KX-HT82480, KX-HT82470, KX-HT82460 - Panasonic PBX Service Manual (repair manual). Page 4

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1. Unplug the power cord and short the two prongs of the plug with a jumper wire.
2. Turn on the power switch.
3. Measure the resistance value with ohmmeter between the jumpered AC plug and each exposed metal cabinet part, such as

screw threads, control shafts, handle brackets, etc.
Note:

Some exposed parts may be isolated from the chassis by design. These will read infinity.

4. If the measurement is outside the specified limits, there is a possibility of shock hazard. The equipment should be repaired

and rechecked before it is returned to the customer.