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S900 starts up, but
cannot enter menu
system
Cause: Fingerprint sensor cable is loose.
Fingerprint sensor is broken. Circuit board
is broken.
Fix: Remove Fingerprint sensor cable and
plug back in
Time continually
displays “00:00” after
restarting
Cause: The clock battery is drained.
Fix: Replace battery.
The fingerprint sensor
light is off
Cause: Fingerprint sensor or flat connection
cable is loose or broken.
Fix: Unplug the cable from the fingerprint
sensor and plug it back in again.
Pressing buttons no
longer makes sound.
Cause: Trouble in the buzzer, loudspeaker or
circuit board.
Fix: Replace the buzzer and loudspeaker.
Some users’ finger-
prints sometimes
can’t be verified.
Cause: The fingerprint quality is poor.
Fix: If repeated attempts with the same finger
fail, use a different finger when enrolling.
Also reduce fingerprint “threshold” setting.
If user’s fingerprints are completely
unreadable, assign the user a PIN number
instead.
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