User's Manual

B -Maintenance and Troubleshooting  65
Proprietary
B Maintenance and Troubleshooting
B.1 Cleaning the Fingerprint Sensor
The Fingerprint Sensor is a rugged optical device designed to provide years of trouble-free
service. Although the sensor has few maintenance and handling requirements, basic
precautions in caring for the sensor will help ensure the best performance over the life of the
sensor.
Oily deposits from the user’s fingers can accumulate on the surface of the sensor after repeated
uses of the device. These oily deposits may affect the functionality of the sensor. Cogent
recommends that the sensor is cleaned once a week or whenever a noticeable accumulation
occurs.
The manufacturer of the sensor recommends using rubbing alcohol to clean the sensor surface.
The rubbing alcohol will not damage the sensor or reduce the life expectancy of the sensor.
Rubbing alcohol is preferred for its ability to dissolve the oily residue, and it evaporates quickly
without leaving a residue of its own on the sensor.
WARNING: Do not use nylon brushes, scouring pads, or abrasive cleansers even if they contain
rubbing alcohol, powder cleaners, or steel wool. Using any of these types of cleaners on the
sensor will damage the protective qualities of the sensor against electrostatic discharge. They
may damage the sensor’s ability to capture a high quality image of the fingerprint and will
void the warranty of the sensor.
Apply enough rubbing alcohol to saturate a clean, lint-free, soft cloth or tissue paper. Wipe the
fingerprint sensor in a downward motion. This will remove the oily deposits and prevent any
scratching on the surface of the sensor.
WARNING: Do not allow alcohol to pool along the edges of the sensor.
B.2 Caring for the Fingerprint Sensor
The fingerprint sensor is designed to perform well even under harsh operating conditions. As
with all optical devices, some precautions should be taken to avoid damaging the sensor.
• Do not place the fingerprint sensor close to any heat source that would cause the unit to
exceed its standard operating temperatures.
• Do not subject the sensor to shocks or vibrations.
• Do not allow any pointed objects to scratch the surface of the sensor.
• Do not allow any metal to contact the sensor surface.