Ah, scratch that. Different -15/+15V supply. Anyway; the Trouble Shooting Guide in the service manual gives the following procedure: "5. No voltage is put out for -15V. Other voltage positions operate correctly." "Probably cause: Tr21 - Tr20 - 0.22ohms.1P" The service manual is here: http://manuals.fdiskc.com/tree/Yamaha/
Message
Re: [vintagesynthrepair] CS-70m power supply issue, -15V rail is dead
2013-07-20 by Malte Rogacki