Low Battery Test; Troubleshooting - Casio SF-A7 Service Manual & Parts List

NO. OPERATION
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16

LOW BATTERY TEST

NO. OPERATION
ON
1
OFF
2

TROUBLESHOOTING

SYMPTOM
No power
No display or wrong display
DISPLAY
1TEL
4SEC 5TIME 6ALM
7MEMO 8CAL
MENU
DISPLAY
LOW BATTERY !
MENU
CAUSE
Battery shortage
Poor contact of battery terminals
Defective TAB-LSI
Poor contact SW1
Poor soldering of power supply circuit
Defective PCB unit
Defective TAB LSI
Defective heat seal
Defective LCD
Poor soldering of power supply circuit
— 6 —
2SCHD 3REM
VDD is 5.07V or below.
Replace batteries
Replace or polish them
Replace it
Replace it
Resolder them
Replace it
Replace it
Replace it
Replace it
Resolder it
NOTE
NOTE
SOLUTION