HP LaserJet Enterprise M552 - Power subsystem; Power-on checks; Power-on troubleshooting overview

Table 2-8 Troubleshooting owchart (continued)
3
Event log
Open the Troubleshooting menu and print an
event log to see the history of errors with this
printer.
Does the event log print?
If the event log does not print, check for error messages.
If paper jams inside the printer, see the jams section of the printer
service manual.
If error messages display on the control panel when trying to print an
event log, see the control panel message section of the printer
troubleshooting service manual.
After successfully printing and evaluating the event log, see step 4.
Yes
No
4
Information pages
Open the Reports menu and print the
conguration pages to verify that all the
accessories are installed.
Are all the accessories installed?
If accessories that are installed are not listed on the conguration
page, remove the accessory and reinstall it.
After evaluating the conguration pages, see step 5.
Yes
No
5
Print quality
Does the print quality meet the customer's
requirements?
Compare the images with the sample defects in the image defect
tables. See the images defects table in the printer repair service
manual.
After the print quality is acceptable, see step 6.
Yes
No
6
Interface
Can the customer print successfully from the
host computer?
Verify that all I/O cables are connected correctly and that a valid
IP address is listed on the HP Jetdirect conguration page.
If error messages display on the control panel when trying to print an
event log, see the control-panel message section of the printer
troubleshooting service manual.
When the customer can print from the host computer, this is the end of
the troubleshooting process.
Yes. This is the end of
the troubleshooting
process.
No
Power subsystem
Power-on checks
The basic printer functions should start up when the printer is connected into an electrical outlet and the
power switch is pushed to the on position. If the printer does not start, use the information in this section to
isolate and solve the problem.
If the control panel display remains blank, random patterns display, or asterisks remain on the control panel
display, perform power-on checks to nd the cause of the problem.
Power-on troubleshooting overview
During normal operation, a cooling fan begins to spin briey after the printer power is turned on. Place a hand
over the vents in the rear cover, near the formatter. When the fan is correctly operating, air passing out of the
printer is felt. Lean close to the printer to hear the fan operating. If the fan is operating, the dc side of the
power supply is functioning.
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). Visually and audibly determine that the main motor is turned on.
If the fan and main motor are operating correctly, the next troubleshooting step is to isolate printer,
formatter, and control panel problems. Perform an 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
ENWW Troubleshooting process 109