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This is strange! I think the sensor relays the MUTE instruction to the MCL2AV via the data stream, and your IR is working so the mute should be as well. I did once have to take apart an MCL2 sensor to fix a faulty mute switch – from memory it simply wasn’t making the correct electrical contact when I pressed the button. So a faulty switch is not unheard off, but it seems a strange co-incidence that neither of yours work!
I think your assumption about the Mute function being through the data stream is true for the MCL2AV. On the diagram for the IR eye /Transreceiver in the service manual the yellow wire is connected to a output called mute on the chip. (note the servicemanual is for a type 2021 and the 2 I have is type 2047, so there might be differences)
However on the MCL2AV it seems like it is connected back to the grey wire which is is also an output of some kind on the IR board chip.
On the MCL2A diagram the yellow wire is conencted directly to the ciruit with the mute relay for the speaker, so it might be used differently on that unit.
Good to know that not nesecarily broken. For good meassure I will try to make a MCL cable and hook the MCL2AV up to my BM5500 to see if everything works as expected there. just found a bag with MCL cable and speakerlink connectors in my storage today. Also in the bag was an extra IR eye of the same tape as used with the MCL2AV just wired up with a minijack from when I used it with a Beoport many years ago. Made me remember that it came from a MCL2AV I had over 20 years ago, but didn’t know how to use at that time, so it probably ended up as E waste
So got the MCL cable soldered to the cable and hooked it up to the MCL2AV with just speakers connected to the PL outputs. Radio from the BM5500 going throug just fine, but the mute button on the IR eye still doesn’t work.
tried the other IR eye but it would not respond to IR. Opening it up it had som modification inside where the yellow wire was connected to an extra transistor. Don’t know what thats about, but I also have a cut of 7 pin din connector that was on its cable when I got it. The former owner was in B&O ‘s R&D department back then, so he might have used it for something fancy before I got it. I will try to reverse the modification and try it again.When I had the BM5500 connected I also made the connection from the MCL2Av to the 1611 and BC6, and control of the BM5500 sources from the BC6 works fine through all these connectionsToday I finally replaced some unused coax wires with Cat7 cables and re-added my BeoMaster 6500 / BeoGram CD 7000 combo to my set-up. They are in the attic (study) and connected through a 1611 to go from MCL to ML, and a BLC to go from ML to NL.
I made a little overview of the whole network :-). 
Nice setup and great system diagram. I wonder why the need for two BLC’s in this setup though?
One little nit picky detail; the connection between the 1611 converter and the BM6500 is actually Datalink/Audio Aux Link and not MCL.
Got time for some more testing today before i began the repair on the MCL 2AV.
I think it has been mentioned before that my MCL2AV is a type 2020, but there is no sticker with the SW version. Only sticker I could find is on the Eprom.
Before I began my testing i made a reset of settings on the BC6 from the service menu as I was nervous that there could be unwanted settings made through the years that could affect the tests. For example both the analog and Digital TV tuner had been disabled.
MCL2AV stand alone option 1.5 and 2.5 + IR eye + PL speakers + BC3500 + iphone on CD input
I started with the MCL2AV in stand alone mode to confirm that things worked as expected. In both option settings 1.5 and 2.5 selection of both CD and tape input worked as expected with shift+radio+6/7 commands. And tape command was working when BC3500 was connected. When in option 1.5 AV + Video source command opens the Aux input. from all inputs music playing on speakers connected to the PL ports.
BC6 opt. 2 +1611 + MCL2AV opt 2.5 +IR eye + PL speakers + BC3500 + Iphone on CD input. All in same room
IR eye on MCL2AV will not react at all to IR commands even when blocking the IR on BC6. It seems like it’s disabled, so all IR is through the BC6
Mute button on IR eye has no function (but LED turns on and off), no long press standby
Full control of BC3500 with tape commands.
Cd input starts up with shift + Radio + 7 without problem
AV + Video Source just changes to that video source on the TV. No sound on MCL2AV PL speakers. In fact all the time in this scenario only very faint sound would come out of the PL speaker output on MCL2AV event when turning the volume up on the conencted computer speakers.
BC6 opt. 2 +1611 + MCL2AV opt 1.5 +IR eye + PL speakers + BC3500 + Iphone on CD input. All in same room but should be in 2 rooms in a real case scenario
Ir eye i functioning on the MCL2 AV, so had to block the IR sensor that I didn’t want tor receive the signals in this test.
Mute button on IR eye still has no function (but LED turns on and off) no long press standby, so I might have a defect somewhere.
Mute and volume control with remote works independently for
Full control of BC3500 from both MCL2AV and BC6, Start/stop and FF/RW affects both sources (stop in one room stop for all rooms etc.)
Cd input starts up independently on both sources with shift + Radio + 7
Sound is comming out of PL speaker output on MCL2AV
AV + Video Source command moves sound from BC6 video source to MCL2AV speakers, but not back when pressed once more. Can only go away with standby or choosing another source.
Short press standby when pointing at the BC6 IR sensor only turns off TV. For the MCL2AV a short press turns off MCL2 AV, but not TV. A long press pointing at the BC6 will turn off both devices.
So thats it for todays testing. I think the results are getting more stable, when you know what to expect, and I can see a use for both of the tested cases here either in the same room for the first one or i separate rooms for the second one.
