The TX-2 turntable includes the MMC5 cartridge and is in good shape with the exception of the right channel output. It is muted at least 12 db compared to the left channel during play EXCEPT for the instant before the stylus is lifted from the record by the turn or lift keys. At the instant the tonearm begins to lift the right channel loudness increases to equal the left. This isn't a result of  tracking force or cartridge compliance, because the output does not increase if the arm is lifted from the record by hand or if the tracking force is adjusted to near zero tracking. The stylus and cantilever appear to be fine and tracking angle is near 20 degrees at 1.25 grams force. The muting function works perfectly. I have no electronic test equipment to trace this down. Has anyone experience this problem before who can point out what to look for?

 Thanks, Jim.

It could be the cartridge - do you have another one, or can you borrow a known good one to test on your deck?

The pins sometimes lose internal contact with the coils in the cartridge body. Unfortunately there isn't a lot you can do if this is the case.

Chris.

Thanks fellas, after several hours of fiddling with it I think I can agree it may be the mute switch, at least I hope so. Finding another working MMC cartridge isn't easy or cheap. I do have a spare RX deck I can try my MMC5 in. If that works I'll see if the RX has the same mute switch inside. Thanks again!

 Jim

Seems as though this may be a common problem, my 5005 is having the same problem ( except it is the left channel that's low ). 

Are parts for these older machines still supported by B & O, or have they decided their obsolescence by no longer supplying parts ? 

I'm a tad isolated living in Tasmania, Australia ( no jokes you mainlanders ! ) so any assistance in locating one of these switches would be appreciated.

i'd appreciate knowing which wire to put where when bypassing the switch. 

Thanks in advance and all the best for the Festive Season.