Casio CZ/ VZ/ FZ - Pro Series

On Sat, 2011-06-18 at 10:00 +0000, lloydsmith1961 wrote:

>  
> It has gradually become slower & slower to switch on. The display
> shows a line of boxes & then after a while there's the click &
> characters/sounds appear. This  delay was initially intermittent -
> sometimes it would switch straight on.  Last night (isn't it always
> the way) about to use it for a studio project to find it wouldn't get
> beyond the grey box stage - no click, no characters, no sound & no
> buttons operational.  Have checked/tested the 3 AAA batteries which
> are all good. 

Sounds like a problem around the power-up reset circuitry.  I'm not sure
if there's a circuit diagram floating about but somewhere in there you
should find a resistor to +5V and a capacitor to ground.  As the
capacitor charges the reset pin goes from 0V to 5V.  Check for spillage
on the board around there, or signs of distress from the capacitor.

Note that this does not mean "blindly replace every capacitor you can
see in the hope this makes a vague problem go away".  That's the reason
I've had to scrap several synths people have brought round to get
fixed...

Gordon MM0YEQ