Archive of the former Yahoo!Groups mailing list: Yamaha CS80

Latest update (I'd been waiting for some more parts):

Power Supply (pics under Photos > CS80 renovation > Power Supply):
I replaced all the bypass caps on the power supply circuit board. As
some of you know (especially if you've read Crow's site), the big
electrolytic caps dry out after many years and stop doing their job,
which is to smooth out the voltage.

I used parts with at least the same capacitance value (in general,
more is better) and voltage value. The catch is that the size of caps
have changed over the years. It's not just micro-chips that have
gotten smaller (see pic "caps are smaller now!" to see new/old caps
next to each other). In fact, the old 5600uF caps had a third lead,
which wasn't electrically connected, just to support it on the board.
This made mounting the biggest one a little tricky.

My wife didn't appreciate that the old, lavender-colored caps have
been replaced by ugly black, grey, and brown ones. Oh well.


TKC (pics under Photos > CS80 renovation > TKC):
This board was 100% old CMOS digital chips with no bypass caps! I
definitely needed the desoldering station for this one. It's also
tricky, since there are about 12 types of chips on this board, which
all look virtually the same. In addition, they all face one way,
except about four of them! If you look at "Back - after with caps",
you'll see why Crow was smart to use the sockets with the built-in
bypass caps.

I think the only board I have left is the KAS. I should have my
de-soldering station for sale in a couple of weeks!

David