Trident battery question

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zingo
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Location: Sweden

Trident battery question

Post by zingo » Tue Jan 27, 2009 11:28 pm

Hello - I have a hopefully simple question: has anyone replaced the battery in a Korg Mk I Trident? The reason I'm asking is that I recently bought and repaired a Polysix with battery corrosion and then read that the Trident also uses a similar NiCd battery that should be changed. However, I can't find anything resembling the old Polysix NiCd in my Trident. Does it only apply to the Mk II version? Any help would be welcome.
Regards, Olof

Europe Endless
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Re: Trident battery question

Post by Europe Endless » Thu Jan 29, 2009 9:28 pm

If you can wait until monday next week, I´ll pop the hood open on my MkI and have a look. I just bought the Trident and was thinking of replacing the battery myself!

zingo
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Posts: 23
Joined: Sun Oct 02, 2005 12:06 am
Gear: Poly6 Trident JX8P JX3P Juno6 JP-4 Promars D50 CS15D MKS20 MKS50 Matrix-1k K3m K5kS K5m EX5R SY22 ASR-10 ESQ1 S6k DSS-1 Poly-800
Location: Sweden

Re: Trident battery question

Post by zingo » Mon Feb 02, 2009 9:56 pm

Hello - no problem, any help would be welcome. If you find something that should be changed then I'd be grateful for the information. At the moment I suspect that the "NiCd similar to Polysix" specifically applies to the Mk II version, but then the Mk I has to have some kind of backup battery as well.

Europe Endless
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Posts: 14
Joined: Thu Jul 05, 2007 8:20 pm
Gear: Minimoog model D, Prophet 5 3.3, MultiTrak, Juno-60, 3xPolysix, Trident MkI & MkII, DW8000, DX7IIFD, KX88, and DIY Digisound SSM-based mono.
Location: Way north

Re: Trident battery question

Post by Europe Endless » Sat Feb 21, 2009 3:38 pm

Problem solved!
The battery is located on the KLM-292 (the largest board on the front panel) Unfortunately you have to remove the entire board from the panel, desoldering the five power connections.
Remove the old battery and put in a battery holder for a CR2032 coin cell instead. Replace R26 with a diode, cathode facing D9 (eg 1N4148) and remove C21. Remount the board and you´re set to go!

I took the opportunity to replace all the electrolytic caps and all four CMOS 4051, since I know from reparing Polysixes that they´ll fail sooner or later...

zingo
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Posts: 23
Joined: Sun Oct 02, 2005 12:06 am
Gear: Poly6 Trident JX8P JX3P Juno6 JP-4 Promars D50 CS15D MKS20 MKS50 Matrix-1k K3m K5kS K5m EX5R SY22 ASR-10 ESQ1 S6k DSS-1 Poly-800
Location: Sweden

Re: Trident battery question

Post by zingo » Mon Feb 23, 2009 10:27 pm

Thank you! Sounds like the procedure is very similar to that for the Polysix then. I'll open up the hood again sometime later this week and have a go with the soldering iron. Thanks again.

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