Behringer PMP3000 PSU Fault

[berty1]

Hi,

I'm trying to repair Behringer PMP3000 mixer/amp. It has a fault in the PSU section.

The PSU PCB is SPS1000/02.

I really could do with a schematic. So if anyone knows the where I can get one I would be grateful.

The closest schematic I can find is a Yamaha EMX5000. This seems to be 'sort of' similar around the PSU section. Someone has copied someone !!!!!

The component damage was as follows:-

22R 10W mains input resistor blown apart.

IGBT's 1MBK50D-060S short circuit

Diode on the gate of one of the IGBT's short circuit

I have also replaced the IR2153 device.

When I apply power the relay, across the two 22R 10W resistors is not engaging. ( presumably cuz no 12V present to energize it ) so I have to turn off quickly. So fault is still there.

Is it OK to bring these types of PSU up using a variac ?. If so what voltage would you expect the PSU to start working at ?

I cant leave power on for long enough to try to fault find.

And I have no shematic to try to isolate sections.

So any help appreciated.

Thanks

Albert

[Eva]

Trace the 12V source

Is the IR2153 receiving the proper supply voltage while the relay doesn't?

[berty1]

Thanks for the reply.

The IR2153 is supplied by a TOP221 as opposed to a linear regulator.

The problem is I can't apply power long enough to probe around to see what voltages there are.

I was wondering if I could lower the mains input voltage with a variac to a safe level that the PSU would still operate, but with out burning up the 22R resistors!!.


I assume the two 22R 10 watt resistor in series with the mains input are for slow switch on.

I've traced one side of the relay to the collector of an other transistor.

This implies that the relay is switched somehow !!

I really am snookered without a schematic..

[microsim444]

Originally Posted by berty1

Hi,

I'm trying to repair Behringer PMP3000 mixer/amp. It has a fault in the PSU section.

The PSU PCB is SPS1000/02.

I really could do with a schematic. So if anyone knows the where I can get one I would be grateful.

The closest schematic I can find is a Yamaha EMX5000. This seems to be 'sort of' similar around the PSU section. Someone has copied someone !!!!!

The component damage was as follows:-

22R 10W mains input resistor blown apart.

IGBT's 1MBK50D-060S short circuit

Diode on the gate of one of the IGBT's short circuit

I have also replaced the IR2153 device.

When I apply power the relay, across the two 22R 10W resistors is not engaging. ( presumably cuz no 12V present to energize it ) so I have to turn off quickly. So fault is still there.

Is it OK to bring these types of PSU up using a variac ?. If so what voltage would you expect the PSU to start working at ?

I cant leave power on for long enough to try to fault find.

And I have no shematic to try to isolate sections.

So any help appreciated.

Thanks

Albert

I have repaired large number of YAMAHA amplifiers in the past, be careful , NASTY surprise may occur of you don't know how service this Power Supply, and that IGBT cost around 50US$ each.

DONOT Attempt to replace parts, Unless you CHECK 20 Times all other parts, and you may TRY using a 70 AC to power the SMPS ALONE, it should WORK, for testing
I have that service manual on hand, mail me

[Zero Cool]

I need schematics as well

tetech2@doitnow.com

[authlxl]

Upload picture for you PSU,High resolution，I'll tell you how to repair on pic step by step.

[idoitmyself]

Is the following IGBT a good replacement for 1MBK50D-060S?
http://www.st.com/stonline/products/...gw45nc60wd.pdf

[ontoaba]

Make sure that you checked the output stage and disconnecting any load.
You may placing big resistor between IGBT collector and transformer instead of connect it, to limit the current, says 1K-2Kohm 10Wor20W. With no load, it may work like normal if there already no failure.
There is yamaha EMX5000 at eserviceinfo.com upluaded by andymn.

[idoitmyself]

Originally Posted by onto aban

Make sure that you checked the output stage and disconnecting any load.
You may placing big resistor between IGBT collector and transformer instead of connect it, to limit the current, says 1K-2Kohm 10Wor20W. With no load, it may work like normal if there already no failure.
There is yamaha EMX5000 at eserviceinfo.com upluaded by andymn.

I have schematics for my Behringer PMP3000. What do you mean by "check the output stage"? Rectifier after the transformer? There are not many active components after IGBTs.

And do you know if STGW45NC60WD is a good replacement for the original 1MBK50D-060S?
Thanks.

[Zero Cool]

These units have a fault in the audio output stage that causes the PSU to fail. fredy2 has done a lot of work and has written up some information how to repair these units here:

M50D060S Datasheet???

If you do not correct the cause of the fault, the PSU will blow again.


Zc