MTX 6500D Schematic?

copekyle · 8th October 2009, 05:43 PM

Hey guys-
So I had my amp blow. There is a constant 60V on output with no signal on the input. I just power it up and I have 60V on output. I started by replacing the FET's but this did not solve my problem. Does anyone have any ideas? I've contacted MTX and they, of course, won't give me a schematic. I've started tracing the board and drawing a schematic but I figured I'd ask here too.

Thanks
Kyle

Iain McNeill · 8th October 2009, 05:50 PM

Yes, that sounds like a hard fail (exceeding SOAR limits) which typically is pretty catastrophic. My process in these cases is to take out all actives devices and test each individually. You'll probably find the drivers and even the VAS stage are shot.

Take photo's before you start and note where each tranny goes. Good luck!

BTW - I deleted the duplicate thread

Perry Babin · 8th October 2009, 06:22 PM

The amp is very similar to some of the sony amps. If you want a sony service manual, email me.

babin_perry@yahoo.com

When the outputs fail, the highlighted components in the attached file are the ones that most commonly fail.

copekyle · 8th October 2009, 07:01 PM

Perry-
Thank you for the picture. Those were most the parts I was looking at. I know the resistor bank is good. (the 6, 220 ohm resistors). I do not know what the part numbers are on the rest of the circled parts. The packages are labeled but the labels do not bring back relevant search results.

thanks
kyle

copekyle · 8th October 2009, 07:12 PM

Ok... I found the bad part but I'm unsure what the real part number is. It's a fairchild part and it has D127 A06 written on it. Any ideas?

Perry Babin · 8th October 2009, 08:17 PM

Pzta06?

copekyle · 8th October 2009, 08:23 PM

Perry-
That's the one. But I did some deeper testing of all the SMD transistors and it seems that atleast 7 of them blew and without a schematic, this project is going to be abandoned and I'll just design my own amp.

Kyle

Perry Babin · 8th October 2009, 08:35 PM

All of the transistors can be crossed. Look up the codes on the following site?

http://www.marsport.org.uk/smd/mainframe.htm

8th October 2009, 05:43 PM	#1
copekyle diyAudio Member Join Date: Sep 2009	MTX 6500D Schematic? Hey guys- So I had my amp blow. There is a constant 60V on output with no signal on the input. I just power it up and I have 60V on output. I started by replacing the FET's but this did not solve my problem. Does anyone have any ideas? I've contacted MTX and they, of course, won't give me a schematic. I've started tracing the board and drawing a schematic but I figured I'd ask here too. Thanks Kyle

8th October 2009, 08:17 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Pzta06? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

8th October 2009, 08:35 PM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	All of the transistors can be crossed. Look up the codes on the following site? http://www.marsport.org.uk/smd/mainframe.htm __________________ 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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8th October 2009, 05:50 PM	#2
Iain McNeill diyAudio Moderator Join Date: Oct 2007 Location: Santa Cruz, California	Yes, that sounds like a hard fail (exceeding SOAR limits) which typically is pretty catastrophic. My process in these cases is to take out all actives devices and test each individually. You'll probably find the drivers and even the VAS stage are shot. Take photo's before you start and note where each tranny goes. Good luck! BTW - I deleted the duplicate thread

8th October 2009, 07:01 PM	#4
copekyle diyAudio Member Join Date: Sep 2009	Perry- Thank you for the picture. Those were most the parts I was looking at. I know the resistor bank is good. (the 6, 220 ohm resistors). I do not know what the part numbers are on the rest of the circled parts. The packages are labeled but the labels do not bring back relevant search results. thanks kyle

8th October 2009, 07:12 PM	#5
copekyle diyAudio Member Join Date: Sep 2009	Ok... I found the bad part but I'm unsure what the real part number is. It's a fairchild part and it has D127 A06 written on it. Any ideas?

8th October 2009, 08:23 PM	#7
copekyle diyAudio Member Join Date: Sep 2009	Perry- That's the one. But I did some deeper testing of all the SMD transistors and it seems that atleast 7 of them blew and without a schematic, this project is going to be abandoned and I'll just design my own amp. Kyle

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