Download Casio SF-7900 Specifications

CONTENTS
SPECIFICATIONS ................................................................................................................ 1
TO REPLACE THE BATTERY ............................................................................................. 2
TO CHECK THE MEMORY CAPACITY ............................................................................... 2
ERROR MESSAGE ............................................................................................................... 3
TO RESET THE SF UNIT'S MEMORY ................................................................................. 4
TO SAVE THE DATA TO ANOTHER UNIT ......................................................................... 5
BLOCK DIAGRAM ................................................................................................................ 8
CIRCUIT EXPLANATIONS
System chart................................................................................................................. 9
Power supply circuit .................................................................................................. 10
CPU pin description (HD62076C03).......................................................................... 12
Gate array pin descriptions (SSC2571F0A) ............................................................. 13
Operation program ROM pin descriptions .............................................................. 14
RAM pin descriptions ................................................................................................ 14
DIAGNOSTIC OPERATION ................................................................................................ 15
TROUBLESHOOTING ........................................................................................................ 20
SCHEMATIC DIAGRAM
Main PCB .................................................................................................................... 21
Display PCB ................................................................................................................ 22
Key Matrix ................................................................................................................... 23
Key Matrix (Display side)........................................................................................... 24
PARTS LIST ........................................................................................................................ 25
ASSEMBLY VIEW .............................................................................................................. 27