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To test the control-panel display
To test the control-panel display and ensure that all characters are working correctly, complete the
following steps.
1 Make sure that the control-panel display reads Ready.
2 Press M
ENU
.
3 Press 2 on the keypad.
NOTE You can gain access to the secondary service menu from any other menu by
pressing 2.
4 Use the < or > button to select Display test, and then press Enter.
The device cycles through 15 characters at a time until the test is complete.
To view the firmware version
Use the secondary service menu to determine the device firmware version.
1 Make sure that the control-panel display reads Ready.
2 Press M
ENU
.
3 Press 2 on the keypad.
NOTE You can gain access to the secondary service menu from any other menu by
pressing 2.
4 Use the < or > button to select Show FW Version, and then press Enter.
The control panel shows the device firmware version number.
To enable or disable the memory-card slots
NOTE This procedure applies to the HP Color LaserJet 2840 all-in-one only.
1 Make sure that the control-panel display reads Ready.
2 Press M
ENU
.
3 Press 2 on the keypad.
NOTE You can gain access to the secondary service menu from any other menu by
pressing 2.
4 Use the < or > button to select Memory Cards, and then press Enter.
5 Use the < or > button to select Enabled or Disabled, and then press Enter.
To calibrate the color
1 Make sure that the control-panel display reads Ready.
2 Press M
ENU
.
304 Chapter 6 Troubleshooting ENWW
316


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