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Casio SF-7900 Specifications Page 25
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TROUBLESHOOTING
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Key Matrix
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SF-7900(LX-522)
1
CONTENTS
2
SPECIFICATIONS
3
TO CHECK THE MEMORY CAPACITY
4
TO REPLACE THE BATTERY
4
ERROR MESSAGE
5
PARITY NONE
7
BIT LENGTH 7
7
BPS 9600
7
NOW SENDING !
9
TO STOP, PRESS ESC
9
LCD 96 × 64 dots
10
System chart
11
CIRCUIT EXPLANATIONS
11
Power supply circuit
12
6) Power supply for LCD
13
RAM pin descriptions
16
DIAGNOSTIC OPERATION
17
TROUBLESHOOTING
22
SCHEMATIC DIAGRAM
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Display PCB
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Key Matrix
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Key Matrix (Display side)
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PARTS LIST
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ASSEMBLY VIEW
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MA1100741A
30
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