Top cover switch assembly Note Turn the printer off, wait five seconds, and then unplug the printer. Two versions of the HP Color LaserJet 4500 series printers are available. To identify which printer version you are servicing, see page 140. To remove the top cover switch assembly 1 Remove the top cover. 2 Remove the left side cover. 3 Remove the RFI shield. 4 Disconnect the sensor and switch cables from the top cover switch assembly (callout 1, Figure 6-18 on page 162). 5 Follow the instructions below, depending on the version of printer that is being serviced. For HP Color LaserJet 4500 printer serial numbers xx G or lower: 1 Free the sensor and switch cables from their cable stays.
2 Remove the two screws from the top cover switch assembly (callout 2, Figure 6-18 on page 162). 3 Slide the switch assembly to the left side of the printer, and then lift it up and out. For printer HP Color LaserJet 4500 serial numbers xx H or higher and HP Color LaserJet 4550 printers: 1 Open the drum drawer (top drawer) until it stops and remove the imaging drum, protecting it from light. CAUTION Exposure to light for more than 15 seconds can seriously damage the imaging drum. 2 Free the cables from the five cable stays (callout 3, Figure 6-18 on page 162).
3 Remove the two screws that secure the switch assembly and lower cable guide to the printer frame (callout 1, Figure 6-19 on page 162). 4 Pull the rear door switch arm toward the front of the printer while lifting the switch assembly up and out slightly, taking care not to damage the cable guide. 5 Release the five plastic retaining clips securing the switch assembly to the lower cable guide to remove the switch assembly. Replacement tip When replacing the top cover switch assembly, make sure the cable is lying flat in the cable guide. Secure the two tabs on the right side of the switch assembly/cable guide before snapping the three tabs in place on the left side of the assembly.
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