Hi again,
I found that I just don't find the time any soon to fix my Trident MK2.
Defects as described below. I won't find much time before August or even
later and I'm low of cash and my cheap studio monitors are signaling the
end of there life...
So in case anybody is interested in buying it, please make offers in €
off-list.
My offer includes:
- Korg Trident MK2 with defect named below, plus a scratch on the
wooden side. Besides that in good condition!
- Battery has been replaced
- Joystick has been replaced by other part
- 2x SSM 2044 NEW! but old stock
- 1x SSM SSM2056 used
- 2x 4066 quad CMOS switch
- 5x 4558 dual OpAmp
- Printouts of data sheets for all ICs named above.
- Printed service manual on A3 as available online
(however, not perfect quality)
- Custom made transport case in mint condition!!!
(wooden flight case with aluminum edges)
Sooner or later I'll put it on Ebay for a fixed price but I'd be happy
to avoid this extra work and just sell to some enthusiast here on he list.
I will arrange shipping within the EU, however I need to figure out
costs. (Outside the EU is not such a good idea because of customs etc.)
Payment could be done via PayPal or bank transaction.
Best,
Niels
Niels Ott schrieb:
> Hello there,
>
> my Trident MK2 is defective.
>
> Symptom: VCO 1 is defective for one voice.
>
> Up to now I was able to found out: Input 1 of IC704 (4x CMOS switch) on
> KLM-379 doesn't get the VCO signal on voice 7. On all others it does.
>
> There are some oddities with op amp IC707 but I'm not yet sure. The
> schematics and the circuit board design hint to the direction that IC707
> "feeds" IC704.
>
> The IC707 is a 4558, I assume that it is similar in the Polysix.
>
> Did anybody of you experience a similar problem? What about replacing
> the 4558, did this help?
>
> Furthermore, some of the 4558s carry a date stamp of 1997 which means
> they must have been replaced by an earlier owner.
>
> Unfortunately there is no shop selling electronic parts in reach so I
> can't just go for it and try replacing it. Mail order is an option but
> not for a few ICs...
>
> Thank you for commenting.
>
> Best,
>
> Niels
>
>