Safety Precautions; Insulation Resistance Test; For Service Technicians - Panasonic KX-FT21BX Service Manual

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Table of Contents

1. Before servicing, unplug the AC power cord to prevent an electric shock.

2. When replacing parts, use only the manufacturer's recommended components.

3. Check the condition of the power cord. Replace if wear or damage is evident.

4. After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc.

5. Before returning the serviced equipment to the customer, be sure to perform the following insulation resistance test to

prevent the customer from being exposed to shock hazards.

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 an ohmmeter between the jumpered AC plug and each exposed metal cabinet part

(screwheads, control shafts, bottom frame, 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 a shock hazard.

The equipment should be repaired and rechecked before it is returned to the customer.

Exposed

metal

part

ICs and LSIs are vulnerable to static electricity.

When repairing, the following precautions will help prevent recurring malfunctions.

1) Cover the plastic part's boxes with aluminum foil.

2) Ground the soldering irons.

3) Use a conductive mat on the worktable.

4) Do not touch the IC or LSI pins with bare fingers.