(This “Safety Precaution” is applied only in U.S.A.)
1.1.2. Leakage Current Hot Check
1 Safety Precautions
1.1. 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, ensure that all the protective devices such as insulation barriers, insulation papers shields are properly installed.
3. After servicing, check for leakage current checks to prevent from being exposed to shock hazards.
1. Before servicing, unplug the power cord to prevent an electric shock.
2. When replacing parts, use only manufacturer’s recommended components for safety.
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 make the following insulation resistance test to prevent the
customer from being exposed to a shock hazard.
1.1.1. Leakage Current Cold Check
1. Unplug the AC cord and connect a jumper between the two prongs on the plug.
2. Using an ohmmeter measure the resistance value, 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 between 1M
Ω
and 5.2
Ω
.
When the exposed metal does not have a return path to the chassis, the reading must be
.
1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.
2. Connect a 1.5k
Ω
, 10 watts resistor, in parallel with a 0.15µF 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. should the measurement is outside of the limits
specified, there is a possibility of a shock hazard, and the equipment should be repaired and re-checked before it is returned
to the customer.
Fig. 1
4
SA-NS55P
Summary of Contents for SA-NS55P
Page 6: ...1 5 Caution for fuse replacement 6 SA NS55P ...
Page 13: ...7 3 Disc Information 13 SA NS55P ...
Page 21: ...9 3 Main Parts Location Diagram 21 SA NS55P ...
Page 34: ... Disassembly of gears drive 34 SA NS55P ...
Page 35: ...35 SA NS55P ...
Page 37: ...37 SA NS55P ...
Page 39: ...10 2 Checking and Repairing of Panel P C B 39 SA NS55P ...
Page 40: ...10 3 Checking and Repairing of Switch and Motor P C B 40 SA NS55P ...
Page 41: ...10 4 Checking and Repairing Transformer P C B 41 SA NS55P ...
Page 42: ...10 5 Checking and Repairing Power and AC Inlet P C B 42 SA NS55P ...
Page 43: ...10 6 Checking and Repairing Main P C B 43 SA NS55P ...
Page 44: ...10 7 Checking and Repairing CD Servo P C B 44 SA NS55P ...
Page 52: ...SA NS55P 52 ...
Page 56: ...SA NS55P 56 ...
Page 58: ...58 SA NS55P ...
Page 77: ...19 Exploded Views 19 1 Cabinet Parts Location Traverse Part Location SA NS55P 77 ...
Page 78: ...SA NS55P 78 ...
Page 79: ...19 2 Packaging SA NS55P 79 ...
Page 80: ...SA NS55P 80 ...