Luxman M12 issues... Hoping for help

[Strgazr1967]

I recently picked up a gorgeous setup consisting of a M12 amp, CX 101 Pre-amp and TX 101 tuner. MINT in every aspect. Powered up the unit and to my dismay there was no output from the left channel. I started the normal trouble shooting of swapping speakers, cables, checking fuses, swapping inputs etc. Just silence.

Research seems to point to the DML-01 having gone bad. Upon opening up the unit I found that the right side DML has been replaced. the left was still original. I am also thanking my lucky stars I was using cheap speakers to test as placing a Fluke 87 on the speaker outputs showed an offset, after 5 minute warm up of 277 mv on the right channel and 207 on the left. Factory spec is 0 +- 20mv.

This unit is packed together very tightly. The service manual does not go into detail about disassembly so I am going very slowly. Any thoughts or items I can test besides what I have done? I would really like to repair this unit and have access to replacement DML’s which is a good thing. From the factory this unit had some amazing performance numbers based on the included QC check sheet that came with it. I have all the original packing, manuals and warranty cards for the entire system and would really like to keep this setup.

Attached is the original test sheet.

Any help would be greatly appreciated.

Best regards,

Bobby

 

[Strgazr1967]

Images of the 2 DML’s and the unit as I opened and set it up.

 

[clinic-audio]

Hello

we can't see anything in your first picture ......

 

[Strgazr1967]

That’s weird because I see it in my post. Try this again.

 

[Blue Shadow]

Get the DML and move forward with replacement. Ask on the Luxman yahoo group if you need guidance.

 

[Blue Shadow]

Did you get bait and switched to the CX/TX combo vs the -12 combo?