Although I do not know all the answers I have to supply the solution to many problems without much help. I have been doing this type of work since 1982 as I am the Authorised warranty service agent for W.Australia with Shriro in Sydney being the Australian Agent for Casio. I was lucky to obtain all their old spares when they ran out of space to keep them and so have a large stock of the older Casio parts as I do not dispose of anything I might be able to use. If you require help I can try to be of service to you. Bernard Bloch.