Anritsu Series MS278XB operation manual Replacing the Line Fuses, Internal Battery

Preventive Maintenance General Information

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.

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.

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.

Figure 1-3.Replacing the Rear Panel Fuse

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.

1-8 MS278XB OM