goldear
Certifiable Audio Junkie
If your going to trace the problem down to its root cause, then you really need to get a service manual, and trace the proablem down with an oscilloscope.
But, even if you do this, and you identify, and replace the affending part, I guarantee you that you are going to find other caps will be going out not very long after you replace todays bad capacitor. Yes there are a LOT of caps in there, so this is no trivial job. However, if you go to all this effort, then at least you shouldn't be having any more capacitor failures for another 20+ years. The TC-854 is a nice enough machine that it is genuinely worth this kind of fuss. Not all that many others are IMHO.
But, even if you do this, and you identify, and replace the affending part, I guarantee you that you are going to find other caps will be going out not very long after you replace todays bad capacitor. Yes there are a LOT of caps in there, so this is no trivial job. However, if you go to all this effort, then at least you shouldn't be having any more capacitor failures for another 20+ years. The TC-854 is a nice enough machine that it is genuinely worth this kind of fuss. Not all that many others are IMHO.