Archive of the former Yahoo!Groups mailing list: Discussion about the Korg PolySix synthesizer

It almost beings to sound like the RAM chip went bad. I've encountered
'367s with dead RAM before. If you can, using a voltmeter check the power
pins of the RAM chip (pins 9 and 18) with the power on and then with the
power off. On, it should read around 4.5 volts. Off, it should read
around 2.5 to 3 volts, depending on battery type. I've seen where the
pins of a 5514 sram chip corrode, or worse, the corrosion enters the chip
body through the metal of one of more pins and eats the metal of the pin
away inside the chip even though the pin looks good.

Another test is to load a set of voices from a tape or wav file into the
P6, then do a verify on the same tape/wav file to see if things got
scrambled when trying to store. Other possible problems are the 4011
(IC25) that controls the write access to the ramchip, or a dead/overloaded
bus buffer (IC30/IC31).

Crow
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