Safety Precautions
General Guidelines
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 leakage current checks to prevent the customer from being exposed to
shock hazards.
4. When conducting repairs and servicing, do not attempt to modify the equipment, its parts or its materials.
5. When wiring units (with cables, flexible cables or lead wires) are supplied as repair parts and only one wire or
some of the wires have been broken or disconnected, do not attempt to repair or re-wire the units. Replace the
entire wiring unit instead.
6. When conducting repairs and servicing, do not twist the Faston connectors but plug them straight in or unplug
them straight out.
1.1.1. Leakage Current Cold Check
1. Unplug the AC cord and connect a jumper between
the two prongs on 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 the
chassis, the reading should be 100 Mohm and
over. When the exposed metal does not have a
return path to the chassis, the reading must be
.
1.1.2. Leakage Current Hot Check (See Figure 1.)
1. Plug the AC cord directly into the AC outlet. Do
not use an isolation transformer for this check.
2. Connect a 1.5kohm, 10 watts resistor, in parallel
with 0.15
μ
F capacitors, between each exposed
metallic part on the set and a good earth ground
such as a water pipe, as shown in Figure 1.
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
must not exceed 1/2 milliamp. In case a
measurement is outside 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.
Figure 1
3