Maintenance
Introduction
7
7-3
7-1. Introduction
This chapter explains how to perform the routine maintenance and calibration task
required to keep a normally operating 5520A Calibrator in service. These tasks include:
• Replacing the fuse
• Cleaning the air filter
• Cleaning the external surfaces
• Calibration verification
Refer to the Service manual for intensive maintenance tasks such as troubleshooting,
calibration or repair, and all procedures that require opening the cover of the instrument.
The Service Manual also contains complete, detailed verification and calibration
procedures.
7-2. Replacing the Line Fuse
The line power fuse is accessible on the rear panel. The fuse rating label above the ac
power input module shows the correct replacement fuse for each line voltage setting.
Table 7-1 lists the fuse part numbers for each line voltage setting.
To check or replace the fuse, refer to Figure 7-1 and proceed as follows:
1. Disconnect line power.
2. The line power fuse and line voltage switch are located in a compartment on the
right end of the ac input module. To open the compartment and remove the fuse,
insert the blade of a standard screwdriver to the left of the tab located at the left side
of the compartment cover.
3. Pry the tab out of the slot and the compartment cover will pop part way out.
4. Remove the compartment cover with your fingers.
5. The fuse comes out with the compartment cover and can be easily replaced.
6. To reinstall the fuse, push the compartment cover back into the compartment until
the tab locks with the ac input module.
Table 7-1. Replacement Fuses
Part Number Fuse Description Line Voltage Setting
W 109215 5A/250 V Time Delay 100 V or 120 V
W 851931 2.5A/250 V Time Delay 200 V or 240 V
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