ZK S900 - User Manual

Questions and Answers

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Patricia WilsonAug 12, 2025
What to do if LCD displays “Please try again” on ZK S900?
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  Lisa WardAug 12, 2025
  If the LCD on your ZK Touch terminal displays “Please try again”, it could be due to a dirty or scratched fingerprint sensor, preventing a clear image. Clean the sensor with a moist tissue. Alternatively, the fingerprint sensor cable might be loose, or the sensor may need repair or replacement.
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Wendy WheelerAug 16, 2025
Why some users’ fingerprints sometimes can’t be verified on ZK Touch terminals?
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  adam87Aug 16, 2025
  If some users' fingerprints are not verified on ZK Touch terminals, the fingerprint quality may be poor. Try enrolling a different finger. You can also reduce the fingerprint “threshold” setting. If the fingerprints are completely unreadable, assign the user a PIN number instead.
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Charles RamosAug 20, 2025
How to fix ZK S900 Touch terminal unable to connect with PC?
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  vasquezrhondaAug 20, 2025
  If your ZK S900 Touch terminal can't connect to your PC, the connection may be loose. Check that the RS232/RS485 or Ethernet connections are secure. Also, ensure that network or firewall settings are not blocking communication to the S900.
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Regina DrakeAug 23, 2025
What to do if the fingerprint sensor light is off on ZK S900 Touch terminals?
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  Calvin AlvaradoAug 23, 2025
  If the fingerprint sensor light is off on your ZK Touch terminal, the fingerprint sensor or flat connection cable may be loose or broken. Unplug the cable from the fingerprint sensor and plug it back in again.
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Laura PettyAug 27, 2025
What to do if ZK S900 Touch terminal starts up, but cannot enter menu system?
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  steve66Aug 27, 2025
  If your ZK S900 Touch terminal starts up but cannot enter the menu system, the fingerprint sensor cable might be loose, the fingerprint sensor might be broken, or the circuit board might be broken. Remove the fingerprint sensor cable and plug it back in.
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Allison DuffyAug 31, 2025
How to fix time continually displays “00:00” after restarting ZK Touch terminals?
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  Leon NixonAug 31, 2025
  If the time continually displays “00:00” after restarting your ZK Touch terminal, the clock battery is likely drained. Replace the battery.
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Bernard ReedSep 3, 2025
How to fix pressing buttons no longer makes sound on ZK S900 Touch terminals?
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  andersoncatherineSep 4, 2025
  If pressing buttons no longer makes a sound on your ZK Touch terminal, there may be trouble in the buzzer, loudspeaker, or circuit board. Replace the buzzer and loudspeaker.
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Ashley TownsendSep 7, 2025
How to troubleshoot Power LED is off on ZK S900 Touch terminals?
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  Nicholas RogersSep 8, 2025
  If the Power LED is off on your ZK Touch terminal, it indicates no power or a lack of voltage. Check and examine the power and ground connections. Also, ensure 12V DC power.