would someone be able to give me some guidence fixing this orion amp?

chevellebbc · 12th May 2012, 10:10 PM

its an orion xtr pro 2400, i sold the amp and the guy blew mosfets.
i've done very minor work with this type of thing in the past and was hoping i could figure it out.. but i cannot lol
i've removed all the fet's (8) on each side. i cannot find what is wrong besides the fet's. when i slightly tap the new fet inplace it arc's. (i think it would blow if it were placed there etc.) i put an old one in it doesnt arc but the the voltage on the gate resistor jumps to 12 volts. isn't is supposed to be under 5 volts etc. also there is a small board mounted veritcally. on that board on the very bottom where it attaches to the main board the two prongs (soldered) gets hot even without any of the fets attached. all the gate resistors read 4 volts. where they attach to the fet. i havent removed any to check the ohms. i really dont know if im jumping steps just doing what i can without distroying something else..
thanks in advance to anyone who may help

nigelwright7557 · 12th May 2012, 10:22 PM

I would check for shorted mosfets first.
Even if you find them faulty there could be problems with the driver circuit.
I would check the driver circuit transistors too.

chevellebbc · 13th May 2012, 12:40 AM

Thanks for the reply, where would I find the driver circuit transistors. About 6 mosfets were blown out of the 16. I did remove them all.

chevellebbc · 13th May 2012, 12:57 AM

Thanks for the reply, where would I find the driver circuit transistors. About 6 mosfets were blown out of the 16. I did remove them all.

DREW028 · 13th May 2012, 01:07 AM

If you interested in repairing your amp I'd recommend reading this

Basic Amplifier Repair

Unless someone has a schematics for you amp you will have to trace back where the signal for the gates are coming from. You might be able to visually do this or ohm it.

Have you checked the output transistors?

12th May 2012, 10:10 PM	#1
chevellebbc diyAudio Member Join Date: May 2012	would someone be able to give me some guidence fixing this orion amp? its an orion xtr pro 2400, i sold the amp and the guy blew mosfets. i've done very minor work with this type of thing in the past and was hoping i could figure it out.. but i cannot lol i've removed all the fet's (8) on each side. i cannot find what is wrong besides the fet's. when i slightly tap the new fet inplace it arc's. (i think it would blow if it were placed there etc.) i put an old one in it doesnt arc but the the voltage on the gate resistor jumps to 12 volts. isn't is supposed to be under 5 volts etc. also there is a small board mounted veritcally. on that board on the very bottom where it attaches to the main board the two prongs (soldered) gets hot even without any of the fets attached. all the gate resistors read 4 volts. where they attach to the fet. i havent removed any to check the ohms. i really dont know if im jumping steps just doing what i can without distroying something else.. thanks in advance to anyone who may help

12th May 2012, 10:22 PM	#2
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	I would check for shorted mosfets first. Even if you find them faulty there could be problems with the driver circuit. I would check the driver circuit transistors too. __________________ http://www.murtonpikesystems.co.uk PCBCAD50 pcb design software.

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13th May 2012, 12:40 AM	#3
chevellebbc diyAudio Member Join Date: May 2012	Thanks for the reply, where would I find the driver circuit transistors. About 6 mosfets were blown out of the 16. I did remove them all.

13th May 2012, 12:57 AM	#4
chevellebbc diyAudio Member Join Date: May 2012	Thanks for the reply, where would I find the driver circuit transistors. About 6 mosfets were blown out of the 16. I did remove them all.

13th May 2012, 01:07 AM	#5
DREW028 diyAudio Member Join Date: Jun 2004 Location: chicago	If you interested in repairing your amp I'd recommend reading this Basic Amplifier Repair Unless someone has a schematics for you amp you will have to trace back where the signal for the gates are coming from. You might be able to visually do this or ohm it. Have you checked the output transistors?