Samsung VR400PVR400PC, Manual

Precautions

1-2

Samsung Electronics

11. High voltage is maintained within specified limits

by close-tolerance, safety-related components and
adjustments. If the high voltage exceeds the 
specified limits, check each of the special 
components.

12. Design Alteration Warning :

Never alter or add to the mechanical or electrical
design of this unit. Example : Do not add 
auxiliary audio or video connectors. 
Such alterations might create a safety hazard.
Also, any design changes or additions will void
the manufacturer’s warranty.

13. Hot Chassis Warning : 

Some TV receiver chassis are electrically 
connected directly to one conductor of the AC
power cord. If an isolation transformer is not
used, these units may be safely serviced only if
the AC power plug is inserted so that the chassis
is connected to the ground side of the AC source.

To confirm that the AC power plug is inserted
correctly, do the following : Using an AC 
voltmeter, measure the voltage between the 
chassis and a known earth ground. If the reading
is greater than 1.0V, remove the AC power plug,
reverse its polarity and reinsert. Re-measure the
voltage between the chassis and ground.

14. Some TV chassis are designed to operate with 85

volts AC between chassis and ground, regardless
of the AC plug polarity. These units can be safely
serviced only if an isolation transformer inserted
between the receiver and the power source.

15. Never defeat any of the B+ voltage interlocks. 

Do not apply AC power to the unit (or any of its
assemblies) unless all solid-state heat sinks are
correctly installed.

16. Always connect a test instrument’s ground lead to

the instrument chassis ground before connecting
the positive lead; always remove the instrument’s
ground lead last.

17. Observe the original lead dress, especially near

the following areas : Antenna wiring, sharp 
edges, and especially the AC and high voltage
power supplies. Always inspect for pinched, out-
of-place, or frayed wiring. Do not change the
spacing between components and the printed
circuit board. Check the AC power cord for 
damage. Make sure that leads and components 
do not touch thermally hot parts.

18. Picture Tube Implosion Warning : 

The picture tube in this receiver employs 
“integral implosion” protection. To ensure 
continued implosion protection, make sure that
the replacement picture tube is the same as the
original.

19. Do not remove, install or handle the picture tube

without first putting on shatterproof goggles
equipped with side shields. Never handle the 
picture tube by its neck. Some “in-line” picture
tubes are equipped with a permanently attached
deflection yoke; do not try to remove such 
“permanently attached” yokes from the picture
tube.

20. Product Safety Notice :

Some electrical and mechanical parts have special
safety-related characteristics which might not be
obvious from visual inspection. These safety 
features and the protection they give might be 
lost if the replacement component differs from the
original--even if the replacement is rated for 
higher voltage, wattage, etc.

Components that are critical for safety are 
indicated in the circuit diagram by shading, 
(       or       ).
Use replacement components that have the same
ratings, especially for flame resistance and 
dielectric strength specifications. A replacement
part that does not have the same safety 
characteristics as the original might create shock,
fire or other hazards.