8.3 Replacing the Fuses
Background
There are two fuses in the power entry module at the back of the unit. This module also incorporates the system’s master On/Off switch and an EMI/RFI electrical filter. If power is properly applied to the system but the electronics are not energized, the problem might be due to a blown use.
Figure 27. HDV500 Power Entry Module
Procedure
To check and replace fuses, refer to the following figure and perform the following steps:
WARNING
If work is to be done inside of the metrology unit or on the power entry module, always first unplug the 115V or 230V power cable to remove dangerous line voltages.
1. Unplug the power cable from the power entry module.
2. Pry open the cover above the power switch by using a small flat-blade screwdriver.
3. Pry out the red fuse holder by using the small flat-blade screwdriver.
4. Check the existing fuses for electrical continuity.
5. Replace any blown fuse with a fresh fuse of the same size and type. The fuse holder can hold two 5 x 20 millimeter or 1/4 x 1-1/4 inch, 5A, 250 VAC time delay fuses.
6. After replacing the fuses, press in the red fuse holder.
7. Press the cover above the power switch.
8. Plug in the power cable.
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