MTX 500D

jomede · 12:49 AM

Picked up a MTX 500D Amplifier. It does not work. Looking for some help on identifying the burnt components. Also what might have caused them to burn up. Thanks for any help in advance.

Perry Babin · 10th February 2012, 01:00 AM

The regulators failed regularly in these amps because they ran too hot. When they failed, they often destroyed all of the op-amps in the amp. If you don't have any shorted outputs or power supply FETs, the regulator damage may be the only thing you need to repair but expect at least several hours work and expect to replace at least about 20 parts. Refer to the following:
http://www.bcae1.com/temp/mtx500dregulatordamage01.swf

jomede · 10th February 2012, 10:19 AM

Will I still have to replace all of those parts from the link you posted Perry?

jomede · 11th February 2012, 01:53 AM

Can someone ID the burnt parts so I can replace them.

Pioneer621 · 11th February 2012, 03:39 AM

Did you look at Perry’s picture in the link he posted?

It appears he states what the burnt components are & what to replace them with; which are 390 ohm resistors to reduce power dissipation in the regulator transistors. He also states what transistors to replace, zener diodes & more.

All the best & I hope you get it working.

jomede · 14th February 2012, 09:42 AM

1/2 watt resistors? What is the value of the 2 Zener Diodes?

Pioneer621 · 14th February 2012, 07:10 PM

Yeah 1/2-watt resistors will likely be ok. I’m guessing 1-watt resistors would not hurt for that application either.

The zener diodes should be labeled with there part number, which then you can use to find there specs. Take them out carefully & look at the number.

They are likely 1N4746 zener’s; that’s what they are in my blown MTX 250D, should be the same for your 500D. They are 18v zener diodes, 1-watt I believe. Again you can take yours out to be sure.

10th February 2012, 12:03 AM	#1
jomede diyAudio Member Join Date: Jan 2012	MTX 500D Picked up a MTX 500D Amplifier. It does not work. Looking for some help on identifying the burnt components. Also what might have caused them to burn up. Thanks for any help in advance. Last edited by jomede; 10th February 2012 at 12:49 AM.

10th February 2012, 01:00 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The regulators failed regularly in these amps because they ran too hot. When they failed, they often destroyed all of the op-amps in the amp. If you don't have any shorted outputs or power supply FETs, the regulator damage may be the only thing you need to repair but expect at least several hours work and expect to replace at least about 20 parts. Refer to the following: http://www.bcae1.com/temp/mtx500dregulatordamage01.swf __________________ 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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11th February 2012, 01:53 AM	#4
jomede diyAudio Member Join Date: Jan 2012	Can someone ID the burnt parts so I can replace them.

11th February 2012, 03:39 AM	#5
Pioneer621 diyAudio Member Join Date: Mar 2007	Did you look at Perry’s picture in the link he posted? It appears he states what the burnt components are & what to replace them with; which are 390 ohm resistors to reduce power dissipation in the regulator transistors. He also states what transistors to replace, zener diodes & more. All the best & I hope you get it working.

14th February 2012, 09:42 AM	#6
jomede diyAudio Member Join Date: Jan 2012	1/2 watt resistors? What is the value of the 2 Zener Diodes?

14th February 2012, 07:10 PM	#7
Pioneer621 diyAudio Member Join Date: Mar 2007	Yeah 1/2-watt resistors will likely be ok. I’m guessing 1-watt resistors would not hurt for that application either. The zener diodes should be labeled with there part number, which then you can use to find there specs. Take them out carefully & look at the number. They are likely 1N4746 zener’s; that’s what they are in my blown MTX 250D, should be the same for your 500D. They are 18v zener diodes, 1-watt I believe. Again you can take yours out to be sure.

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