Korg DW8000 Revival

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AlphaKeys88
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Korg DW8000 Revival

Post by AlphaKeys88 » Sat Sep 19, 2020 3:45 pm

Hello to all,

I'm attempting to restore a DW8000 I've had sitting in the closet for some time. I have minimal experience with repairing synths so I'm seeking help.

The problem: When powered on the LEDs blink for a second -- then about 2-3 seconds later there is an internal click sound. A few years ago I tried to replace the battery, but that didn't work. The other day I decided to take another shot at fixing it. This time going deeper into the boards and I discovered a burnt smell on KLM-663-1. There's a relay on that board (the click) so I suspect this could be the problem area. I checked the power voltage already and that seems ok.

I don't read circuit diagrams and I'm having trouble obtaining the resister values for testing. On the service manual I only see resister numbers. Where would I find the resister values?

Also should the ribbon cables just pop off? I applied a bit of force but they don't move. I don't want to yank them off and damage anything. Is there a technique to get them off safely?

Any information or guidance is appreciated.

A.

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Jabberwalky
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Re: Korg DW8000 Revival

Post by Jabberwalky » Sat Sep 19, 2020 4:02 pm

Did you search the forum. There have been a number of Dw8000 fixes and threads. I'd start there.

AlphaKeys88
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Re: Korg DW8000 Revival

Post by AlphaKeys88 » Sat Sep 19, 2020 6:17 pm

I have and couldn't find anything related. I'm still looking around and covering all the basics like power supply, fuse, etc.

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Re: Korg DW8000 Revival

Post by AlphaKeys88 » Sat Sep 19, 2020 8:15 pm

I tested out the resistors according to color codes. Below are my amateur readings.

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Those marked in black seem fine. R17 matched but the reading was very slow. R10 and R11 (100k) were also slow but didn't match. Is it normal for higher ohm resistors to read slowly?

Can a resistor burnout without having any apparent signs? Again I'm focused on this area because that's where it smells burnt.

Perhaps someone who knows this unit can identify what R10 and R11 are for.

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Re: Korg DW8000 Revival

Post by Ashe37 » Sat Sep 19, 2020 11:37 pm

keep in mind that when you try to read resistors in a circuit that it may not be reading the resistor, it may take another route through the circuit.

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