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1. UV Sensor
2. IR Sensors
3. Magnetic Sensors
Note: that several factors can cause a KCD-2000 to not recognize a genuine bill:
- Overly wrinkled, overly creased and overly worn bills.
- If the unit is dropped or bumped.
- A sudden change in temperature
- Extended period of non-use
- Improper maintenance or lack of preventative maintenance/cleaning
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