Diagnostic report for Zebra KR403 paper jams during boarding pass dispensing. Focus: formatting issues, sensor calibration, and external maintenance.
Check paper GSM rating against the printer's recommended specs.
Verify driver compatibility and update if necessary.
Isolate hardware malfunction versus software issues.
The KR403 employs optical sensors to detect paper presence and position during printing. Sensor calibration drift or signal attenuation due to accumulated debris can lead to misinterpretation of paper position. Incorrect paper feed rates or print head timing, driven by software settings, may also contribute to jams. Baud rate deviations between host system and the KR403 can corrupt print job data.
KR403 experiences paper jams specifically when dispensing boarding passes. The issue may correlate with a specific boarding pass format or encoding.
Ensure the KR403 is powered off before performing any cleaning or maintenance. Handle the device with care to avoid electrostatic discharge (ESD). Do NOT introduce liquids into the device.
Regularly clean the external paper path and accessible sensor surfaces with a dry, lint-free cloth. Inspect cables for damage and ensure they are securely connected. Implement scheduled driver and firmware updates.
Try printing the boarding pass as a generic image file (e.g., PNG or JPG). If it prints without jamming, the problem is likely related to the raw data stream or formatting, and NOT the printer hardware. Examine print job logs for error messages.