Fuse Replacement - Lakeshore 335 User Manual

8.6 Fuse
Replacement
FIGURE 8-2 Power fuse access
Use this procedure to remove and replace a line fuse.
To avoid potentially lethal shocks, turn off the controller and disconnect it from AC power
before performing these procedures.
For continued protection against fire hazard, replace the fuse only with the same fuse
type and rating specified for the line voltage selected.
Test the fuse with an ohmmeter. Do not rely on visual inspection of the fuse.
1. Locate the line input assembly on the instrument rear panel. See Figure 8-2.
2. Turn the power switch Off (O).
3. Remove the instrument power cord.
4. With a small screwdriver, release the drawer holding the line voltage selector
and fuse.
5. Remove existing fuse(s). Replace them with proper Slow-Blow (time-delay) fuse
ratings as follows: 100/120/220/240 V; 3.15 A T 250 V; 5 × 20 mm.
6. Re-assemble the line input assembly in reverse order.
7. Verify that the voltage indicator is in the line input assembly window.
8. Connect the instrument power cord.
9. Turn the power switch On (l).

8.6 Fuse Replacement

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