d. If the engine test page prints, the print engine is operating normally.
e. If the engine test page does not print, replace the low-voltage power supply (LVPS):
●
RM2-7165-000CN (M552, M553)
●
RM2-7164-000CN (M577)
f. If, after replacing the LVPS, normal startup noises are still not heard, replace the DC controller:
●
RM2-7186-000CN (M552, M553)
●
RM2-7187-000CN (M577)
g. If after replacing the DC controller normal startup noises are still not heard, replace the fuser
power supply (RM2-7125-000CN).
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:
●
No power to the printer
●
Power supply has tripped (over-current/over-voltage/temperature issue)
●
Connectors on the formatter are not fully seated
TIP: The three LEDs on the formatter indicate that the printer is functioning correctly.
HP recommends fully troubleshooting the formatter and control panel before replacing either assembly.
Use the connectivity LED to troubleshoot formatter and control panel errors to avoid unnecessarily
replacing these assemblies. See the LED diagnostics section in the printer troubleshooting manual.
●
Faulty component installed on the formatter (for example, memory DIMM or disk drive)
●
Control panel connectors not fully seated
ENWW Troubleshooting process 111
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