HP LaserJet Enterprise M552 - Control panel checks; Control-panel diagnostics; Touchscreen diagnostic mode (M553 x and M577)

8. If the print engine appears to be correctly operating (the engine test page successfully printed) and the
control panel is still blank, replace the low-voltage power supply (LVPS)
9. If after replacing the LVPS normal startup noises and lights are still not present, replace the DC
controller.
NOTE: If the error persists after replacing these assemblies, escalate the problem to the Global
Business Unit (GBU).
Control panel checks
NOTE: The printer includes a diagnostic test mode for the touchscreen control panel. Diagnostic tests are
not available for the LCD control panel.
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Control-panel diagnostics
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Control panel diagnostic owcharts (M553x and M577)
Control-panel diagnostics
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Touchscreen diagnostic mode (M553x and M577)
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Control-panel system diagnostics (M553x and M577)
Touchscreen diagnostic mode (M553x and M577)
Use the diagnostics in this section to test the control-panel hardware and embedded rmware. These tests
are useful for checking control-panel functionality independent of the printer control-panel system
diagnostics. To test the control panel using the system diagnostics, see Control-panel system diagnostics
(M553x and M577) on page 118.
1. M553x only: Locate the diagnostic-tests access button on the back of the control panel.
Figure 2-21 Diagnostic-tests access button
ENWW Troubleshooting process 113