Xtant 6.1 repair

lumanauw · 20th March 2011, 01:29 AM

I got this Xtant 6.1 which is not working. The rail voltages are there (+/-54V), but there is nothing on the gates of audio output mosfets.
Anyone familiar with this amp? It seems classD.

Perry Babin · 20th March 2011, 01:49 AM

It looks like it's very similar to the MTX6500. If so, the circuit would be similar to the Sony amps. I'd need to see more detail to help.

lumanauw · 20th March 2011, 02:17 AM

Hi, Perry,

Here I take some pictures. There is LM311 sitting at -54VDC as it's ground reference. I don't know if it is the main comparator, or part of protection circuit.

lumanauw · 20th March 2011, 02:18 AM

If it's based on MTX6500, there is LM311 on negative rail

Perry Babin · 20th March 2011, 02:22 AM

It's part of the over-current protection. It's sitting on the negative rail and senses voltage across the 0.22 ohm resistors that are between the negative rail and the source legs of the low side output transistors.

20th March 2011, 01:49 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	It looks like it's very similar to the MTX6500. If so, the circuit would be similar to the Sony amps. I'd need to see more detail to help. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

20th March 2011, 02:22 AM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	It's part of the over-current protection. It's sitting on the negative rail and senses voltage across the 0.22 ohm resistors that are between the negative rail and the source legs of the low side output transistors. __________________ 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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20th March 2011, 02:18 AM	#4
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	If it's based on MTX6500, there is LM311 on negative rail

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