Casio SF-7900E Service Manual & Parts List

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
Gate array pin descriptions (SSC2571F0B) ............................................................. 14
Operation program ROM pin descriptions .............................................................. 15
RAM pin descriptions ................................................................................................ 15
DIAGNOSTIC OPERATION................................................................................................ 16
TROUBLESHOOTING ........................................................................................................ 21
SCHEMATIC DIAGRAM
Main PCB .................................................................................................................... 23
Display PCB................................................................................................................ 25
Key Matrix ................................................................................................................... 26
Key Matrix (Display side)........................................................................................... 27
PARTS LIST........................................................................................................................ 29
ASSEMBLY VIEW .............................................................................................................. 31

Casio SF-7900E Specifications

General

Brand	Casio
Model	SF-7900E
Category	Organizer
Language	English