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- 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 connectionsI just found the MCL2 sensor that I previously repaired – luckily I had labelled it as being from the kitchen in my last house. It was right next to the cooker hence exposed to a bit of grease over the 30 years that it was fitted.
Anyway, I have just dismantled it to have a look. You have to be a little careful prising the circuit board away from the front face, and I can see that I broke a few plastic clips last time!
Here’s the mute switch when you peel back the plastic:
And here’s the little square metal contact piece that can be removed:
When in position it ‘pops’ in slightly to connect the center PCB contact to the outer edge (ground) to send the mute command. Here’s the PCB with the metal piece removed:
I think that I had use a tiny dab of solder when I last fixed this one (there was a broken trace to the left), but perhaps yours just needs a clean?
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.
When going through the diagrams for the MCL2AV in the servicemanual i noticed some jumpers J4 (opt. TV) and J1 (opt. 5/6). Can’t find J2 and 3 right now.
There are 2 more jumpers (2 and 3) and all of the located with the chips under the metal casing
I know for sure the J1 is cut on mine, and If I remember correctly J3 is mounted, but not J2. Not sure if we can use it for something, but I will check up on the exact ones in use on my MCL2AV.
I know for sure the J1 is cut on mine, and If I remember correctly J3 is mounted, but not J2.
J1 is cut on mine but I think the two ends were touching. J3 mounted but not J2. And J4 looks like it has been scraped to break the contact – there is no continuity.
(yes J2 and 3 seem to be missing from circuit diag)
My MCL2AV Type 2032 is similar, but with J4 intact:
Ok just checked a picture I took of it, and J1 is cut, J2 not mounted, J3 mounted, and J4 seems intact
I cant find any mention og them in the service manual. trying to analyse a little about it: At J1 on the diagram Option 5/6 there is a dash over 5. Coild that mean option 5 if connected and option 6 is broken? However according to the Older MCL manual option 5 and is programable via remote. Could make sense if used without IR eye of course. But what does option tv on J4 mean then?
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