Casio CZ/VZ Files... part of CZsynth

Hello all,

I see that there are copies of the CZ-1 Operator Manual on the web but no where can I find the service manual. If anyone has a copy or knows where I might download one, I would be very grateful. My CZ-1 is sick with a weak and varying output volume. So far no simple reason can be found. I need a service manual to delve further into it's guts.

Thanks,

Gary D.