User Manual
Table Of Contents
- About This Document
- Contents
- Introduction
- Getting Started
- Print Operations
- Determining Printer Configuration
- Thermal Printing
- Modes of Printing
- Print Media Types
- Replacing Supplies
- Adjusting the Print Width
- Adjusting the Print Quality
- Media Sensing
- Printing on Fan-Fold Media
- Printing with Externally Mounted Roll Media
- Fonts and Your Printer
- Stand Alone Printing
- Sending Files to the Printer
- Print Meter
- EPL Line Mode
- Printer Options
- Control Panel Operation
- Maintenance
- Troubleshooting
- Appendix
Maintenance
Replacing the Printhead
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980611-001 Rev. B GX420d User Guide 6/4/08
Other Printer Maintenance
There are no user level maintenance procedures beyond those detailed in this section. See the
Troubleshooting on page 77 for more information on diagnosing printer and print problems.
Replacing the Printhead
If you need to replace the printhead, read the procedure and review the removal and
installation steps before actually replacing the printhead.
Before following the steps in this procedure, open the printer by pulling the release latches
forward then lifting the top cover.
Printhead Removal
1. Push the printhead’s right side catch to the right.
Caution • Prepare your work area by protecting against static discharge. Your work area
must be static-safe and include a properly grounded conductive cushioned mat to hold the
printer and a conductive wrist strap for yourself.
Caution • Turn the printer power off and unplug the power cord before replacing the
printhead.