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dead Korg DW8000
http://www.paia.com/talk/viewtopic.php?f=8&t=623
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Author:  Billb3 [ Sat Nov 29, 2014 11:17 am ]
Post subject:  dead Korg DW8000

recently acquired, the main CPU chip has its top blown off.

has anyone worked on one with extreme damage?

I am concerned that many chips my be fried.

Bill

Author:  toneman [ Mon Dec 01, 2014 9:15 pm ]
Post subject:  Re: dead Korg DW8000

>sounds like< power supply reversal or extreme! overvoltage.......ouch!

no traces burned? no diodes melted? no fuses blown?

:o

Author:  Billb3 [ Tue Dec 02, 2014 10:47 am ]
Post subject:  Re: dead Korg DW8000

only burns were right at the chips.

but no burned traces. p/s is fine after I replaced the 7805 #2.
no blown fuses
I'll check the diodes.

there was a hunk of metal loose in the case under the cpu board. I think if fell of the bottom of one of the keys.

Author:  Billb3 [ Mon Feb 09, 2015 3:47 pm ]
Post subject:  Re: dead Korg DW8000

I have removed the blown chips but now find that the board draws 1.4 amps on the first 5v line (whereas it should draw 700ma).

any suggestions on how to find which other chips are faulty.

Author:  toneman [ Tue Feb 10, 2015 5:13 pm ]
Post subject:  Re: dead Korg DW8000

still working on that dead korg, I see.
Give it a GOOD lookover with a large magnifying glass.
maybe there's still a solder blob from the explosions crossing some traces?
I use my index finger to feel the tops of the chips to see/feel if any are running
hotter that the others. Feel the traces also. Carefull, don't burn your pinky!!!!
Or, maybe one of those infared touchless temp probes?
if U itemize deductions, U could donate it to salvation army(?)
8-)

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