1. Precautions
Follow these safety, servicing and ESD precautions to prevent damage and protect against potential hazards
such as electrical shock and X-rays.
Samsung Electronics
1-1
1-1 Safety 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 protective
devices, including 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.
4. Design Alteration Warning:
Never alter or add to the mechanical or
electrical design of the unit. Example: Do
not add auxiliary audio or video connec-
tors. Such alterations might create a safety
hazard. Also, any design changes or addi-
tions will void the manufacturer's warran-
ty.
5. 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 (ANSI C101.1, Leakage Current for
Appliances), and Underwriters Laboratories
(UL Publication UL1410, 59.7).
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, etc.) and all exposed
metal parts. Examples: 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.
6. Insulation Resistance Cold Check:
(1) With the unit's AC plug disconnected
from the AC source, connect an electrical
jumper across the two AC prongs. (2) Set
the power switch to ON. (3) Measure the
resistance between the shorted AC plug and
any exposed metallic parts. Example:
Screwheads, antenna, control shafts or
handle brackets.
If any of the exposed metallic parts has a
return path to the chassis, the measured
resistance should be between 1 and 5.2
megohms. If there is no return path, the
measured resistance should be "infinite." If
the resistance is outside these limits, a shock
hazard might exist. See Figure 1-2
Device
Under
Test
(Reading should
not be above
0.5mA)
Leakage
Currant
Tester
Earth
Ground
Test all
exposed metal
surfaces
Also test with
plug reversed
(using AC adapter
plug as required)
2-Wire Cord
Antenna
Terminal
Exposed
Metal Part
ohm
Ohmmeter
Fig. 1-1 AC Leakage Test
Fig. 1-2 Insulation Resistance Test
Summary of Contents for HT-X250
Page 2: ... Samsung Electronics Co Ltd JAN 2007 Printed in Korea Code no AH68 000000 ELECTRONICS ...
Page 20: ...5 4 Samsung Electronics D Separate MAIN SET ...
Page 22: ...6 1 Samsung Electronics 6 TroubleShooting 1 Main ...
Page 23: ...Samsung Electronics 6 2 2 Output ...
Page 24: ...6 3 Samsung Electronics 3 1 In case of Power Protection ...
Page 25: ...Samsung Electronics 6 4 3 2 SMPS Ass y Power check ...
Page 26: ...6 5 Samsung Electronics 3 3 AMP Pre Inspection relating to Power Protection ...
Page 27: ...Samsung Electronics 6 6 4 FAN Error Check ...
Page 28: ...6 7 Samsung Electronics 5 FAN CHECK Error ...
Page 29: ...Samsung Electronics 6 8 6 1 Communication Failure ...
Page 30: ...6 9 Samsung Electronics 6 2 Voltage Failure ...
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Page 32: ...6 11 Samsung Electronics 6 3 Communication Failure ...
Page 33: ...Samsung Electronics 6 12 7 Checking out AMP PCB ...
Page 34: ...6 13 Samsung Electronics 8 AMP PCB Short Check flow ...
Page 47: ...9 1 Samsung Electronics 9 Block Diagram 1 Block ...
Page 48: ...Samsung Electronics 10 1 10 Wiring Diagram 1 Wire Sheet ...
Page 49: ...10 2 Samsung Electronics 2 GND ...
Page 50: ...Samsung Electronics 10 3 3 VDD ...
Page 51: ...10 4 Samsung Electronics 4 SMPS ...
Page 52: ...11 1 Samsung Electronics 11 PCB Diagram 1 MAIN PCB ...
Page 53: ...Samsung Electronics 11 2 2 MAIN PCB Description ...
Page 54: ...11 3 Samsung Electronics 2 MAIN PCB Description ...
Page 55: ...Samsung Electronics 11 4 3 SMPS PCB ...
Page 64: ...Samsung Electronics 12 9 This Document can not be used without Samsung s authorization 2 KEY ...
Page 66: ...13 1 Samsung Electronics 13 Circuit Board Description 1 PCB Assy Layout 1 HT X250 X200 ...
Page 67: ...Samsung Electronics 13 2 2 Functional Description SMPS Main Front ...
Page 68: ...13 3 Samsung Electronics 3 Functional Description Amp HDMI Video ...
Page 69: ...Samsung Electronics 13 4 4 1 MAIN PCB Block 4 2 MAIN PCB Connectors ...
Page 70: ...13 5 Samsung Electronics 5 MAIN PCB HDMI VIDEO OUT ...
Page 71: ...Samsung Electronics 13 6 6 1 SUB PCB Block 6 2 SUB PCB Connectors ...
Page 72: ...13 7 Samsung Electronics 7 AMP PCB Block ...
