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 Safety Precautions
 General Guide Lines
1.   When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated
     or damaged by the short circuit.
2.   After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly
     installed.
3.   After servicing, make the following touch current checks to prevent the customer from being exposed to shock hazards.
4.   Always ensure cover label TBM4GU113 is correctly replaced before returning to customer (see Fig.1).




                                                                             Fig. 1



Touch-Current Check
1.   Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.
2.   Connect a measuring network for touch currents between each exposed metallic part on the set and a good earth
     ground such as a water pipe, as shown in Fig. 2.
3.   Use Leakage Current Tester (Simpson 228 or equivalent) to measure the potential across the measuring network.
4.   Check each exposed metallic part, and measure the voltage at each point.
5.   Reserve the AC plug in the AC outlet and repeat each of the above measure.
6.   The potential at any point (TOUCH CURRENT) expressed as voltage U1 and U2, does not exceed the following values:
     For a. c.: U1 = 35 V (peak) and U2 = 0.35 V (peak);
     For d. c.: U1 = 1.0 V,
     Note:
     The limit value of U2 = 0.35 V (peak) for a. c. and U1 = 1.0 V for d. c. correspond to the values 0.7 mA (peak) a. c. and
     2.0 mA d. c.
     The limit value U1 = 35 V (peak) for a. c. correspond to the value 70 mA (peak) a. c. for frequencies greater than 100
     kHz.
7.   In case a measurement is out of the limits specified, there is a possibility of a shock hazard, and the equipment should
     be repaired and rechecked before it is returned to the customer.




                                                    Measuring network for TOUCH CURRENTS
                          COLD
                          WATER PIPE
                          (EARTH GROUND)


                                                           RS=1500            CS=0.22F

                                                                                      10k

                          TO
                          APPLIANCES
                          EXPOSED
                                                                   R0=500         U1 (V)         0.022F           V        U2 (V)
                          METAL PARTS
                     Resistance values in ohms ()
                     V: Voltmeter or oscilloscope    Input resistance: 1M
                      (r.m.s. or peak reading)       Input capacitance:200pF
                                                     Frequency range: 15Hz to 1MHz and d.c.respectively

                     NOTE 

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