Keysight E8402A, E8404A C-Size Mainframes User and Service Guide 273Replacing Assemblies Servicing Your Mainframe6 Install the replacement impeller assembly by lining up the horizontal slots onthe bottom of the impeller assembly with the raised edges on the mainframe.Slide the impeller assembly into the mainframe until the impeller housing isover the screw locators.7 Reconnect the impeller wires to the adapter board. Tighten the impellerscrews into the screw locators.8 Replace the rear panel. Make certain that all 14 screws are secured.Replacing the Enhanced Monitor Display LampTo replace the Enhanced Monitor back-light bulb:1 Turn off the mainframe and remove the power cord.2 Remove the rear panel. Refer to “Removing the Rear Panel from theMainframe” on page 265 for instructions.3 Remove the mainframe cover by removing the ten m3x6 flat head torx screws(five on each side of the mainframe). Refer to “Removing the MainframeCover” on page 267.4 Carefully remove the Enhanced Monitor PC board (three screws and threeribbon cables). Unplug the bulb cord from the display driver PC board. Referto Figure 8.5 Carefully remove the display assembly from the mainframe front panel.6 Slide the old bulb from the display and replace it with the new bulb.7 Replace the display assembly.8 Replace the Enhanced Monitor PC board. Reattach all cables.9 Replace the mainframe cover and the rear panel. Make certain that all screwsare secured.Figure 5-8 Replacing the Display Back-light BulbRemove/ReplaceBulbDisplay
