Prevention Of Electro Static Discharge - Panasonic DVD-RV26 Service Manual

the plug.
2. Measure the resistance value, with an ohmmeter, between the
jumpered AC plug and each exposed metallic cabinet part on the
equipment such as screwheads, connectors, control shafts, etc. When
the exposed metallic part has a return path to thechassis, the reading
should be between 1M
not have a return path to the chassis, the reading must be .
1.1.2. LEAKAGE CURRENT HOT CHECK
1. Plug the AC cord directly into the AC outlet. Do not use an isolation
transformer for this check.
2. Connect a 1.5k
capacitors, between each exposed metallic part on the set and a good
earth ground such as a water pipe, as shown
3. Use an AC voltmeter, with 1000 ohms/volt or more sensitivity, to
measure the potential across the resistor.
4. Check each exposed metallic part, and measure the voltage at each
point.
5. Reverse the AC plug in the AC outlet and repeat each of the above
measurements.
6. The potential at any point should not exceed 0.75 volts RMS. A
leakage current tester (Simpson Model 229 or equivalent) may be used
to make the hot checks, leakage current mu3st not exceed 1/2
milliamp. In case a measurement is outsideof 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.

2. PREVENTION OF ELECTRO STATIC DISCHARGE

(ESD) TO ELECTROSTATICALLY SENSITIVE (ES)
and 5.2M
Figure 1
, 10 watts resistor, in parallel with a 0.15
. / When the exposed metal does
(SeeFigure 1.)
inFigure
4
F
1.