looking fot autotek mean machine 44 schematics

grandam88 · 6th January 2011, 09:15 PM

i have a old school autotek mean machine 44 amp with a blown resistor. i need a schematic for the amp as part was moved then lost(by a friend) all help is appreciated. thanks

Perry Babin · 7th January 2011, 04:06 AM

Can you post a photo of the resistor location?

grandam88 · 9th January 2011, 05:31 PM

here is a picture of the component location. If anybody has this amp plaease tell me what is at 1n4751 on the board, almost direct center of board nest to model number printed on board.

Perry Babin · 9th January 2011, 05:33 PM

That's a 1N4751 Zener diode.

grandam88 · 9th January 2011, 05:41 PM

lol, i figured that number was merely a label for the location on the board, but then i saw the other components are all labeled also.

thanks for the quick reply, the guy that owns this amp has had this blow numerous times, but also he likes to run his amp @ 1 ohm with out flipping the switch over, would this cause the diode failure? of is there possibly an underlying problem?

Perry Babin · 9th January 2011, 05:52 PM

The load on the amp has nothing to do with this. If I'm not mistaken, this diode is the voltage regulator for the op-amps. In amps that tend to overheat this diode, I generally use two 1 watt 15v Zeners in series instead of one 1 watt 30v Zener.

Dr Zeus · 18th January 2011, 06:00 PM

GrandAm88 - Do you still have this amp? I think I have one like it myself worth fixing - its an Autotek 44 by Zed. Can you shoot me a pic or two of the inside plus the component side of the driver board? I have not looked up much on it yet, but one channel seems to have a bad driver. Hope you still got it and got it working!

supertegrs@yahoo.com

Dr Zeus · 06:07 PM

You know what? nevermind I think... I just looked on amp-guts and seems there are two models of Autotek 44. Mine does not have the proprietary 'zed' inline components but does have a vertical driver board, and also mine uses hard-wiring instead of terminals.

Still, they are both Zed made amps right?

6th January 2011, 09:15 PM	#1
grandam88 diyAudio Member Join Date: Jan 2011 Location: houston, tx	looking fot autotek mean machine 44 schematics i have a old school autotek mean machine 44 amp with a blown resistor. i need a schematic for the amp as part was moved then lost(by a friend) all help is appreciated. thanks

7th January 2011, 04:06 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Can you post a photo of the resistor location? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

9th January 2011, 05:33 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	That's a 1N4751 Zener diode. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

9th January 2011, 05:52 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The load on the amp has nothing to do with this. If I'm not mistaken, this diode is the voltage regulator for the op-amps. In amps that tend to overheat this diode, I generally use two 1 watt 15v Zeners in series instead of one 1 watt 30v Zener. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

18th January 2011, 06:04 PM	#8
Dr Zeus diyAudio Member Join Date: Oct 2010	You know what? nevermind I think... I just looked on amp-guts and seems there are two models of Autotek 44. Mine does not have the proprietary 'zed' inline components but does have a vertical driver board, and also mine uses hard-wiring instead of terminals. Still, they are both Zed made amps right? Last edited by Dr Zeus; 18th January 2011 at 06:07 PM.


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9th January 2011, 05:31 PM	#3
grandam88 diyAudio Member Join Date: Jan 2011 Location: houston, tx	here is a picture of the component location. If anybody has this amp plaease tell me what is at 1n4751 on the board, almost direct center of board nest to model number printed on board.

9th January 2011, 05:41 PM	#5
grandam88 diyAudio Member Join Date: Jan 2011 Location: houston, tx	lol, i figured that number was merely a label for the location on the board, but then i saw the other components are all labeled also. thanks for the quick reply, the guy that owns this amp has had this blow numerous times, but also he likes to run his amp @ 1 ohm with out flipping the switch over, would this cause the diode failure? of is there possibly an underlying problem?

18th January 2011, 06:00 PM	#7
Dr Zeus diyAudio Member Join Date: Oct 2010	GrandAm88 - Do you still have this amp? I think I have one like it myself worth fixing - its an Autotek 44 by Zed. Can you shoot me a pic or two of the inside plus the component side of the driver board? I have not looked up much on it yet, but one channel seems to have a bad driver. Hope you still got it and got it working! supertegrs@yahoo.com

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