Diagnostic Operation - Casio SF-7900E Service Manual & Parts List

DIAGNOSTIC OPERATION

Main switch
SELF TEST PROG.
PRESS SET
QUIT BY OFF
CASIO 1993. 11. 09
MENU TOP SHEET
1 : DISP CHECK
2 : RAM TEST
3 : MEMORY TEST
4 : KEY / BUZZER
5 : INTERFACE
CASIO 1993. 11. 09
MENU DISPLAY
1 : LCD ALIGNING
2 : ALL DOTS ON
3 : ALTERNATIVE
4 : REVERSE
5 : LCD FRAMING
CASIO 1993. 11. 09
Check pad
1. Diagnostic mode
The diagnostic mode appears when main switch is turned on
while there is a short in the checkpad. After this operation,
the machine will beep and display "SELF-TEST".
The menu appears after pressing SET key. Tests are con-
ducted by selecting the mode from the list on screen. The
each test can be selected by numeral keys.
DISPLAY TEST : LCD display check
RAM TEST : RAM chip check
MEMORY TEST : ROM/Clock check
KEY/BUZZER : Keys and Buzzer check
INTERFACE : Transmission check
To return to the menu display, press DISP CHNG button .
2. Display check
LCD ALIGNING: Lights on dot at corners
ALL DOTS ON : Lights on in all dots (black screen)
ALTERNATIVE : Checker display
REVERSE : Reverse checker display
LCD FRAMING : Lights on dot along the screen edge (frame)
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