Samsung DVD-L200W service manual Test, Wire Cord, Not be Above, Earth Ground

1. Precautions

1-1 Safety Precautions

1)Before returning an instrument to the customer, always make a safety check of the entire instrument, including, but not limited to, the following items:

Any measurements not within the limits specified herein indicate a potential shock hazard that must be eliminated before returning the instrument to the customer.

(1) Be sure that no built-in protective devices are

defective or have been defeated during servicing.

(1)Protective shields are provided to protect both

the technician and the customer. Correctly replace

all missing protective shields, including any

removed for servicing convenience.

(2)When reinstalling the chassis and/or other as-

sembly in the cabinet, be sure to put back in place

all protective devices, including, but not limited to,

nonmetallic control knobs, insulating fish papers,

adjustment and compartment covers/shields, and

isolation resistor/capacitor networks. Do not oper-

ate this instrument or permit it to be operated with-

out all protective devices correctly installed and

DEVICE			LEAKAGE
			CURRENT
UNDER				TESTER
TEST
		TEST ALL
	EXPOSED METER
		SURFACES

2-WIRE CORD

ALSO TEST WITH PLUG REVERSED (USING AC ADAPTER PLUG AS REQUIRED)

(READING SHOULD

NOT BE ABOVE

0.5mA)

EARTH

GROUND

functioning.

(2) Be sure that there are no cabinet openings through

which adults or children might be able to insert

their fingers and contact a hazardous voltage. Such

openings include, but are not limited to, excessive-

ly wide cabinet ventilation slots, and an improper-

ly fitted and/or incorrectly secured cabinet back

cover.

(3) Leakage Current Hot Check-With the instrument

completely reassembled, plug the AC line cord

directly into a 120V AC outlet. (Do not use an iso-

lation transformer during this test.) Use a leakage

current tester or a metering system that complies

with American National Standards institute (ANSI)

C101.1 Leakage Current for Appliances and

Underwriters Laboratories (UL) 1270 (40.7). With

the instrument’s AC switch first in the ON position

and then in the OFF position, measure from a

known earth ground (metal water pipe, conduit,

etc.) to all exposed metal parts of the instrument

(antennas, handle brackets, metal cabinets, screw-

heads, metallic overlays, control shafts, etc.), espe-

cially any exposed metal parts that offer an electri-

cal return path to the chassis.

Any current measured must not exceed 0.5mA.

Reverse the instrument power cord plug in the out-

let and repeat the test. See Fig. 1-1.

Fig. 1-1 AC Leakage Test

(4)Insulation Resistance Test Cold Check-(1) Unplug the power supply cord and connect a jumper wire between the two prongs of the plug. (2) Turn on the power switch of the instrument. (3) Measure the resistance with an ohmmeter between the jumpered AC plug and all exposed metallic cabinet parts on the instrument, such as screwheads, antenna, control shafts, handle brackets, etc. When an exposed metallic part has a return path to the chassis, the reading should be between 1 and 5.2 megohm. When there is no return path to the chas- sis, the reading must be infinite. If the reading is not within the limits specified, there is the possibil- ity of a shock hazard, and the instrument must be repaired and rechecked before it is returned to the customer. See Fig. 1-2.

Antenna

Terminal

Exposed

Metal Part

ohm

ohmmeter

Fig. 1-2 Insulation Resistance Test

Samsung Electronics 1-1