I have a B&O MLC 2 Expander that appears to have gone bad. I have 7 X-tra Speaker kits in a Master Control Link distribution system. Four of the remote speakers stopped working and the red status lights have gone out. I examined the MCL 2 Expander and there is a very hot to the touch scorch mark on the expander board. I have since unplugged the MCL 2 Expander. (See the attached photos). Does anyone know where I can locate "new old stock" or working used MCL 2 Expander kits? Does anyone know of a repair shop for these MCL 2 Expander boards? (I have BeoSystem 5500 components.)
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MCL 2 Expander: Repair or Replacement
5 replies
Hi and welcome to Beoworld!
Check with the seller but I think this is what you are looking for:
Location: Warwickshire, UK
My B&O Icons:
There is actually a circuit diagram for the MCL2E within the MCL Service Manual, available on this site for Silver and Gold Beoworld Members. The MCL2E is a bit more complicated that I first thought - the components must be on the other side of the board in your photo. Basically it just provides a fresh 9.3V power supply (pink wire) for the downstream MCL2As, and also amplifies the data signal (white wire).
Location: Warwickshire, UK
My B&O Icons:
Looking at the PCB drawing in the servicemanual the burnt spot could look like its above a diode. The diode could be shorted, but it could also have affected other components. The Diode is in the part of the circiut that amplifies the data signal
Location: Denmark
Thank you for responding to my question, Guy and Madskp. I may have gotten lucky. I found a new-old-stock MCL 2 Expander on eBay.
New questions come to mind (regarding newer MasterLink products) after researching the MCL2 expander and refreshing my memory on the X-tra speaker kit. I'll post a new question in the forum for the benefit of other members. Thank you again for your help.
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