Casio CZ/ VZ/ FZ - Pro Series

I don't think this can be caused by CMOS chips.

Bigger problems with long time sleeping instruments can be caused by  
old capacitors, mainly electrolytic ones.

Repeating switching on/off can't help so much, important on it is the  
phase when machine is on. Because it was enough time off :-)

So what can help is to leave the machine on for longer time, but to  
watch it (danger of the fire!).

And the best is to check all caps and maybe change electrolytic caps  
looking suspiciously in PSU (or elsewhere in the circuits).

When PSU delivers stable voltages properly on spec, it's time to check  
all the other things - first all connectors and chips in sockets, as  
this is where oxidation can cause bad contact. Clean, de-oxit, reseat  
more times...

If this all doesn't help to revive the machine, it's necessary to do  
other checking and  diagnostics, and maybe replace more components.

Problems can be also solved by changing RAM backup battery (and  
leaving the machine without battery for 24 hours), by factory reset,  
by loading good set of sounds, and of course by using the machine (for  
example problematic microswitches can return  to normal operation when  
used for some time - something like self-cleaning).

Just my experience from reviving of many old machines. It's not rocket  
science.

Daniel Forro


On Jul 16, 2016, at 9:18 AM, bill bigrig billbigrig@...  
[CZsynth] wrote:

> I'm going to go out on a limb here, I've had Sequential Circuits,  
> Yamaha Cx5 muzik computer and yes, CZ act weird on me after long  
> rests in a closet etc. They act REALLY weird on power up. I turn  
> them off for a day, then back on. Repeating this brings them back a  
> little bit at a time. The only thing I can think of is the Cmos  
> electronics of this era wakes up slowly. It has happened to me MANY  
> times. You may want to try it.