Dell PowerEdge T420 - Figure 6. LCD Control Panel; Figure 7. QRL Location

15 PowerEdge T420 Technical Guide
Front control panel
Figure 6 shows the T420 control panel, located on the front of the chassis. For more information
about the LCD control panel, see the Dell PowerEdge T420 Systems Owner’s Manual on
Dell.com/Support/Manuals.
Figure 6. LCD control panel
Quick Resource Locator
A useful feature included with Dell PowerEdge 12
th
generation servers is the Quick Resource Locator
(QRL) — a model-specific Quick Response (QR) code that is located inside the T420 chassis cover
(see Figure 7). Use your smartphone to access the Dell QRL app to learn more about the server.
Figure 7. QRL location
This QRL code allows you to:
 View step-by-step videos, including overviews of system internals and externals, as well as
detailed, concise, task-oriented videos and installation wizards
 Locate reference materials, including searchable owner’s manual content, LCD diagnostics, and
an electrical overview
 Look up your service tag so you can quickly gain access to your specific hardware configuration
info and warranty information
 Contact Dell directly (by link) to get in touch with technical support and sales teams and provide
feedback to Dell
These codes provide an easy way to retrieve the critical support information you need when you
need it, making you more efficient and effective in managing your hardware.