Casio CZ/ VZ/ FZ - Pro Series

>1. It doesn't want to run off batteries at all, only the AC adapter.

Possibly the battery contacts are corroded due to previous leakage.  Or a 
wire is broken.  It's impossible to tell exactly but it's unlikely that the 
problem is anything difficult to fix.

>2. The connection to the AC adapter (bought new from the Casio
>website) is very touchy and the power can cut in and out easily.

Either it's dirty or the solder joints are bad.

>3. Some of the programming buttons don't seem to work at all,
>specifically the ones for setting the volume envelope.

I'm not sure if the 101 uses silicone dome switches (which would just be 
dirty- it's very easy to clean) or tactile button switches (which would have 
to be replaced).  Tactile button switches require a bit more effort but it's 
still a simple procedure.

>Any thoughts how much it would cost to repair these things? My
>impression was it would probably cost almost as much (or perhaps more)
>to have it shipped and repaired at a shop, as I paid for it in the
>first place, and so maybe I should just buy another CZ instead?

No.  These are very likely to be extremely simple problems that can be fixed 
by anyone who can solder.

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