Casio CZ/ VZ/ FZ - Pro Series

Although I'm sad another one of these great synths has given up the ghost I'm glad I may have saved you some time troubleshooting the beast. Along with helping you out you've added to my knowledgebase for these synths. I had a Roland D-5 that was 4 ohms from 5 volts to ground accross the cpu. It even took out part of the power supply. You could try pulling the VCC leg of the D7811 and see if the voltage comes up and the D933 cools down but I doubt it will help. Then you would have to replace the cpu anyway. The uPD933AC is a tough chip to find any info on. Like you said a donor board is the only hope for replacement. I was able to use a CZ101 donor to fix a CZ5000 so they're all compatible except for the CZ-1.   

Josh, were only a few hours apart. Tonight I'm keeping warm here in the adirondacks. Check it out and tell me how the water is down at Qunincy Market. He,he... Fran 

--- In CZsynth@yahoogroups.com, joshua kampa <joshua@...> wrote:
>
> Thanks for the info.  The left D7811G is certainly hotter than the other,
> and i'm getting a solid 12Hz clock on pins 30 & 31.  Positive voltage
> (thought the chip would be on 5v but it seems VCC is more like 3.5V) on
> both chips on pins 25 & 28.  one of the D933AC chips (also on the left) is
> cooking pretty hot too... can't seem to find a datasheet for that one.  not
> a whole lot to be done, I suspect, without IC replacement.  Anyone have a
> 3000 (or possibly a 1000, as it seems that just one of the engines is
> toast, despite not getting any sound out whatsoever?) spare or donor
> mainboard?
> 
> Thanks again  for the solid info.  This group amazes me.
> 
> 
> Joshua Kampa
> 
> Arc-En-Ciel Custom Bicycle Studio
> joshua@...
> www.arc-en-cielstudio.com
> shop 617.666.6736
> mobile 612.747.5947
> 21A Union Square
> Somerville MA 02143
> 
> Producer, Bicycle Film Festival: Boston
> www.bicyclefilmfestival.com
> 
> 
> On Sat, Jan 14, 2012 at 10:14 AM, narfman96 <narfman96@...> wrote:
> 
> > **
> >
> >
> > I've had CZ voice chips go bad but the synth still played it was just
> > distorted. The clue was the NEC voice chip was warmer than any other chip
> > on the board. Maybe you could check to see if the uPD7811 CPU or another
> > TTL support chip is getting warm. Other than that you're going to have to
> > look for the clock signals on pins 30 and 31 and see if the CPU isn't being
> > interrupted (pin25) or in permanent reset mode (pin28). Sometimes if a
> > display fails it can cause this. I do not have the CZ3000 schematic but
> > looking at the CZ1000 and CZ5000 prints they are very similar.
> >
> > If you want to troubleshoot further you can contact me directly. I may or
> > may not be able to help... Fran
> >
> > --- In CZsynth@yahoogroups.com, "joshua" <joshua@> wrote:
> > >
> > > My CZ3000 just bit the dust mid playing- a weird glitchy mess was
> > followed by a sudden refusal to start up. Powers on, hum the phones,
> > nothing on the LCD and no response from any buttons. checked voltage out of
> > the PSU and that's good, all the cable connections are happy... could be
> > gremlins? I know other Casio Pro models had initialize or hard reset
> > buttons, but it seems this model lacks one. Any tips or tricks that anyone
> > has used for resurrection?
> > >
> > > thanks!
> > >
> > > joshua
> > >
> >
> >  
> >
> 
> 
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>