Bill Counter Maintenance & Troubleshooting Guide — Error Codes and Fixes

A bill counter is a precision instrument. It relies on an array of optical, magnetic, and mechanical components working in synchronization at speeds of up to 1,500 notes per minute. Without proper maintenance, even the best bill counter will degrade—dust accumulation on sensors causes false counterfeit alerts, worn rubber parts cause feeding errors, and miscalibrated CIS modules cause denomination misreads.

This guide covers everything you need to know to keep your machine accurate and reliable over years of daily use. We cover maintenance schedules, sensor cleaning procedures, hopper adjustment, a complete error code reference table, CIS calibration, and when to replace wear components.

1. Maintenance Schedule: Daily, Weekly, Monthly

Consistent maintenance extends the life of your machine from 3–5 years to 10+ years. Follow this schedule based on usage volume. For high-volume operations (5,000+ notes/day), increase the frequency of each task.

Daily (end of each shift)

• Power off and unplug the machine before any cleaning.
• Use a soft-bristled brush (the one included with your FEELTECK machine) to sweep dust and paper debris from the hopper area, transport path, and stacker tray.
• Wipe the exterior with a dry microfiber cloth. Avoid solvents or spray cleaners near the machine housing.
• Visually inspect the hopper tray for jammed notes or foreign objects (coins, paper clips, rubber bands).

Weekly (every 40–50 operating hours)

• Clean all sensors using the procedure in Section 2 below. This is the single most important maintenance task for counting accuracy.
• Inspect the rubber feed rollers and friction pads for glazing (shiny surface), cracking, or debris buildup. Glazed rollers slip and cause double-feed errors.
• Check that the hopper guide plate moves freely and returns to position under spring tension.

Monthly

• Perform a full CIS calibration (see Section 5). Recalibration is essential after any sensor cleaning or transport-path disassembly.
• Test the machine with a known batch of notes—count a pre-verified stack of 100 notes and confirm the machine reports 100. If it miscounts, check sensors and hopper adjustment first.
• Inspect the power cord for fraying, and confirm the power switch operates cleanly.
• Apply one drop of light machine oil to the drive shaft bearings if your model has accessible lubrication points. Most FEELTECK models use sealed bearings and do not require oiling—check your user manual.

2. How to Clean UV, MG, IR, and CIS Sensors

The sensor array is what determines counting accuracy and counterfeit detection reliability. Paper dust, lint, and environmental particulates settle on sensor lenses and degrade performance over time. Here is the correct cleaning procedure for each sensor type:

• UV (Ultraviolet) sensors: Located near the top of the transport path. Use the included soft brush or a lint-free cloth to gently wipe the UV lamp housing and the corresponding receiver lens. Do not use alcohol or solvent on UV lamps—they can cloud the quartz glass.
• MG (Magnetic) sensors: Typically a small magnetic head (similar to a tape deck head) that contacts or hovers near the bill surface. Dust the MG head with a dry brush. If metallic particles accumulate, use a cotton swab barely moistened with isopropyl alcohol (99% concentration) and wipe in a single direction. Allow to dry completely before powering on.
• IR (Infrared) sensors: Usually paired emitter-receiver modules across the transport path. Brush both the emitter and receiver lenses. IR sensors are sensitive to dust because infrared light scatters on particles, producing false readings.
• CIS (Contact Image Sensor): The glass scanning surface of the CIS module must be perfectly clean. Open the transport cover fully, locate the CIS glass bar (a narrow strip across the bill path), and clean it with a lint-free microfiber cloth. One speck of dust on the CIS glass can produce an image artifact that triggers an E10 or E15 error.

3. How to Adjust Hopper Tightness

Hopper adjustment is the most common fix for feed-related errors (E2, E3). The hopper screw controls the gap through which notes enter the transport path. Too tight, and notes jam or fail to feed. Too loose, and multiple notes slip through together.

On FEELTECK machines, the adjustment screw is located on the side or rear of the hopper assembly. The rule is simple:

• Turn the screw clockwise ("+") to loosen — this increases the gap, allowing notes to feed more freely. Use this when the machine is jamming or not picking up notes.
• Turn the screw counter-clockwise ("-") to tighten — this narrows the gap, reducing double-feeds. Use this when you see E2 (Double Error) or E3 (Chain Error) codes.

Adjust in very small increments—no more than a quarter-turn at a time. After each adjustment, test with a small batch of 10–20 notes. The ideal setting produces clean, single-note feeding without hesitation or jamming. If you find yourself adjusting frequently, the feed rollers may be worn and need replacement (see Section 6).

4. Common Error Codes and Fixes

FEELTECK bill counters display error codes to pinpoint the source of a problem. Here is the complete reference table:

5. Hardware Sensor Failure Codes: CE01–CE08

Error codes prefixed with "CE" indicate a hardware-level sensor failure rather than a note-detection issue. These require more attention than operational error codes:

6. CIS Calibration Procedure

CIS calibration aligns the contact image sensor's white balance, black level, and color reference points. Perform calibration after any sensor cleaning, after replacing the CIS module, or when you notice an increase in E10/E15 errors. The procedure takes approximately 2–3 minutes.

1. Power on the machine and allow it to complete its self-test (30 seconds). The display should show the ready/standby screen.
2. Enter the service menu: on most FEELTECK models, hold the "MODE" or "MENU" button for 3 seconds until the display shows the configuration interface. Navigate to "Calibration" or "CIS Adjust."
3. Select "White Calibration" or "CIS Calibration." The machine will prompt you to insert the calibration film.
4. Place the white plastic calibration film (supplied with every FEELTECK machine) into the hopper, centered and flat. The film is approximately the size of a banknote and has a pure white surface with known reflectance properties.
5. Close the transport cover smoothly—do not slam it. The CIS glass and calibration film must make even contact.
6. Press "START" to begin. The machine will pull the calibration film through the transport path while the CIS scans it. The process takes 10–15 seconds. The display will show "OK" or "PASS" when complete.
7. Remove the calibration film and proceed to color balance: insert a genuine red-colored banknote (such as a Chinese 100 RMB or a Euro 10 note) and run it through in counting mode. The machine uses this pass to verify and fine-tune color channel balance.
8. Exit the service menu and run a test count with 20–30 notes. Confirm that no image-related errors appear.

Store the calibration film flat in its protective sleeve. A bent or scratched calibration film produces inaccurate calibration. Replacement films are available from FEELTECK as a spare part.

7. When to Replace Wear Parts

Certain components are designed to wear over time and are considered consumable spare parts. Recognizing the signs of wear prevents cascading failures.

FEELTECK supplies complete spare part kits with rollers, pads, belts, and calibration film. We recommend keeping one spare kit on hand for each machine so that wear parts can be replaced during scheduled downtime rather than after a failure.

8. Quick Troubleshooting Reference

Machine has no power

Check the power cable connection at both the machine and wall outlet. Test the outlet with another device. Check if the power strip or surge protector has tripped. If the machine has a fuse (accessible near the power inlet), inspect and replace with an identically rated fuse. If none of these resolve the issue, the internal power supply may have failed—contact support.

Machine will not feed notes

First, check the note condition: crumpled, folded, or excessively worn notes may not feed properly. Flatten curled corners before loading. Second, adjust the hopper screw clockwise to loosen the feed gap. Third, inspect the feed rollers for glazing—shiny rollers have lost grip and must be replaced. Finally, confirm that the hopper guide plate moves freely and the spring is engaged.

Miscounting (consistently off by 1–3 notes)

Clean all sensors thoroughly. Flatten the note stack and fan it to separate any stuck notes. Run the CIS calibration procedure. If the problem persists, the counting sensors (left/right pair at the transport path entrance and exit) may be obstructed by compacted dust—this requires disassembly of the transport cover for deep cleaning, which should be performed by a technician.

Continuous beeping during counting

This usually indicates the machine is rejecting every note as suspicious. Causes include: a severely contaminated UV or MG sensor (clean immediately), counting a batch of genuine notes that have been chemically treated (laundered money), or the counterfeit detection sensitivity being set too high in the menu. Reduce sensitivity by one level and retest. If beeping stops, the notes are fine—the sensitivity was simply too aggressive for your currency's feature strength.

Regular maintenance is the difference between a bill counter that lasts three years and one that lasts a decade. For more guidance on selecting the right machine for your operation, see our Bill Counter Buyer's Guide and our Counterfeit Detection Technology deep-dive.