The VRs look okay. Just a little excess flux on the bottom. These trimmers
are hand-soldered after the rest of the board is complete, so they do not
look as nice as the other solder but they should work okay. IC 31 is ugly.
Remove it and remove the socket it is in, and any excess solder and wires
that were added in the original repair attempt. Put in a new socket and
start checking connections on the data lines (D0 - D7). You can use the
ohm-meter part of your multimeter to check connections from IC31 to all
other chips that it is supposed to connect to. I do not think there is any
way to test IC 24 and 26 with a multimeter. You would need an oscilloscope
to see what is going on. If you need to replace them, the standard part
number is 4011. Always put any new chips in a socket.
Maybe you should describe to us what kind of problems you hear right now.
The Q1 pictures are not focused, so I can't tell if it looks bad. If you
have problems with the LFO (MG) after everything else is fixed, it may need
to be replaced.
Don Backshall
_____
From:
PolySix@yahoogroups.com [mailto:
PolySix@yahoogroups.com] On Behalf Of
iorlovs
Sent: Thursday, April 11, 2013 5:35 AM
To:
PolySix@yahoogroups.comSubject: [PolySix] Please HELP Korg Polysix KLM367a Repair
I bought Korg polysix and want to replace ic31 chip and battery but i have
inspecting KLM 367a board and find bad things
Do i need to replace VR1 to VR 7? (under the board they are looking bad)
IC24 and IC 26 (HD14011BP) corrosion on the one of each legs,do i need to
replace them or just re-solder?
And GR is bad how i can see. (Q1 GR - K30A GR11) (under the board they are
looking bad)
Just want to know what i should replace and where i can find to buy all this
stuff if i need?
Maybe i can test all of them with multimeter?
Here is a pics of board
http://groups.yahoo.com/group/PolySix/photos/album/1588581670/pic/list[Non-text portions of this message have been removed]