Circuit Overview:
An organization of 2- DK70 architectures, save they only used 6 voices per chipset! Makes one wonder...but SSM2031 HFO supplies signal to M112B1 sound chips which creates all waveforms to be modified through SSM2045 combo chip controlled by the digital interface. There are two channels of this operation on the DK-80 and it gets a 'Bi-timbral" label. An interesting synth capable of some fairly cool sounds that have enough analog character to make it worthwhile and enough digital complexity to make it different from most.
Service Tips:
Mine had some power supply issues. Blown diodes...can't recall what else. I installed a standard AC cord socket and transformer on mine since it didn't come with a supply. Barely fit but makes the thing a little more portable. Now if I can just find a decent key movement for it :). Ohhh never mind. I got a scrap DK600 in so I busted off three of the key bushings and plastic welded the pieces on to the messed up DK80 movement, and warped the metal and got it all straight again. hehe. So it's whole once more. On the DK70 which is Identical in many ways I've seen the M112B1 fail and also the op amp that buffers the DAC output.
Parts:
I have found a source for the M112B1 that isn't 100 dollar minimum if maintains his stock. Ask. A guy is making cards for them now and see Sander's site for that info.
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