HP 4550 Service Manual - Page 176

Note Note High-voltage power supply To remove the high-voltage power supply (HVPS) Turn the printer off, wait five seconds, and then unplug the printer. Two versions of the HP Color LaserJet 4500 series printers are available; the newer version is equivalent to the HP Color LaserJet 4550 unless otherwise noted. To identify which printer version you are servicing, see page 140. 1 Remove the formatter pan assembly. 2 Remove the power supply. Some printers have a cover over the high-voltage power supply. 3 Remove the rear door. 4 Remove the fusing assembly. 5 Disconnect the four cables from their connectors (callout 1, Figure 6-32 or callout 1, Figure 6-33, depending on the version of printer being serviced). 6 Free the cable harness from the cable stays. 7 Remove the four brass screws shown in callout 2, Figure 6-32 from the HVPS. 8 Carefully pull the HVPS out. Ensure that the rear plastic retaining strap attached to the HVPS clears the chassis and its remaining components. High-voltage power supply replacement tip When reinstalling the HVPS, carefully insert the plastic retaining strap attached to the rear of the HVPS through the chassis. 2 1 Figure 6-32 High-voltage power supply removal and replacement (newer version HP Color LaserJet 4500 and HP Color LaserJet 4550 printers) 174 Removal and replacement C7085-90921