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HP LaserJet 9000dn Service Manual: Power-on; Table 28. Power-on Defects Or Blank Display

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Power-on

It is important to have the printer control panel functional as soon as possible in the troubleshooting
process so that the printer diagnostics can assist in locating printing errors.

Table 28. Power-on defects or blank display

Problem
Is AC power available at the
printer power receptacle?
Is the printer on/off switch set to
on?
Are the printer fans on?
NO
YES
206 Chapter 7 Troubleshooting
Action
Verify that power is available. See "Electrical specifications" in Chapter 1.
Push the switch to the on position.
P
/R
Press
AUSE
ESUME
to put the printer in the ready state.
Note:
The fan operation is significant since all fans are controlled by the printer's
DC controller PCA. Fans 1 through 6 will operate at full speed for 30 seconds
during the WAIT period. Fans 1-5 will slow to half speed and fan 6 will stop
during the STBY period, and when the printer is in PowerSave mode. Make
sure that the printer is not in PowerSave mode.
Operational fans indicate:
1
AC power is present in the printer.
2
DC power supply is functional (both 24V DC and 5V DC are being
generated).
3
DC controller PCA microprocessor is functional.
If the fans are NOT working, turn off the printer and remove the printer
formatter PCA. Disconnect all the printer paper handling options. Then turn
on the printer and check the fans again. If the fans are still not working,
perform the following steps:
1
Verify that all fans are connected to the DC controller PCA.
2
Perform an engine test.
If the fans are working, but the printer control panel is blank, print an engine
test. See "Engine test" on page 245. If the engine test is successful, perform
the following steps:
1
Reseat or replace the cable from the control panel that is connected to
the DC controller PCA.
2
Replace the control panel assembly.
3
Verify that the latest firmware is installed.
4
Replace the printer formatter PCA.
If the engine test is not successful, verify that there is no paper in the paper
path. Retry the engine test. If the engine test is still unsuccessful, perform the
following steps:
1
Verify that the latest firmware is installed.
2
Replace the DC controller PCA.
C8519-90912

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