Power-on checks
The basic MFP functions should start up as soon as the MFP is plugged into an electrical outlet and
the power switch is pushed to the on position. If the MFP does not start, use the information in this
section to isolate and solve the problem.
Power-on troubleshooting overview
Turn on the MFP power. If the control-panel display remains blank, random patterns appear, or
asterisks remain on the display, perform power-on checks to locate the cause of the problem.
During normal operation, the main cooling fan begins to spin briefly after the MFP power is turned
on. Place your hand over the holes in the rear cover, above the formatter. If the fan is operating, you
will feel a slight vibration and feel air passing into the MFP. You can also lean close to the MFP and
hear the fan operating. When this fan is operational, the dc side of the power supply is functioning
correctly.
After the fan is operating, the main motor turns on (unless the top cover is open, a jam condition is
sensed, or the paper-path sensors are damaged). You should be able to visually and audibly
determine if the main motor is turned on.
If the fan and main motor are operating correctly, the next troubleshooting step is to isolate print
engine, formatter, and control-panel problems. Perform an engine test (see
Engine test). If the
formatter is damaged, it might interfere with the engine test. If the engine test page does not print, try
removing the formatter and then performing the engine test again. If the engine test is then
successful, the problem is almost certainly with the formatter, the control panel, or the cable that
connects them.
If the control panel is blank when you turn on the MFP, check the following items.
1 Make sure that the MFP is plugged into an active electrical outlet that delivers the correct voltage.
2 Make sure that the power switch is in the on position.
3 Make sure that the fan runs briefly, which indicates that the power supply is operational.
4 Make sure that the control-panel display wire-harness is connected. See
Control panel.
5 Make sure that the firmware flash memory card and the formatter are seated and operating
correctly. See
Flash memory card (firmware).
6 Remove any HP Jetdirect or other EIO cards, and then try to turn the MFP on again.
NOTE If the control-panel display is blank, but the main cooling fan runs briefly after the
MFP power is turned on, try printing an engine test page to determine whether the problem is
with the control-panel display, formatter, or other MFP components. See
Engine test.
If the main cooling fan is not operating, check the following items.
1 Check the fuse on the power-factor correction (PFC) power supply (location FU1; near the power
switch) to make sure that it is not open.
2 If necessary, replace the PFC power supply PCA. See
Power-factor-correction (PFC) power
supply.
308 7 Troubleshooting
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