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Preventive Maintenance General Information
1-8 MS278XB OM
Replacing the Line Fuses
The line fuses used in the MS278XB are 6.3A, type T fuses. The line fuse values are printed on the rear panel
next to the power connector. Always use a new fuse of the type and rating specified by the fuse markings on the
rear panel of the instrument. To replace the line fuses, follow the procedure below.
Refer to Figure 1-3, below, during the following steps:
1. Set the MS278XB to standby mode using the power button and disconnect the power cord from the rear
panel power receptacle.
2. Using a small flat-blade screwdriver, carefully pry under the tab next to the rear panel power receptacle
to open the fuse block cover and gain access to the fuse holder.
3. Slide out the fuse holder.
4. Replace the fuse in the fuse holder.
5. Install the fuse holder back into the rear panel fuse block.
6. Close the cover to secure the fuse holder in place. The cover will close with an audible snap.
7. Reconnect the analyzer to the power source and set the MS278XB to Operate using the front panel power
button.
Internal Battery
The MS278XB has a Lithium battery installed on the CPU assembly. Battery replacement should be referred
to an authorized Anritsu service center.
Danger: Before changing the fuse, always remove the power cord from the power outlet. There is the risk of
receiving a fatal electric shock if the fuse is replaced with the power cord connected.
Figure 1-3. Replacing the Rear Panel Fuse