MPS 2240 problem
MPS 2240 problem
I have a mps 2240 that i open up today to check the caps. I never tried it after i bought it so i didn't realised that i had a bad one.
So one of the "lines" in the board is burnt of as you can se in the picture and what i want to know is it possible to fix this with a little wire and what can be the reason it broke?
One of the pictures are not my amp but i put it there to make it easier to se were the damage is.
So one of the "lines" in the board is burnt of as you can se in the picture and what i want to know is it possible to fix this with a little wire and what can be the reason it broke?
One of the pictures are not my amp but i put it there to make it easier to se were the damage is.
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Re: MPS 2240 problem
Too much current perhaps...is the trace open or just discolored.
Re: MPS 2240 problem
its open.
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Re: MPS 2240 problem
If you solder a jumper make sure you power it up with a 5 amp fuse on the b+.
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Re: MPS 2240 problem
i had this one time in a ms275.......the powersupply of you're amp is probably fried.....
replace the 4 irfp044 fets and the gate resistors, and check out for other broken parts..
strip a FTP cable and use one of the 8 wires to replace the broken trace......
yes the 5A fuse is a must or it will happen again with the trace.....
when i had that, i powered that amp up on a 30A fuse with the blown traces as a result....
good luck with it.....
replace the 4 irfp044 fets and the gate resistors, and check out for other broken parts..
strip a FTP cable and use one of the 8 wires to replace the broken trace......
yes the 5A fuse is a must or it will happen again with the trace.....
when i had that, i powered that amp up on a 30A fuse with the blown traces as a result....
good luck with it.....
Re: MPS 2240 problem
Thanks guys. Can you point out the fets and the resistors in the picture it would save me a lot of time.
Re: MPS 2240 problem
I try again. is there anyone here that can point out the gate resistors for me. Not that in to electronics but i think i can replace the broken parts if i know what parts to replace. Thanks
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Re: MPS 2240 problem
They are near the PWM IC.
Re: MPS 2240 problem
As i understand this is the resistors but they are 47ohm resistors if i´m not wrong here.
Thanks for all the help so far.
Thanks for all the help so far.
Re: MPS 2240 problem
Use the same values as you have in there. The values must vary between different revisions of amps.
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M50, MS275, MPS2500, ZX450, ZPA0.3
M50, MS275, MPS2500, ZX450, ZPA0.3
Re: MPS 2240 problem
Is it possible to measure them were they sit or do i fooling my self. Did try and got about 47 ohm´s.
I know it´s cheap stuff but don´t want to mess with it if i don´t need to.
I know it´s cheap stuff but don´t want to mess with it if i don´t need to.
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- Joined: Fri May 13, 2011 12:03 am
Re: MPS 2240 problem
i checked the shematic of mps2240 for you and i can confirm they are 47ohm/0,25w metalfilmalehed wrote:Is it possible to measure them were they sit or do i fooling my self. Did try and got about 47 ohm´s.
I know it´s cheap stuff but don´t want to mess with it if i don´t need to.
hoping you're helped with this....
Re: MPS 2240 problem
Have ordered the fets and the resistors. I hope i can fix this now.
Re: MPS 2240 problem
If you remove the FETs, you can power on the amplifier, and measure the pins on the board where the FETs go, which connect to those resistors. With an o-scope you should see a square wave signal, with a DMM you should measure maybe 6V DC, and around 6V AC as well. The frequency is probably 30kHz. If you get figures anywhere close to these, you then will know the SG2525 PWM controller is functioning correctly. At that point I would put the FETs in, and then pull the rails fuses, and try to power it on. Again, use a small value fuse in case something else is still wrong. If you get both rails to come on, you can proceed.
Got "schooled" by member shawn k on May 10th, 2011...
No longer really "in tune" with the audio industry, and probably have not been for some time.
Hands down the forum's most ignorant member...
Don't even know what Ohm's law is...
No longer really "in tune" with the audio industry, and probably have not been for some time.
Hands down the forum's most ignorant member...
Don't even know what Ohm's law is...