HP Color LaserJet Enterprise CP4020 Service Manual - Page 271
Troubleshooting flowchart, in
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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 more testing is needed. Go to the appropriate section in this chapter, and follow the instructions there. After completing the instructions, go 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 240. After the control panel display is functional, see step 2. 2 Control panel messages Does the message Ready display on the control panel? Yes No If an error message displays, see Interpret control-panel messages on page 345. After the errors have been corrected, go to step 3. 3 Event log Open the DIAGNOSTICS menu and print an event log to see the history of errors with this product. Does the event log print? If the event log does not print, see Print an event log on page 376. If paper jams inside the product, see Clear paper jams on page 383. Yes No If error messages display on the control panel when you try to print an event log, see Interpret control-panel messages on page 345. 4 Information pages After successfully printing and evaluating the event log, see step 4. Open the INFORMATION menu and print the configuration pages to verify that all 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, see 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 Image defects table on page 410. After the print quality is acceptable, see step 6. 6 Interface Can the customer print successfully from the Verify that all I/O cables are connected correctly and that a valid host computer? IP address is listed on the Jetdirect configuration page. Yes. This is the end of No the troubleshooting process. If error messages display on the control panel, see Interpret controlpanel messages on page 345. When the customer can print from the host computer, this is the end of the troubleshooting process. ENWW Troubleshooting process 239