Samsung CKA4217L Service Manual page 4

1 Precautions
1-1-3 Fire and Shock Hazard
Before returning the monitor to the user, perform
the following safety checks:
1. Inspect each lead dress to make certain that
the leads are not pinched or that hardware is
not lodged between the chassis and other
metal parts in the monitor.
2. Inspect all protective devices such as
nonmetallic control knobs, insulating
materials, cabinet backs, adjustment and
compartment covers or shields, isolation
resistor-capacitor networks, mechanical
insulators, etc.
DEVICE
UNDER
TEST
EXPOSED METAL
2-WIRE CORD
ALSO TEST WITH
PLUG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED)
Figure1-1. Leakage Current Test Circuit
1-2
(READING SHOULD
NOT BE ABOVE 0.5mA)
LEAKAGE
CURRENT
TESTER
TEST ALL
SURFACES
EARTH
GROUND
3. Leakage Current Hot Check (Figure 1-1):
WARNING: Do not use an isolation transformer
during this test.
Use a leakage current tester or a metering
system that complies with American National
Standards Institute
Current for Appliances), and Underwriters
Laboratories (UL Publication UL1410, 59.7).
4. With the unit completely reassembled, plug
the AC line cord directly into a 120V AC
outlet. With the unit's 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: 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.
1-1-4 Product Safety Notices
Some electrical and mechanical parts have special
safety-related characteristics which are often not
evident from visual inspection. The protection
they give may not be obtained by replacing them
with components rated for higher voltage,
wattage, etc. Parts that have special safety
characteristics are identified by
and parts lists. Asubstitute replacement that does
not have the same safety characteristics as the
recommended replacement part might create
shock, fire and / or other hazards. Product safety
is under review continuously and new
instructions are issued whenever appropriate.
Components identified by
parts lists must be sealed by a soldering iron after
replacement and adjustment.
(ANSI C101.1, Leakage
on schmatics
!
on schematics and
CKA42*7L/5227L