (modulates when audio applied)
Pin 8 HOUT/HO = ~240V square wave at 91k (modulates when audio applied)
Pin 7 VH/VB = ~240V square wave at 91k (modulates when audio applied)
Pin 6 HFG/VS = ~225V square wave at 91k (modulates when audio applied)
Pin 5 NC2 = ~7V square wave at 91k (modulates when audio applied)
Pin 4 NC1 = ~3.75V square wave at 91k (modulates when audio applied)
Pin 3 VL/VCC = -106VDC
Pin 2 GND/COM
Pin 1 LOUT/LO = ~15V square wave at 91k (modulates when audio applied)
Now when I switch on the amp, the subwoofer (Rockford Fosgate T210D2 at 4Ohm) pops inwards for a split second, then the cone returns to normal, but a low hum can be heard, and when I check the waveform on the speaker terminals I can see a small waveform there, with no audio coming in through the RCAs, so I think that's the low hum. That's not really the problem though, as the inwards popping of the sub becomes more intense the more I turn the gain pot. Once the gain reaches halfway point and over, that split second pop of the sub becomes so great that it even causes the amp to flash its protect light for only that split second. If those side effects are to be ignored, I can run an audio track through the RCAs and the audio can be heard through the sub, but at very low power (as I assume the PRS-D2000SPL must be capable of ripping the subwoofer apart but it barely runs it right now).
Now I also did measure the 2 banks of 4 power MOSFETs, from Q872 to Q869 and from Q868 to Q865, those are the measurements:
The bank of MOSFETs from Q872 to Q869 gets pretty hot after only about a minute of on-time (thank god Pioneer PRS-D2000SPL is designed so that it can be taken out of the aluminium chassis but the mosfets are still all mounted to a thick aluminium heatsink bar, makes troubleshooting safer for sure)
Q872 S = -125VDC, D = 225V Square Wave, G = 16V Square Wave offset by -115VDC (negative rail V I assume? But that 16V wave doesn't seem like it should be there, causing the heating possibly?)
Q871 S = -125VDC, D = 225V Square Wave, G = 16V Square Wave offset by -115VDC
Q870 S = -125VDC, D = 225V Square Wave, G = 16V Square Wave offset by -115VDC
Q869 S = -125VDC, D = 225V Square Wave, G = 16V Square Wave offset by -115VDC
This bank remains cool
Q868 S = 225V Square Wave, D = +106VDC (positive rail?), G = 235V Square Wave (seems about 10V higher, with the rising edge peak slightly curved)
Q867 S = 225V Square Wave, D = +106VDC, G = 235V Square Wave (seems about 10V higher, with the rising edge peak slightly curved)
Q866 S = 225V Square Wave, D = +106VDC, G = 235V Square Wave (seems about 10V higher, with the rising edge peak slightly curved)
Q865 S = 225V Square Wave, D = +106VDC, G = 235V Square Wave (seems about 10V higher, with the rising edge peak slightly curved)
Now I also did measure the 2 banks of 4 power MOSFETs, from Q872 to Q869 and from Q868 to Q865, those are the measurements:
The bank of MOSFETs from Q872 to Q869 gets pretty hot after only about a minute of on-time (thank god Pioneer PRS-D2000SPL is designed so that it can be taken out of the aluminium chassis but the mosfets are still all mounted to a thick aluminium heatsink bar, makes troubleshooting safer for sure)
Q872 S = -125VDC, D = 225V Square Wave, G = 16V Square Wave offset by -115VDC (negative rail V I assume? But that 16V wave doesn't seem like it should be there, causing the heating possibly?)
Q871 S = -125VDC, D = 225V Square Wave, G = 16V Square Wave offset by -115VDC
Q870 S = -125VDC, D = 225V Square Wave, G = 16V Square Wave offset by -115VDC
Q869 S = -125VDC, D = 225V Square Wave, G = 16V Square Wave offset by -115VDC
This bank remains cool
Q868 S = 225V Square Wave, D = +106VDC (positive rail?), G = 235V Square Wave (seems about 10V higher, with the rising edge peak slightly curved)
Q867 S = 225V Square Wave, D = +106VDC, G = 235V Square Wave (seems about 10V higher, with the rising edge peak slightly curved)
Q866 S = 225V Square Wave, D = +106VDC, G = 235V Square Wave (seems about 10V higher, with the rising edge peak slightly curved)
Q865 S = 225V Square Wave, D = +106VDC, G = 235V Square Wave (seems about 10V higher, with the rising edge peak slightly curved)
The low-side with the source on the negative rail should have a drive signal that goes about 10v above the negative rail and back all of the way down to the negative rail. If it's not going back to the negative rail, that can cause excessive heating.
The standard configuration for this type of driver is:
HS gate swinging with HS source plus about 10v above the source
HS drain connected to positive rail
HS source driving rail to rail
LS gate negative rail to about 10v
LS drain driving rail to rail (directly connected to HS source)
LS source connected to negative rail.
The standard configuration for this type of driver is:
HS gate swinging with HS source plus about 10v above the source
HS drain connected to positive rail
HS source driving rail to rail
LS gate negative rail to about 10v
LS drain driving rail to rail (directly connected to HS source)
LS source connected to negative rail.