Sony XM-405EQX pulling 8 amps..

marko · 24th June 2011, 04:45 PM

Hi all, is anyone familiar with this amp? last of the decent Sony stuff, seams quite well built inside! anyway, the issue is it's stuck in protection and pulling 8 amps, all psu fets and outputs check out OK, something tells me it's a shorted transformer, I poked around a bit there and amp draw is around 1 amp now but amp still in protection.. will measure V on pwm if that helps..

Mark.

marko · 24th June 2011, 05:34 PM

kinda fixed this! as mentioned above, the amp is now only pulling 1amp and works fine, but I wriggle the transformer it goes back up to 8amps! i can see where it's shorting and it's the thinner wires. what can I use to isolate the wires? lacquer of some description?

Perry Babin · 24th June 2011, 07:21 PM

It depends on the point where it's shorted. If you can slide an adhesive coated insulator (can be as simple as a piece of paper coated with adhesive), that will stop the windings from shorting.

24th June 2011, 04:45 PM	#1
marko diyAudio Member Join Date: May 2004 Location: donnyuk	Sony XM-405EQX pulling 8 amps.. Hi all, is anyone familiar with this amp? last of the decent Sony stuff, seams quite well built inside! anyway, the issue is it's stuck in protection and pulling 8 amps, all psu fets and outputs check out OK, something tells me it's a shorted transformer, I poked around a bit there and amp draw is around 1 amp now but amp still in protection.. will measure V on pwm if that helps.. Mark.

24th June 2011, 07:21 PM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	It depends on the point where it's shorted. If you can slide an adhesive coated insulator (can be as simple as a piece of paper coated with adhesive), that will stop the windings from shorting. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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24th June 2011, 05:34 PM	#2
marko diyAudio Member Join Date: May 2004 Location: donnyuk	kinda fixed this! as mentioned above, the amp is now only pulling 1amp and works fine, but I wriggle the transformer it goes back up to 8amps! i can see where it's shorting and it's the thinner wires. what can I use to isolate the wires? lacquer of some description?

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