YOKOGAWA AQ4305, Instruction Manual, Page: 12 / 50

5 Fuses Safety Precautions
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5 Fuses
The AQ4305 uses time lag-type 3.15-amp fuses.
5.1 Replacing fuses
Under the standard configuration, the unit includes the fuses listed in the standard accessories
list (
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see section 1.3 Checking the Equipment and Accessories). If you need to replace a fuse
due to an equipment failure, first determine the cause of the failure and solve the problem before
replacing the fuse.
An AC power connector is located on the back side of this unit. The AC power connector contains
an inlet noise filter (made by Schaffner). The fuses are set in the inlet noise filter.
You can pull the fuse holder out.
Whenever you pull out the fuse holder and push it back in order to replace or check a fuse, be
sure to push it in to the point where the filter body and fuse holder are flush with each other. As
you push in the fuse holder, you will feel a click (there is some variation in the position at which
this occurs) (see illustration below).
If you stop pushing in the fuse holder when you feel the click, the electrical contact may be
incomplete or there may be no electrical contact. Using the equipment in this condition may
cause overheating and blow the fuses.
Danger
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Turn off the power switch and unplug the power plug from the power outlet before replacing a fuse.
Replacing a fuse while the power is on may result in injury due to electric shock.
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After replacing a fuse, perform one of the protective grounding procedures described in section 4.1
before turning the power back on. Make sure the AC supply voltage is at the proper level before turning
the power switch on. Turning the power on without a protective ground may result in injury due to
electric shock. If the AC supply voltage is not at the proper level, turning the power switch on may
damage the inside of the unit.
Fuse holder
Fig. 3 Properly closing the fuse holder