Casio CZ/ VZ/ FZ - Pro Series

> It's not as straight-forward as it sounds.  
 Hi Everybody,
 Actually is it simple and straight forward. Simply connect a
9 volt battery strap to the + and - battey terminals. Connect 
a square battery holder for 4 AA. Stuff the back of the CZ
battery compartment with foam. Snap in the battery holder and
your done. Should hold the memories for at least 9 months 
without use. Mine did. The CZ 3000/5000 use 3 AA's for backup.
 I tried with 3 volts or 2 AA's but this did not hold memory.
It did work with 4.5 volts or 3 AA's, but there is no way to
mount the 3 battery holders, so I went with four or 6 volts
backup.
 So why does this work? The casio already works with battey 
backup in the form of 9 volts via 6 D cells. Built into this
circuit is a low voltage memory protect that will shut down 
the CZ when the voltage drops below a certain threshold.
Usually set at around 7.5 volts or so via an internal trimmer.
By placing only 6 volts here the CZ will not try to run off the 
batteries. If you instead placed a 9 volt type battery on the
clips, as per a mod article in Electronic Musician, the CZ
will actually run off of this battery. The poor 9 volt will last
about 5 minuts before the low voltage protect shuts it off, 
leaving the battery dead and useless. So 6 volts no problem.
 So why does the CZ cause such problems with batteries in the first
place? Another mystery that plagues many CZ users is the power jack
on the side of the CZ 101, 1000, 230S. The pin is not a standard
one as many believe. The center pin is actually 1.7mm and not the
standard 2.1mm found in many replacement power supplies. So the will
work sporadicly, giving the impression that the jack is faulty. This
condition is probably the leading cause of short battery life. The CZ
user does not reralize the power has disconnected momenarly and 
running off the internal battery backup. The ^ D cell normally only
last around 4-5 hours tops. So using 6 volts as back up eliminates 
this power problem, as now when the power is interupted the CZ will
shut off, saving the backup not draning it.
 And the proper fix for the power is to get the correct AD-5 supply
for a Casio with the 1.7mm center pin. ( Don't get the barrel end 
type that has a "L" shaped end as this will not seat property in the 
101. Get the one with a straight end.)
 Also the CZ101/1000/230S does have a super capacitor to hold the 
memory for battery changes. Depending on the condition of the cap
this will hold for at least 5-7 minuts without any battery. Just
look at the schematics.
 I'll post a pic of the required items if I can. All you need is 
a 9V battery clip, a 4 AA battery holder, and some foar rubber to 
stuff the battery compartment. Simple!

Terry (The Casio Kid)