TR-606 switch question

[Byron G. Jacquot]

>Sitting here staring at my lobotomized 606 some more, I notice that 
>main volume control VR8 (missing) has an integral switch, which I 
>assume is the unlabeled switch in the power supply. Also, there are 
>four mounting holes for the pot, all of which are part of the ground 
>plane on top but are isolated on the bottom. I assume that I need to 
>jumper these four pads to ground as the holes aren't plated through.
>Now that I look at it some more, VR1 (also missing) appears to have 
>the same sort of thing going on with the mounting holes.

Without opening my 606 up, my guess is that those extra holes are for some
sort of extra frame that holds the pot to the board.  Many board mount pots
have some extra flanges to help secure them to the board, so that the
electrical connections aren't the only ones holding it down.  If those pads
don't run have traces leading anywhere else, this is probably the case.

And you're right, the switch in the volume pot is the power switch.  Just
like a car stereo, if you turn the volume all the way down, it'll cleck, and
you'll have switched it off.

>Have I got this right? Does anyone know what the nominal voltage for 
>the AC adapter is (thought I saw 9V somewhere)?

9V is right.  I think it's the same adapter that Roland used for most of
their battery powered gear (pedals and the like) at that time.

Byron Jacquot