Схема видеокамеры Other SAMSUNG DV7720V, DV7700KV, DV4720V, DV4700V

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Samsung Electronics
1. Precautions
1. Be sure that all of the built-in protective
devices are replaced.
2. When reinstalling the chassis and its
assemblies, be sure to restore all protectivedevices, including control knobs andcompartment covers.
3. Make sure that there are no cabinet
openings through which people--particularly children--might insert fingersand contact dangerous voltages. Suchopenings include the spacing between thepicture tube and the cabinet mask,excessively wide cabinet ventilation slots,and improperly fitted back covers.
4. Design Alteration Warning:
Never alter or add to the mechanical orelectrical design of the unit. Example: Donot add auxiliary audio or videoconnectors. Such alterations might createa safety hazard. Also, any design changesor additions will void the manufacturer'swarranty.
5. Leakage Current Hot Check (Figure 1-1):
Warning: Do not use an isolationtransformer during this test. Use a leakage-current tester or a metering system thatcomplies with American National StandardsInstitute (ANSI C101.1, Leakage Current forAppliances), and Underwriters Laboratories(UL Publication UL1410, 59.7).
With the unit completely reassembled, plugthe AC line cord directly into a 120V ACoutlet. With the unit's AC switch first in theON position and then OFF, measure thecurrent between a known earth ground(metal water pipe, etc.) and all exposedmetal parts. Examples: Handle brackets,metal cabinets, screwheads and controlshafts. The current measured should notexceed 0.5 milliamp. Reverse the power-plug prongs in the AC outlet and repeat.
6. Insulation Resistance Cold Check:
(1) With the unit's AC plug disconnectedfrom the AC source, connect an electricaljumper across the two AC prongs. (2) Setthe power switch to ON. (3) Measure theresistance between the shorted AC plug andany exposed metallic parts. Example:Screwheads, antenna, control shafts orhandle brackets.
If any of the exposed metallic parts has areturn path to the chassis, the measuredresistance should be between 1 and 5.2megohms. If there is no return path, themeasured resistance should be "infinite." Ifthe resistance is outside these limits, a shockhazard might exist. See Figure 1-2
1-1 Safety Precautions
Follow these safety, servicing and ESD precautions to prevent damage and protect against potential hazardssuch as electrical shock and X-rays.
DeviceUnder
(Reading shouldnot be above0.5mA)
LeakageCurrantTester
EarthGround
exposed metal
Also test withplug reversed(using AC adapterplug as required)
2-Wire Cord
Fig. 1-1 AC Leakage Test
AntennaTerminal
ExposedMetal Part
Fig. 1-2 Insulation Resistance Test