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The below cleaning guide is available as a printable document listed in the Documents section of this page.
- First, wipe away dust with a soft microfiber cloth.
- If needed, clean the sensors using a can of compressed air (“air duster”, found at any electronics store).
- If this does not resolve the issue, continue cleaning with a cotton swab lightly moistened with isopropyl alcohol – gently wipe the sensors with the swab. You can purchase isopropyl alcohol at most pharmacies or supermarkets.
Refer to the photos below showing the location of the Kolibri Domino sensors.
The sensors you will need to address are:
- Stacker Sensors – two sensors (Figure 1)
- Hopper Sensor – one sensor (Figures 2 and 3)
- Lower CIS Sensor – one sensor bar (Figures 4 and 6)
- UV Sensor – one sensor (Figures 4 and 5)
- Upper IR Sensor – one sensor bar (Figure 4, not shown in photos)
- Magnetic Sensors – 3 sensors (Figure 7)
Figure (1): Stacker Sensors (clear LED and black LED), located where money is stacked after sorting or counting
Figure (2): Hopper Sensor (black circular sensor in center), located at top of unit where bills are placed
Figure (3): Close-up of Hopper Sensor
Figure (4): Lower CIS Sensor and UV Sensor, located near front rollers and back plastic roller guides, respectively.
Upper IR Sensor is located directly above and facing the Lower CIS Sensor (not visible in photo)
Figure (5): UV Sensor, top view
Figure (6): CIS Sensor, back view with back panel opened
Figure (7): Magnetic Sensors
There are 3 main counterfeit detection techniques used in the majority of discriminators and detectors:
- MG – Magnetic Feature Detection – US currency uses specific magnetic ink at exact locations to provide a unique magnetic signature on each denomination note. By scanning each bill for the presence and location of these features, the Signature is capable of detection the minute magnetic signals present on these bills and will flag any notes that do not have these features present, in the correct locations. Certain counterfeit notes do not have the same features and will be rejected by the Signature as ‘SUSPECT’
- UV – Ultraviolet Feature Detection – Certain features are hidden to the naked eye on all US currency. In order to detect these features, the Signature has special ultraviolet emitters and sensors capable of detecting the exact ultraviolet anti-counterfeit features built into each denomination note. These are referenced against known-genuine currency and used to flag any notes that do not display the correct UV features on the suspect notes.
- IR – Infrared Feature Detection – Similar to UV, US currency contains hidden infrared features that can only be detected by infrared illumination and detection. The Signature scans each bill for the presence and accuracy of these features and fails any bills not meeting these criteria as ‘SUSPECT’.
Please visit https://kolibriusa.com/contact/ to create a ticket or call 1-877-898-8750 for support.
Kolibri suggests that the user cleans the unit at least once per week. For heavy use locations and operations, the user may clean the unit daily to avoid heavy buildup that may cause improper operation. When the unit is not in use, Kolibri suggests that the user covers the unit with a dust cover.
The feed gap is the actual height of the bill feed path, and should be tuned to just about the thickness of a single bill. If the feed gap is too wide, the user may experience a high amount of DOUBLE and CHAIN errors which are caused by more than one bill entering the scanning path at one time. If the feed gap is too tight, the unit may not be able to pass bills into the scanning path, or catch on bills and tear them.
For feed gap adjustment procedure, a printable document is available in the Documents section of this page. The following steps are the procedure for adjusting the feed gap:
- Ensure the machine is turned off.
- Position the rollers so that none of the light-colored rubber teeth are visible. This can be done by turning the kick rollers. Only the black smooth sections of the rollers should be showing.
Turn one of these rollers until only the black section shows on back roller
IIncorrect roller position
- Place one bill that is crisp and rigid enough to prevent bending during the adjustment procedure. Place it lengthwise either to the right or left side of the hopper. See below images for examples.
- Guide the bill between the inner rollers during this step; you should feel moderate resistance as you move the bill back and forth through these rollers. In other words, the gap between these rollers is wide enough to pass just one bill per count, but narrow enough to feel a slight tension or friction when pulling the bill out.
To adjust the bill feed gap, use the instructions below to turn the adjustment screw at the top of the unit:
- Make an 1/16’’ adjustment turn at a time, then retest.
- If the bill feels too loose, tighten the feed gap by turning the adjustment screw counterclockwise.
- If the resistance against the bill feels too strong, loosen the gap by turning the screws clockwise.
Important Note: The Kolibri Domino’s feed gap adjustment can be sensitive during adjustments. Do not overturn each adjustment or you may overshoot the optimum gap. We recommend testing with a stack of bills after each adjustment turn.
There are a few reasons that a detector may flag genuine currency as suspect. If bills are worn, bent, torn, or crumpled, the anti-counterfeit features needed to verify a bill as genuine may be compromised. For example, the magnetic ink on a note may wear over time or heavy use, reducing the magnetic response to below detection thresholds. If the Domino cannot verify the correct features expected on a note, the unit will flag that currency as ‘SUSPECT’.
If sensors are dirty or damaged, the Domino will not be able to detect the necessary anti-counterfeit features needed to verify currency as genuine.
Another possible reason is that the detection sensors may be incorrectly calibrated, lost reference, or be under operating conditions that cause false positives. In order to reduce these error types, it is advised to operate the unit out of direct sunlight and reduce interference that may cause sensor errors. If this occurs frequently under normal operation, please contact Kolibri support for troubleshooting or service.