Fuse Replacement; Ac Line Fuse; Power Supply Fuses; Line Voltage Selection - Fluke 5220A Instruction Manual

5 220A
Instruction Manual

4-14. Fuse Replacement

4-15. Ac Line Fuse

The ac line fuse is accessible by way of a rear-panel fuse holder located to the left of the
input power connector. If fuse replacement is required, disconnect the 5220A from line
power and remove the fuse cap and fuse (twist the fuse cap ccw using a screwdriver).
Select and install a replacement fuse whose rating is compatible with the local line
voltage.

4-16. Power Supply Fuses

There are six fuses located inside of the 5220A. Each is used to fuse one of the secondary
windings of the power transformer. Four of the fuses are located on the A2 Transformer
Assembly, and two are on the A3 Cap Bus. Their locations (F2 through F7) are shown in
Figure 4-1. Use the following procedure when replacement is necessary:
1. Disconnect the 5220A from line power.
2. Remove the top and large inner covers from the 5220A.
3. With reference to Figure 4-1, locate and inspect fuses F2 through F7. The fuses are
4. Replace defective fuses with the appropriate type and rating:

4-17. Line Voltage Selection

The 5220A is set at the factory to operate at a line voltage of either 115 or 230 V ac
+10%, 40 to 60 Hz. The selected voltage is identified on a rear panel decal. If your local
line voltage is not within this preset range, a suitable range may be selected by setting a
series of three switches (S1, S2, S3) on the A1 Transformer Assembly. Figure 4-2 shows
the switch locations as well as the switch settings for eight different line voltages. Use the
following procedure to set the line voltage switches:
1. Disconnect the 5220A from line power.
2. Remove both the top cover and the large inner cover from the 5220A.
3. With reference to Figure 4-2, locate and set switches S1, S2, and S3 to the positions
4. Reinstall the top and inner covers.
4-6
100 to 120 V ac: Use fuse type MDA 3 A
220 to 240 V ac: Use fuse type MDX 1.5 A
installed in fuse clips and can be pulled out using your fingers.
a. F2 and F3 are AGC 20 A fuses.
b. F4 through F7 are MDL 1/2 A fuses.
indicated for the desired line voltage.