Casio CZ/ VZ/ FZ - Pro Series

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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