7. TROUBLESHOOTING
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Power Supply
PROBLEM POSSIBLE CAUSES
Nothing appears on the display when power is turned on.
1.The battery switch on the back of the unit is set to REPLACE
BATTERIES.
2.Battery power is low.
3.Display contrast is too light.
The BN Unit does not operate normally after batteries are replaced.
Problem with BN Unit operational settings.
RECOMMENDED ACTIONS
1.Slide the battery switch to NOR-
MAL OPERATION.
2.Replace batteries (page 18).
3.Adjust display contrast (page
10).
Perform the following procedure.
1.Slide the battery switch to the
REPLACE BATTERIES position, and remove the battery compartment cover.
2.Use a thin, pointed object to press the P button inside the battery compartment.
3.Replace the battery compartment cover, and slide the battery switch back to NORMAL
OPERATION.
4.Use a thin, pointed object to press the RESET button on the back of the unit. See “To reset the BN Unit” for details on the reset procedure.
5.After adjusting the display contrast and confirming that a message is visible on the screen, press ESC to clear the message.
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Display Contrast
Display is totally black.
Display contrast is too dark.
Adjust display contrast (page 10).
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Operation
Nothing happens when keys are pressed.
1.Battery power is low.
2.Exposure of the BN Unit to some external condition is interfering with proper operation.
Power suddenly turns off or contrast adjustment screen suddenly appears.
Battery power is low.
1.Replace batteries (page 18).
2.Press the P button and then the
RESET button. See procedure above.
Replace batteries (page 18).
• If any of the above does not restore your BN Unit to normal operation, contact your nearest
CASIO dealer for servicing.
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