[sdiy] K1 not saving patches

[WeAreAs1 at aol.com]

In a message dated 7/15/05 1:53:52 AM, sparked at zadzmo.org writes:

<< There's nothing obvious wrong with the board that I can see, and I just
replaced the backup battery (unsoldered the old one, put in a coin cell
holder instead, fresh cr2032.) >>

With the power off, check the voltage at the power supply pins of the static 
RAM chips (probably pin 24).  The voltage should be about 3 volts or so.  If 
you're not seeing 3 volts at that point, then work backwards from the RAM chips 
to the battery backup supply.  I know it sounds silly, but do make sure that 
you soldered the new battery holder in with the correct polarity.   Check the 
diode that's part of the backup supply.  Check all the solder connections in 
that circuit section, including all the pins of the RAM chip(s).  There's 
probably one other CMOS gate IC that's in that circuit section (a 4011 or 4001 or 
something like that) -- check it and its solder connections.  There's really 
not much else involved in that part of the circuit.  If, after you check all of 
these things, you're still having problems, you could call Kawai America's 
service department (if you're in the USA).  They may give you a bit of telephone 
tech support, but be considerate and try not to take up much of their time -- 
They're really there only to help authorized service centers.  Kawai:  
800-421-2177