Samsung CS21M20MQZXBWT, Service Manual

1. Precautions

1-1 Safety Precautions

1. Be sure that all of the built-in protective

devices are replaced.  Restore any missing
protective shields.

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 people—particularly 
children—might 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 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 (ANIS  C101.1, Leakage Current for
Appliances), and Underwriters Laboratories
(UL Publication UL1410, 59.7).

5. With the unit completely reassembled, plug

the AC line cord directly into the power 
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: 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.

Fig. 1-1 AC Leakage Test

6. Antenna Cold Check:  

With the unit’s 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

“horizontal disable” or “hold-down”.)

Heed the high voltage limits. These include
the X–ray Protection Specifications Label, and
the Product Safety and X-ray Warning Note on
the service data  schematic.

Precautions

1-1

LEAKAGE

CURRENT

TESTER

DEVICE
UNDER

TEST

TEST ALL

EXPOSED METAL

SURFACES

2-WIRE CORD

ALSO TEST WITH

PLUG REVERSED

(USING AC ADAPTER

PLUG AS REQUIRED)

EARTH

GROUND

(READING SHOULD

NOT BE ABOVE

0.5mA)

Follow these safety, servicing and ESD precautions to prevent damage and protect against potential
hazards such as electrical shock and X-rays.