CASIO FX-9700GH Repair Manual

7. TROUBLESHOOTING
SYMPTOMCAUSESOLUTION
Clean or adjust pressure of
Intermittent displayDirt or poor contact on battery
contact
Clean or replace power
Poor contact on power switch
switch
Poor connection on PC joinerResolder or replace
Poor soldering on LSI, capacitor, or resistorResolder
No display at all Weak batteryReplace battery
Clean or adjust pressure of
Dirt or poor contact on battery
contact
Clean or replace power
Poor contact on power switch
switch
Poor connection on PC joinerResolder or replace
Defective LSI, capacitor, or resistor Replace
Erratic displayPoor contact between LCD and PCBReplace the heat seal
Resolder or replace display
Poor soldering on LSI
PCB ass'y
Certain key does notDirt on key contactClean or replace contact
function
Heavy key motionClean or replace the key
Poor soldering on LSIResolder
Defective LSI, capacitor, or resistor Replace
All keys do not functionConstant contact is made on a certain keySeparate the contact
Defective LSI, capacitor, or resistor Replace
Heavy key motionDirt or scratch on the keyClean or replace the key
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