Archive of the former Yahoo!Groups mailing list: Yamaha CS80

hi folks, i know its not an 80 question, its a CS-5 question, but hey, peripherally related maybe? im working on one of these and im wondering if anyone knows the behavior of this chip, and whether what im seeing is right.

the power pins read correct voltage. pin 39, the CV out pin, seems to respond properly to the keyboard manual. however, pins 2-19 virtually all read -7.5V. is this proper?

the problem im having is that the pitch of the VCO does not respond to the keyboard. gate opens/closes properly, but the pitch of the VCO is a constant pitch that directly relates to the LFO rate. so w/ LFO at max, i get about a 20hz pitch, regardless of which key is depressed. trying to trace downstream from the keyboard output. thanks for any leads-rj





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