--- In
PolySix@yahoogroups.com, "backshall1" <backshall1@...> wrote:
>
> 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.com
> Subject: [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]
>
HI!
I have putted new socket and new ic31 chip,and repaired all bad tracks and cleaned klm 367a with isopropyl spray called Kontakt IPA. So now program buttons working correctly but its still weird sound from synth. I don't know what should i check now,where can be a problem?Maybe someone have detailed schemes of synth (I have Service manual) or someone know how to check boards for troubleshooting or maybe know weak places of Korg Polysix to tests them.There is a TEST switch on the KLM 367a, what is that,i can test the board with this switch?From where i should start and how to test?
Thanks a lot!