Kortek corporation
5
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99
PDP R&D Center
7. X-ray Limits: The picture tube is especially designed to prohibit X-ray emissions. To ensure continued X-
ray protection, replace the picture tube shieds and mounting hardware; these also provide X-ray protection.
8. High Voltage Limits: High voltage must be measured each time servicing 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 must 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.
9. 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.
10. Design Aleration 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.
11. 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.
12. Some TV chassis have a secondary ground system in addition to the main chassis ground. This secondary
ground system is not isolated from the AC power line. The two ground systems are electrically separated
by insulating material that must not be defeated or altered.
13. Components, parts and wiring that appear to have overheated or that are otherwise damaged should be
replaced with parts that meet the original specifications. Always determine the cause of damage or
overheating, and correct any potential hazards.
14. 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.
15. Picture Tube Implosion Warning: The picture tube in this receiver empolys “integral implosion” protection.
To ensure continued implosion protection, make sure that the replacement picture tube is the same as the
original.
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