HP Color LaserJet Enterprise CM4540 Service Manual - Page 421

Troubleshooting flowchart This flowchart highlights the general processes that you can follow to quickly isolate and solve product hardware problems. Each row depicts a major troubleshooting step. A "yes" answer to a question allows you to proceed to the next major step. A "no" answer indicates that additional testing is needed. Proceed to the appropriate section in this chapter, and follow the instructions there. After completing the instructions, proceed to the next major step in this troubleshooting flowchart. Table 3-2 Troubleshooting flowchart 1 Power on Is the product on and does a readable message display? Yes No Follow the power-on troubleshooting checks. See Power subsystem on page 370. After the control-panel display is functional, go to step 2. 2 Control panel messages Does the message Ready display on the control panel? Yes No If an error message appears, see Control-panel messages on page 470. After the errors have been corrected, go to step 3. 3 Event log 4 Information pages Open the Troubleshooting menu and print an event log to see the history of errors with this product. Does the event log print? Yes No If the event log does not print, see Print an event log on page 570. If paper jams inside the product, see Clear jams on page 581. If error messages appear on the control-panel display when you try to print an event log, see Control-panel messages on page 470. After successfully printing and evaluating the event log, go to step 4. Open the Information menu and print the configuration pages to verify that all of the accessories are installed. Are all the accessories installed? If accessories that are installed are not listed on the configuration page, remove the accessory and reinstall it. After evaluating the configuration pages, go to step 5. Yes No 5 Image quality Does the print quality meet the customer's requirements? Yes No Compare the images with the sample defects in the image defect tables. See Print quality examples on page 614. After the print quality is acceptable, go to step 6. 6 Interface Can the customer print successfully from the host computer? Yes. This is the end of No the troubleshooting process. Verify that all I/O cables are connected correctly and that a valid IP address is listed on the Jetdirect configuration page. If error messages display on the control panel, see Control-panel messages on page 470. When the customer can print from the host computer, this is the end of the troubleshooting process. ENWW Troubleshooting process 369