Keysight E8402A, E8404A C-Size MainframesUser and Service Guide2635 Servicing Your MainframeChapter OverviewThis chapter contains information for troubleshooting and replacing selectedcomponents of the Keysight E840xA VXI mainframe. This chapter includes thefollowing information:Problem Isolation page 263Replacing Assemblies page 265Replacement Power Cords page 274Problem IsolationTable 1 lists symptoms which could appear in the mainframe over time. Theassembly most likely responsible for the symptom is also listed. Notice thatcustomer repair of the Keysight E840xA is limited to replacement of the monitorprinted circuit (PC) assemblies (Enhanced Monitor PC board, temperaturemonitor PC boards, Enhanced Monitor display PC board), power supply, andimpeller assemblies.No Power Line FuseThere are no user-replaceable power line fuses in the Keysight E8402 and E8404VXI mainframes. If the mainframe power supply fails to operate, the powersupply should be replaced. Exchange assemblies are available; refer to Figure 2.There are no serviceable parts inside the mainframe. Repairis limited to replacement of the monitor printed circuitassemblies, power supply, power supply fan, and impeller(backplane fan). Replacement of these components mustbe performed at a static-controlled workstation by trainedservice personnel only.The front panel power switch does not disconnect all powerfrom internal circuits. Unplug the power cord before openingthe mainframe fro service.
