HP 4550 Service Manual - Page 215
Troubleshooting flowchart
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Table 7-1 Pre-troubleshooting checklist Environment Is the printer installed on a solid, level surface? Is the power supply voltage within ± 10 volts of the specified power source? Is the power supply plug inserted in the printer and the outlet? (Also verify that the short power cord of the duplex unit is plugged into the printer, and the power supply plug of the paper deck at the duplex unit is properly connected.) Is the operating environment within the specified parameters, as listed in Chapter 1 of this manual? Is the printer exposed to ammonia gas, such as that produced by diazo copiers or office cleaning materials? Is the printer exposed to direct sunlight? Media checks Does the customer use only supported media? Is the media in good condition (no curls, folds, etc.)? Is the media stored correctly and within environmental limits? Media source Is the specified volume (or less) loaded into the media source? Is the printer set to the correct media source? Toner cartridge Are the color toner cartridges for each color correctly installed? Drum cartridge Is the drum cartridge seated in the printer properly? ITB and fusing Are the ITB and fusing units seated properly? Doors and drawers Are the toner cartridge door, duplexer, drum drawer, and ITB drawer closed? Condensation Does condensation occur following a temperature change (particularly in winter following cold storage)? If so, wipe affected parts dry or leave the printer on for 10 to 20 minutes. Miscellaneous Check for and remove any non-HP components (toner, memory modules, and EIO cards) from the printer. If hardware or software configuration has not changed, or the problem is not associated with any specific software, contact the Customer Care Center (see Chapter 1). Remove the printer from the network and ensure that the failure is associated with the printer before beginning troubleshooting. Remove the printer from the network and ensure that the failure is associated with the printer before beginning troubleshooting. WARNING! Electrical current is present in various printer parts whenever the printer is plugged in, even if the power switch is in the standby position. Line voltage is exposed when the right cover and formatter pan are removed. Troubleshooting flowchart The troubleshooting flowchart shown in Figure 7-1 highlights the processes that quickly solve printer hardware problems. During its power on sequence, the printer verifies that its components are operating correctly. If the printer fails to power on correctly, use the steps shown to troubleshoot the failure. Each heading depicts a major troubleshooting step. A "yes" answer to the questions allows you to proceed to the next major step. A "no" answer indicates that additional testing is needed. Proceed to the referenced location and follow the directions for that area. After completing the additional testing, proceed to the next major step. C7085-90921 Chapter 7 Troubleshooting 213