Panasonic KV-S6050W, Service Manual

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5. Before returning the serviced equipment to the customer, perform
the following electrical tests to prevent a shock hazard.
1.2. Electrical Tests
1. Unplug the power cord and check for continuity between the earth
ground connection on the plug and the metal cabinet. There
should be zero ohm resistance found.
2. With the unit unplugged, short the AC Live-Neutral of the plug with
a jumper wire.
3. Turn ON the power switch.
4. Measure the resistance value with an ohmmeter between the
jumpered AC plug and each exposed metal cabinet part, such as
screwheads, etc.
Note:
Some exposed parts may be isolated from the chassis by design.
They read infinity.
5. If the measurement is less than 1 M , a possibility for electric
shock may exit.
Note:
This hazardous condition must be corrected before the unit is
returned to the end user.
1.3. For Service Technicians
ICs and LSIs are vulnerable to static electricity.
When repairing, the following precautions will help to prevent recurring malfunctions.
1. Cover the plastic parts with aluminum foil.
2. Ground the soldering irons.
3. Use a conductive mat on the worktable.
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