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Print Quality Problems

There are long tracks of missing print (blank vertical lines) on several labels.

•The printhead is dirty. Clean the printhead.

•The printhead elements are damaged.

The printing does not start at the top of the label or misprinting of one to three labels.

•The media may not be threaded correctly. Follow the instructions for Loading Roll Media on page 11 in the Getting Started section.

•The printer needs to be calibrated. Refer to the two-flash sequence of Feed Button Modes on page 76 in this section.

•ZPL Label Formats - The correct media sensor may not be activated. Manual calibration selects the media sensing method for the labels being used (refer to the ^MN command in the ZPL Programming Guide).

•ZPL Label Formats - Verify that the Label Top (^LT) command is correctly set for your application (consult the ZPL Programming Guide).

•EPL Label Formats - The correct media sensor may not be activated for label dispensing, blackline or notch sensing, or for Gap/Web sensing. Manual calibration selects the media sensing method for the labels being used (refer to the O and Q commands in the EPL Programmer’s Guide).

•EPL Label Formats - Verify that the Set Label Length (Q) command is correctly set for your application (consult the EPL Programmer’s Guide).

A ZPL label format was sent to, but not recognized by, the printer.

•Is the printer in pause mode? If so, press the Feed button.

•If the status LED is on or flashing, refer to What the Status Light is Telling You on page 66.

•Make sure the data cable is correctly installed.

•A communications problem has occurred. First, make sure that the correct communications port on the computer is selected. Refer to Connecting your Printer to a Computer on page 22 in the Getting Started section.

•Verify the correct Format and Control Prefix on the printer match what you are using in your ZPL programmed label format. The default Format (COMMAND CHAR) is Caret

(^) character and the Control (CONTROL CHAR) is a Tilde (~) character. Verify the characters with the Configuration Status label printout. Refer to the one-flash sequence of Feed Button Modes on page 76 to print this label.

P1052686-001

GC420t™ User Guide

5/22/2012

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Zebra Technologies GC420t manual Print Quality Problems
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GC420t specifications

Zebra Technologies GC420t is a compact and versatile thermal transfer printer designed for a variety of printing applications. This printer is particularly favored in retail, healthcare, manufacturing, and logistics due to its robust performance and user-friendly features.

One of the standout characteristics of the GC420t is its print speed. This printer can achieve speeds of up to 5 inches per second, making it efficient for high-volume printing tasks. With a maximum print resolution of 203 dpi, the GC420t produces clear and legible labels, receipts, and tags, which is essential in environments where accurate information is critical.

The GC420t utilizes thermal transfer technology, which involves the use of a ribbon to transfer ink onto the substrate. This method is particularly beneficial for producing high-quality prints that are resistant to smudging, scratching, and fading. This durability makes it suitable for labeling products that require a long-lasting solution.

In addition to its printing capabilities, the GC420t features a user-friendly design. The printer's simple setup and intuitive control panel make it easy for users to operate without the need for extensive training. The included ZPL II and EPL programming languages enable seamless integration into existing systems, further enhancing the ease of use.

The GC420t is also equipped with diverse connectivity options, including USB, serial, and parallel interfaces. This flexibility allows for easy integration into various environments and simplifies the connection to computers and other devices. Moreover, the printer's compact design ensures it can fit comfortably in small spaces, making it ideal for environments with limited room.

When it comes to media handling, the GC420t supports a wide range of label sizes and types. Whether you need to print shipping labels, barcode labels, or asset tags, this printer can accommodate your requirements. The adjustable media guides allow for quick and easy adjustments to suit different media types.

In conclusion, Zebra Technologies GC420t stands out as a reliable, efficient, and user-friendly thermal transfer printer. Its robust features, including high print speed, durable output, versatile connectivity options, and adaptability to various media types, make it an essential tool for businesses looking to enhance their labeling and printing processes. Whether in retail, healthcare, or logistics, the GC420t delivers performance and reliability that organizations require.
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