HP LaserJet Pro 400 Service Manual - Page 141
Power-on checks, voltage. Do not plug the product into a surge protector or power strip.
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General topic Toner cartridges Transfer unit and fuser Doors Condensation Miscellaneous Questions ● Is each toner cartridge installed correctly? ● Are the transfer unit and fuser installed correctly? ● Is the front door closed? ● Does condensation occur following a temperature change (particularly in winter following cold storage)? If so, wipe affected parts dry or leave the product on for 10 to 20 minutes. ● Was a toner cartridge opened soon after being moved from a cold to a warm room? If so, allow the toner cartridge to sit at room temperature for 1 to 2 hours. ● Check for and remove any non-HP components (for example, toner cartridges or memory modules) from the product. ● Check to see whether the hardware or software configuration has changed or the problem is not associated with any specific software. ● Remove the product from the network and ensure that the failure is associated with the product before beginning troubleshooting. ● For any print-quality issues, calibrate the product. See Calibrate the product on page 137 Power-on checks When you turn on the product, if it does not make any sound or if the control-panel display is blank, check the following items: ● Verify that the product is plugged directly into an active electrical outlet that has the correct voltage. Do not plug the product into a surge protector or power strip. ● Verify that the power button is in the on position. ● Verify that the formatter is seated correctly. ● Remove any HP Jetdirect or other devices, and then try to turn the product on again. ● Ensure that the control-panel display is connected. ● Check the two fuses on the power supply. ● If necessary, replace the power supply. ● If necessary, replace the DC controller. ENWW Troubleshooting process 115