Fujitsu F53 Bill Dispenser: Faded Ink Diagnostic and... | terminalfaults.org

Technical Background:

The Fujitsu F53 utilizes a thermal transfer print head operating at 24V DC. The print head heats specific points on a ribbon, transferring ink to the bill. Insufficient voltage or a degraded print head results in faded output. Solenoids control bill movement. Polymer bills are more sensitive to printing artifacts.

Symptoms:

Dispensed currency exhibits faded ink or light printing. Consistent across multiple bills. No mechanical jamming reported.

Possible Causes:

Low voltage supply to the print head (less than 23V DC).
Degraded or worn print head element.
Incorrect print head calibration settings.
Expired or low-quality thermal transfer ribbon.
Environmental factors affecting ribbon storage (high humidity or extreme temperatures).
Contamination on the print head surface.

Solution:

1

Power cycle the Fujitsu F53. Remove power, wait 60 seconds, and reapply.
2

Inspect the thermal transfer ribbon for proper system and sufficient supply.
3

Check the 24V DC power supply output to the F53 using a multimeter. Verify voltage is within +/- 5% tolerance.
4

Clean the print head with a lint-free cloth and isopropyl alcohol (99% concentration) *after* powering down.
5

Run the internal diagnostic print routine (refer to the F53 service manual for key combinations).
6

If the diagnostic print is also faded, replace the thermal transfer ribbon with a new, known-good ribbon.
7

If problem persists after new ribbon, consider replacing the print head assembly. *Note: This procedure requires specific tools and ESD protection.*

Safety Warning:

The Fujitsu F53 operates on 24V DC. Disconnect power before performing any maintenance or cleaning. High voltage components are present internally; do not attempt to disassemble the unit beyond the recommended maintenance procedures. Observe ESD precautions when handling electronic components.

Prevention:

1. Regularly clean the bill dispenser interior to prevent dust accumulation (every 3 months). 2. Store thermal transfer ribbons in a cool, dry place. 3. Replace the thermal transfer ribbon proactively based on usage volume (refer to manufacturer guidelines). 4. Implement a scheduled diagnostic print test (weekly) to detect print quality degradation early. 5. Inspect and clean the print head every 6 months.

Expert Tip:

Check the ribbon tension. If the ribbon is too loose, it can cause inconsistent ink transfer. Some models have a tension adjustment screw or dial. Also, try using a ferrite choke on the DC power cable to reduce electrical noise that might be affecting the print head voltage.

Frequently Asked Questions

•What is the expected lifespan of the print head?

The print head lifespan is approximately 500,000 prints, but can vary based on ribbon quality and environmental factors.

•What type of thermal transfer ribbon is recommended?

Use only Fujitsu-approved thermal transfer ribbons to ensure optimal print quality and prevent damage to the print head.

•Are there any software updates that address print quality issues?

Check the Fujitsu website for the latest firmware updates for the F53. Firmware updates can sometimes improve print head control and ink density.

Fujitsu F53 Bill Dispenser: Faded Ink Diagnostic and Maintenance

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the expected lifespan of the print head?

•What type of thermal transfer ribbon is recommended?

•Are there any software updates that address print quality issues?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: