Korg Forums

justcall.zipt · Joined: 16 May 2017 Posts: 6

I have a Kronos 1st Gen and the PROG or Program button is not functioning right. When I press PROG it goes to GLOBAL for some reason. I checked the inside of the Kronos and no indication of any physical damage. I even resoldered and interchange the tact switch and still resulting to the same issue.

Can any body help or suggest what to do? I have upgraded also and no luck.

See video to see whats going on:
https://www.youtube.com/watch?v=rXaaVX79uv8

GregC · Posted: Wed May 17, 2017 2:13 am Post subject:

what a miserable problem.

Did you power down and duplicate it ?

I think you have to bring it in for service. Appears to be a faulty button/connection.

do you have history with this Kronos ? if so, did the problem just occur ?
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justcall.zipt · Joined: 16 May 2017 Posts: 6

Thank you for replying GregC.

I even have updated the software up to 3.1.2 and same result and it is frustrating.

I haven't used this for a while (about 2years) and then when I am trying it now this happened. This is just in the room all throughout those 2 years.

Liviou2004 · Posted: Wed May 17, 2017 7:42 am Post subject:

Hello,

Or it is a software issue, or a hardware one.
If a soft issue, perhaps you could try to reload your factory configuration (with the first system) and see what appens.
If it doesn't work, the button will have to be replaced.

GregC · Posted: Wed May 17, 2017 12:27 pm Post subject:

KK · Platinum Member Joined: 13 Oct 2016 Posts: 1422

Hi justcall.zipt,

For example, if the Kronos was stored vertically on one side during storage, once you replace it horizontally it could loosen a connector inside. Could also be a tiny bit of oxidation, etc. I would check/move all connectors to the faulty button PCB to see if it helps.

aron · Posted: Wed May 17, 2017 6:30 pm Post subject:

Yeah, probably hardware. My SY99 is completely screwed up - all the buttons are intermittent from storing it on the wall.
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spaceman3 · Platinum Member Joined: 25 Jan 2015 Posts: 520

I dont know if what im about to say is what is wrong in this case.
I had a KORG KARMA that after about ten years, pad 1 was not working right.
Sometimes it wouldnt trigger, and sometimes it would trigger pad 4.

Sprayed one shot of DeoxIt D5 into the pad.
Pressed the pad about 40 times.
Turned the synth back on and the pad was fixed.

Geoff Flynn · Full Member Joined: 04 Jun 2016 Posts: 145

KK · Platinum Member Joined: 13 Oct 2016 Posts: 1422

On the video, you can also see that the short or ground feedback goes through the Bank I-A switch. Check all wires and connectors going to the KLM-3004 PCB. I would also shoot it thoroughly with pressured air to remove any dirt that could be causing the problem. If you are lucky, it's just that. Contact cleaner is a good idea too.

justcall.zipt · Joined: 16 May 2017 Posts: 6

Hi everybody... thank you for replying as it gave me some idea.

Liviou2004= I h ave tried loading the factory configuration by following this: https://www.youtube.com/watch?v=RcGYbmyPksY and no luck...

GregC= im thinking about bringing it to service... just hesitant as it takes a long time here in the Philippines...

KK= it was stored horizontally... I guess I need to check the inside again and look more carefully for anything...

aron/spaceman3/Geoff Flynn= I havent tried spraying with contact cleaner... I will do just that this weekend...

KK= thats a good observation... I will thoroughly check the PCB board... is the KLM-3004 PCB the board for the MODE BUTTONS?

Liviou2004 · Posted: Thu May 18, 2017 6:15 am Post subject:

justcall.zipt · Joined: 16 May 2017 Posts: 6

Liviou2004= I misplaced the CDs... thats one more thing I havent done since I dont have the CDs anymore.

geoelectro · Posted: Thu May 18, 2017 12:26 pm Post subject:

My thoughts on this is there is a short on the button board. It could be a shorted diode or it could be some foreign material has gotten on the board and damaged it.

The buttons are scanned in groups. There is a diode for each button to provide isolation since certain scanning signals are shared. If a diode shorts, then it would electrically combine buttons together.

The same result could come from a short on the board across traces. This could happen from some foreign matter getting on the board that has the ability to corrode. This could be a liquid for example.

I don't recommend using contact cleaner. The buttons are making contact and it's very hard to get cleaner inside the tact switches without getting it all over everything else.

I would take it into a shop unless you're handy with disassembly and using a meter to looks for shorts etc.

Geo
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justcall.zipt · Joined: 16 May 2017 Posts: 6

Hi everybody,

I was able to open up my Kronos and have a thorough inspection. There was a short on the PCB.

Before

(black spots... center portion of the board)

Turns out the shorted circuit was GLOBAL and not PROG.

I cleaned the board with contact spray and cotton bud to remove the black stuff off the short circuit.

After letting it dry and using a hair blower to make sure all moisture is gone before putting it all back.

After

Thank you for all your suggestion. Everybody was so helpful in getting this solved.

Big thank you to everybody.

Cheers!!!