Troubleshooting - Casio BN-10 Service Manual & Parts List

7. TROUBLESHOOTING

Power Supply
PROBLEM
Nothing appears on the display
when power is turned on.
The BN Unit does not operate
normally after batteries are re-
placed.
Display Contrast
Display is totally black.
Operation
Nothing happens when keys
are pressed.
Power suddenly turns off or
contrast adjustment screen
suddenly appears.
POSSIBLE CAUSES
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.
Problem with BN Unit operational
settings.
Display contrast is too dark.
1.Battery power is low.
2.Exposure of the BN Unit to
some external condition is inter-
fering with proper operation.
Battery power is low.
— 40 —
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 posi-
tion, 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 compart-
ment cover, and slide the bat-
tery 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 con-
trast and confirming that a mes-
sage is visible on the screen,
press ESC to clear the mes-
sage.
Adjust display contrast (page 10).
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 re-
store your BN Unit to normal
operation, contact your nearest
CASIO dealer for servicing.