Citizen CL-S621: Diagnostic and Resolution for Error 502... | terminalfaults.org

Technical Background:

502 suggests a breakdown in serial or USB communication. Baud rate mismatches, cable integrity, or driver issues on the host system can disrupt data transfer. External EMI (Electromagnetic Interference) and ESD (Electrostatic Discharge) can also corrupt data packets during transmission. Incorrect voltage on the data lines can also create this error.

Symptoms:

Citizen CL-S621 printer displays error 502. This typically indicates a communications error between the printer and the host system.

Possible Causes:

Faulty or damaged USB or serial cable.
Incorrect printer driver installed on the host system.
Baud rate or communication settings mismatch between the printer and host system.
Loose or improperly connected cable connections.
Electromagnetic interference (EMI) near the cable or printer.
Software conflict on the host system interfering with printer communication.

Solution:

1

Safe Handling: Power down and unplug the Citizen CL-S621 printer from the power source and host system.
2

Inspect Cables: Check the USB or serial cable for any visible damage, bends, or breaks. Replace the cable with a known working cable.
3

Verify Connections: Ensure the cable is securely connected to both the printer and the host system. Reseat the connections.
4

Driver Resystem: Uninstall the existing printer driver from the host system and reinstall the latest driver from the Citizen website.
5

Communication Settings: Verify that the baud rate, data bits, parity, and stop bits settings are identical on both the printer and the host system. Consult the printer's manual for default settings.
6

Test Environment: Temporarily relocate the printer to a different location to rule out EMI from nearby electronic devices.
7

Restart Systems: Reboot both the printer (after re-plugging) and the host system.

Safety Warning:

To prevent electrical shock, ensure the printer is unplugged before inspecting or cleaning any components. Avoid operating the printer in wet or humid environments. Static discharge is more prevalent in dry environments; ground yourself before touching the printer.

Prevention:

Regularly inspect and clean the printer and its cables. Secure cables to prevent strain and damage. Use a surge protector to protect the printer from power fluctuations. Keep the printer away from sources of electromagnetic interference.

Expert Tip:

If the error persists after driver reinstallation, try using a generic text-only printer driver to determine if the issue is driver-specific. Also, check the host system's event logs for any related errors or warnings regarding the printer communication.

Frequently Asked Questions

•What are the default communication settings for the Citizen CL-S621?

Refer to the Citizen CL-S621 user manual for the default baud rate, data bits, parity, and stop bits settings. Typically, the baud rate is 9600, data bits are 8, parity is None, and stop bits are 1.

•How do I uninstall and reinstall the printer driver on Windows?

Go to Device Manager, locate the Citizen CL-S621 printer, right-click and select 'Uninstall device'. Then, download the latest driver from the Citizen website and follow the installation instructions.

•Where can I find the latest printer drivers for the Citizen CL-S621?

Visit the official Citizen Systems website and navigate to the support or downloads section. Search for the CL-S621 model to find the appropriate drivers for your operating system.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What are the default communication settings for the Citizen CL-S621?

•How do I uninstall and reinstall the printer driver on Windows?

•Where can I find the latest printer drivers for the Citizen CL-S621?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: