Just a quick post. Having now restored the Juno 106 to working order, I've noticed several of the front panel tactile switches are rather intermittent. Unlike those on the MKS-30, these are of a standard and widely available design, so I'll replace them all.
The MKS-50 continues to annoy. Swapping the MN3101s had no effect and neither did changing the 4051 or the TL072 that feed them. Further probing reveals the power supply rails in the chorus area are significantly noisier than the rest of the synth. A close look at the board reveals that most of the bypass caps on the + and - 15V rails have the rubber bungs in their bases displaced. They are only rated for 16V, which really can't be a good idea on a 15V rail. In fact the whole construction of the synth is pretty poor. Roland really seem to have been penny pinching by 1987.
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