III
WF1973/WF1974
Safety Precautions
To ensure safe use, be sure to observe the following warnings and cautions.
NF Corporation shall not be held liable for damages that arise from a failure to observe these
warnings and cautions.
This product is a Class I product (with protective conductor terminal) that conforms to the JIS and
IEC insulation standards.
●Be sure to observe the contents of this instruction manual.
This instruction manual contains information for the safe operation and use of this product.
Be sure to read this information first before using this product.
All the warnings in the instruction manual must be heeded to prevent hazards that may
cause major accidents.
●Be sure to ground the product.
This product uses a line filter and must be grounded to avoid the risk of electric shock.
To prevent electric shock, be sure to safely implement grounding such that ground resis-
tance is 100 Ω or lower.
The WF1973/WF1974 is automatically grounded when the 3-prong power plug is connected
to a 3-prong power outlet with a protective grounding contact.
This product does not come with a 3-prong to 2-prong conversion adapter. When using a
separately sold 3-prong to 2-prong conversion adapter, be sure to connect the (green)
grounding wire of the adapter to the grounding terminal next to the outlet.
●Check the power supply voltage.
This product operates on the power supply voltage shown in 2.3 Grounding and Power
Supply Connection in the Basics Instruction Manual.
Prior to connecting the power supply, check that the voltage of the power supply matches
the rated power supply of the product.
●In case of suspected anomaly
If this product emits smoke, an abnormal smell, or abnormal noise, immediately power it off
and stop using it.
If such an anomaly occurs, do not use this product until it has been repaired, and
immediately report the problem to the location of purchase (either NF Corporation or your
distributor).
●Do not use this product when gas is present.
An explosion or other such hazard may result.
●Do not remove the cover.
This product contains high-voltage parts. Absolutely never remove its cover.
Even when the inside of this product needs to be inspected, do not touch the inside. All such
inspections are to be performed by service technicians designated by NF Corporation.
●Do not modify this product.
Absolutely never modify this product, as this may cause new hazards and may disqualify
this product from repair in case of failure.
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