Need help on Lexus - Mark Levinson amp. mod.

100db · 14th February 2007, 02:34 AM

Hi,

I just got one of Mark Levinson car amp (Lexus oem made by Harman/ Becker ) and I would like to use this amp with a typical head unit ( Blaupunkt Bremen MP74 ).

So, I need to change from ML-Lexus specific connectors to a standard RCA / Power & Speaker terminal. I don't know if anybody here experienced this mod. before ?

I can't find any service manual on the web, how can I know that what's functional of each pin in ML connectors ?

Actually I've no clue how to open the cover yet, alreay remove all 6 screws but the cover still stuck.

100db · 14th February 2007, 02:40 AM

Here is a picture of standard connectors

1moreamp · 14th February 2007, 04:07 AM

Is there a aluminum decal on the top side of the amp, If so, under it after you heat it <to soften the glue> You will find the last sets of screws holding it together.
Its the best anti-tamper sealed amp I ever saw. You will severely damage the top cover decal upon removal. You will have a hard time replacing it, and it will show that the unit has been opened.

Once inside the power supply section is quit simple and easily reverse engineered for hot, ground, and turn on.
All internal IC's have been environmentally sealed with some very nice glue like sealant. I believe it will be see through yellow in color if my memory is working well tonight.

Simple testing is achieved by turning the amp on and checking current draw. It should idle below 1 ampere typical.

I would then find the speaker pairs and then simply use a pick tool on the input pins to find them with humm in the speakers.

Or call the dealer in hopes they can and will share the harness pinout.

Good luck, been there and done this one

100db · 15th February 2007, 07:10 AM

Thanks for your advise, I'll trying to contact ML ( Harman/Becker ) to get the functional of each pin instead. Don't want to fire it up yet.

1moreamp · 15th February 2007, 07:15 AM

Good Luck

Let me know if you get a copy from them, I wouldn't mind having it for my files, last time my back was against a wall on this amp, THX

100db · 15th February 2007, 07:23 AM

Yepp, will do.

14th February 2007, 02:34 AM	#1
100db diyAudio Member Join Date: Dec 2005 Location: Bangkok, Thailand	Need help on Lexus - Mark Levinson amp. mod. Hi, I just got one of Mark Levinson car amp (Lexus oem made by Harman/ Becker ) and I would like to use this amp with a typical head unit ( Blaupunkt Bremen MP74 ). So, I need to change from ML-Lexus specific connectors to a standard RCA / Power & Speaker terminal. I don't know if anybody here experienced this mod. before ? I can't find any service manual on the web, how can I know that what's functional of each pin in ML connectors ? Actually I've no clue how to open the cover yet, alreay remove all 6 screws but the cover still stuck.

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14th February 2007, 04:07 AM	#3
1moreamp diyAudio Member Join Date: Dec 2005 Location: Northern California	Is there a aluminum decal on the top side of the amp, If so, under it after you heat it <to soften the glue> You will find the last sets of screws holding it together. Its the best anti-tamper sealed amp I ever saw. You will severely damage the top cover decal upon removal. You will have a hard time replacing it, and it will show that the unit has been opened. Once inside the power supply section is quit simple and easily reverse engineered for hot, ground, and turn on. All internal IC's have been environmentally sealed with some very nice glue like sealant. I believe it will be see through yellow in color if my memory is working well tonight. Simple testing is achieved by turning the amp on and checking current draw. It should idle below 1 ampere typical. I would then find the speaker pairs and then simply use a pick tool on the input pins to find them with humm in the speakers. Or call the dealer in hopes they can and will share the harness pinout. Good luck, been there and done this one

15th February 2007, 07:10 AM	#4
100db diyAudio Member Join Date: Dec 2005 Location: Bangkok, Thailand	Thanks for your advise, I'll trying to contact ML ( Harman/Becker ) to get the functional of each pin instead. Don't want to fire it up yet.

15th February 2007, 07:15 AM	#5
1moreamp diyAudio Member Join Date: Dec 2005 Location: Northern California	Good Luck Let me know if you get a copy from them, I wouldn't mind having it for my files, last time my back was against a wall on this amp, THX

15th February 2007, 07:23 AM	#6
100db diyAudio Member Join Date: Dec 2005 Location: Bangkok, Thailand	Yepp, will do.