MTX 6500 D

mike49504 · 12th October 2011, 03:29 PM

I got this in for repair..

The amp powers up and produces both + - rail voltage..

It also produces + - regulated voltages on the op-amps..

Amp has no output..

Any ideas?

Perry Babin · 12th October 2011, 04:07 PM

Rail to rail oscillation on the outputs?

mike49504 · 12th October 2011, 04:12 PM

I dont see any..

Perry Babin · 12th October 2011, 04:28 PM

What work has been done on the amp?

mike49504 · 12th October 2011, 04:37 PM

The amp has output but very very low output ..

No work has been done to this amp

mike49504 · 12th October 2011, 05:36 PM

The voltage directly across R140 is -0.01 and R142 is 0

Dont know if this helps any

Perry Babin · 12th October 2011, 10:47 PM

You need to definitively determine whether there is rail-rail oscillation on the output transistors.

mike49504 · 14th October 2011, 12:32 AM

Yes the amp has rail to rail Oscillation ...

Still no output..

Perry Babin · 14th October 2011, 12:43 AM

When driving signal into the amp, do you have clean signal on pins 1 or 7 of the op-amp indicated in the photo?

mike49504 · 14th October 2011, 12:56 AM

NO

12th October 2011, 03:29 PM	#1
mike49504 diyAudio Member Join Date: Sep 2006	MTX 6500 D I got this in for repair.. The amp powers up and produces both + - rail voltage.. It also produces + - regulated voltages on the op-amps.. Amp has no output.. Any ideas?

12th October 2011, 04:07 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Rail to rail oscillation on the outputs? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

12th October 2011, 04:28 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	What work has been done on the amp? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

12th October 2011, 10:47 PM	#7
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	You need to definitively determine whether there is rail-rail oscillation on the 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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12th October 2011, 04:12 PM	#3
mike49504 diyAudio Member Join Date: Sep 2006	I dont see any..

12th October 2011, 04:37 PM	#5
mike49504 diyAudio Member Join Date: Sep 2006	The amp has output but very very low output .. No work has been done to this amp

12th October 2011, 05:36 PM	#6
mike49504 diyAudio Member Join Date: Sep 2006	The voltage directly across R140 is -0.01 and R142 is 0 Dont know if this helps any

14th October 2011, 12:32 AM	#8
mike49504 diyAudio Member Join Date: Sep 2006	Yes the amp has rail to rail Oscillation ... Still no output..

14th October 2011, 12:56 AM	#10
mike49504 diyAudio Member Join Date: Sep 2006	NO

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