I picked up this MX5000 a week ago and it just arrived. I don't have time to get into it right now, I'm working 12's through the weekend, but I would like to get a few parts on order so I'm hopefully ready.
I rebuilt a MX3000.1 several years ago, and I think these are almost the same amp, but I believe the MX5000 uses the TO-3P/TO-247 sized mosfets in the power supply where the MX3000.1 uses TO-220 devices. Does anyone know off hand what the FETs are? I would like to get some on hand and I am almost certain they are not something I stock. I believe the outputs are IRF9640/IRF640, but if anyone can confirm, that would be awesome.
Anyhow, this is not a real big deal, so please don't go out of your way. I can wait until I can pull it apart myself, however if I can get a head start on some of the common parts, I can probably have them arrive in time for my few days off next week.
Thanks!
Jason
I rebuilt a MX3000.1 several years ago, and I think these are almost the same amp, but I believe the MX5000 uses the TO-3P/TO-247 sized mosfets in the power supply where the MX3000.1 uses TO-220 devices. Does anyone know off hand what the FETs are? I would like to get some on hand and I am almost certain they are not something I stock. I believe the outputs are IRF9640/IRF640, but if anyone can confirm, that would be awesome.
Anyhow, this is not a real big deal, so please don't go out of your way. I can wait until I can pull it apart myself, however if I can get a head start on some of the common parts, I can probably have them arrive in time for my few days off next week.
Thanks!
Jason
I would wait until its taken apart before ordering. I did one of those and it was IRF9640/IRF640 but ive seen them also with FQP12N20/FQP12P20.
While youre at it also check for corrosive and eroded circuit traces under the output coils or where the glue is placed on the circuit.
While youre at it also check for corrosive and eroded circuit traces under the output coils or where the glue is placed on the circuit.
Thanks for the input and the link, that was a nice find. Formas, I know you are right, but I hate opening them up and then having to wait until my next off shift to repair. It did work out that I am getting tomorrow off work though, so I will probably wait for tomorrow morning and opening the amp before I order anything.
Thanks again folks!
Jason
Thanks again folks!
Jason
Well, I had just a few minutes yesterday to take this one apart. I got kind of sidetracked getting a snowmobile up and running and ready for winter so I haven't done any serious troubleshooting yet, but it looks like the power supply mosfets are blown, these large footprint mosfets are pricey! Anyhow, it did not burn as bad as the MX3000.1 I had before did, that one took a fair amount of patching to bring it back to life.
So, at a glance, I need power supply fets. I should have all the parts for the drivers if they are shot too. It looks like this is at least the second time this amp has blown. The outputs are mismatched. It has half IRF640/9640 outputs and half FQP19N20/FQP12P20. It looks like they are pretty much equivalent transistors, but unless I am mistaken they have them mixed in the channels, half IRF, half FQP. It probably isn't necessary for a class D sub amp, but even if the outputs are all still good I am going to go ahead and swap in matching banks. I think it came from Autotek with IRF640/964 parts and I have most of what I will need.
With any luck I will get parts headed this way and work on it next week on my days off work. Are there any upgrades out there for the IRFP064N power supply fets? As long as I am swapping them I may as well upgrade if there is something available.
Later,
Jason
So, at a glance, I need power supply fets. I should have all the parts for the drivers if they are shot too. It looks like this is at least the second time this amp has blown. The outputs are mismatched. It has half IRF640/9640 outputs and half FQP19N20/FQP12P20. It looks like they are pretty much equivalent transistors, but unless I am mistaken they have them mixed in the channels, half IRF, half FQP. It probably isn't necessary for a class D sub amp, but even if the outputs are all still good I am going to go ahead and swap in matching banks. I think it came from Autotek with IRF640/964 parts and I have most of what I will need.
With any luck I will get parts headed this way and work on it next week on my days off work. Are there any upgrades out there for the IRFP064N power supply fets? As long as I am swapping them I may as well upgrade if there is something available.
Later,
Jason
Do you have any suggestion on how to remove the glue without damaging the board?
Thanks,
Jason
As for a possible sub for the power supply fets, has anyone swapped in the IRFP3206 as a replacement for the IRFP064N? It looks like a decent upgrade from looking at the datasheet and it is only a few cents more than the IRFP064N.
Any thoughts?
Thanks,
Jason
Any thoughts?
Thanks,
Jason
I wouldnt personally remove the glue just yet or even try. you could just simply test for continuity along the traces that goes beneath the glue areas.
I don't have any suggestions for substitute FETs. I would use the IRFP064.
If you ever need to remove this adhesive, heat it up a bit and stick the pointed end of a bamboo skewer into it. Twist the skewer and the adhesive will roll up onto it.
If you ever need to remove this adhesive, heat it up a bit and stick the pointed end of a bamboo skewer into it. Twist the skewer and the adhesive will roll up onto it.
Well, I got this amp running for troubleshooting. I still have not ordered parts, lol, I decided to wait until I had some time to mess with it, then I found some TO-247 cased FETs that I had from repairing a buddies power inverter. They are not the right parts, but they are good enough for a pair per supply to get it up and running.
I have a question now though, I haven't tested audio yet, I have the blown channels output fets all out right now but I wanted to make sure I wasn't overlooking anything. The power supply comes up and seems to be good and stable, but it is only +/- 45 Vdc. That seems a little low to me. Does anyone know what the rails are suppose to be in this amp? The rail caps are rated at 80V, it seems like my old Mx3000.1 had rails a fair bit higher.
Thanks,
Jason
I have a question now though, I haven't tested audio yet, I have the blown channels output fets all out right now but I wanted to make sure I wasn't overlooking anything. The power supply comes up and seems to be good and stable, but it is only +/- 45 Vdc. That seems a little low to me. Does anyone know what the rails are suppose to be in this amp? The rail caps are rated at 80V, it seems like my old Mx3000.1 had rails a fair bit higher.
Thanks,
Jason
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