d. If the engine test page prints, the print engine is operating normally. Replace the formatter.
NOTE: M631dn only: If the engine test page does not print, turn the printer o, remove the
embedded MultiMedia Card (eMMC), and then try the engine test again. If the page prints, the
problem might be the eMMC.
e. If after replacing the formatter normal startup noises are still not heard, replace the DC controller.
NOTE: If the error persists after replacing these assemblies, escalate the problem to the Global
Business Unit (GBU).
Troubleshooting a blank control panel
A blank control panel display can be caused by one or more of the following:
110 Chapter 2 Solve problems ENWW
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