Casio SF-7900 Specifications download pdf (Page 2)

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

1 2 3 4 5 6 7 ... 29 30

No comments

Casio SF-7900 Specifications Page 2