Precautions
1. Precautions
Follow these safety, servicing and ESD precautions to prevent damage and protect against potential hazards such as electrical shock and
1-1 Safety Precautions
1.Be sure that all of the
2.When reinstalling the chassis and its assemblies, be sure to restore all protective devices, including: nonmetallic control knobs and compartment covers.
3.Make sure that there are no cabinet openings through which peopleÑparticularly childrenÑmight insert fingers and contact dangerous voltages. Such openings include the spacing between the picture tube and the cabinet mask, excessively wide cabinet ventilation slots, and improperly fitted back covers.
If the measured resistance is less than 1.0 megohm or greater than 5.2 megohms, an abnormality exists that must be corrected before the unit is returned to the customer.
4.Leakage Current Hot Check (Figure
5.With the unit completely reassembled, plug the AC line cord directly into the power outlet. With the unitÕs AC switch first in the ON position and then OFF, measure the current between a known earth ground (metal water pipe, conduit, etc.) and all exposed metal parts, including: antennas, handle brackets, metal cabinets, screwheads and control shafts. The current measured should not exceed 0.5 milliamp. Reverse the power- plug prongs in the AC outlet and repeat the test.
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| LEAKAGE | NOT BE ABOVE | ||||
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| 0.5mA) | |||
UNDER |
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TEST |
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| TEST ALL |
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| EXPOSED METAL |
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| SURFACES |
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ALSO TEST WITH |
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PLUG REVERSED |
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(USING AC ADAPTER |
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| EARTH | |||
PLUG AS REQUIRED) |
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| GROUND | |||||
Fig. 1-1 AC Leakage Test
6.Antenna Cold Check:
With the unitÕs AC plug disconnected from the AC source, connect an electrical jumper across the two AC prongs. Connect one lead of the ohmmeter to an AC prong. Connect the other lead to the coaxial connector.
7.X-ray Limits:
The picture tube is especially designed to pro- hibit X-ray emissions. To ensure continued X-ray protection, replace the picture tube only with one that is the same type as the original. Carefully reinstall the picture tube shields and mounting hardware; these also provide X-ray protection.
8.High Voltage Limits:
High voltage must be measured each time ser- vicing is done on the B+, horizontal deflection or high voltage circuits. Correct operation of the X-ray protection circuits must be reconfirmed whenever they are serviced. (X-ray protection circuits also may be called Òhorizontal disableÓ or Òhold-downÓ.)
Heed the high voltage limits. These include the XÐray Protection Specifications Label, and the Product Safety and X-ray Warning Note on the service data schematic.
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