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TX_TVD809 TX_TVD809
11/03 SAFETY PRECAUTIONS
TX_TVD809 DO NOT OPERATE THIS INSTRUMENT OR PERMIT IT TO BE OPER- Do not remove, install, or otherwise handle the picture tube in any manner with-
ATED WITHOUT ALL PROTECTIVE DEVICES INSTALLED AND out first putting on shatterproof goggles equipped with side shields. People not so
FUNCTIONING. SERVICERS WHO DEFEAT SAFETY FEATURES OR equipped must be kept safely away while picture tubes are handled. Keep the
F20TF10, F19425 FAIL TO PERFORM SAFETY CHECKS MAY BE LIABLE FOR ANY picture tube away from your body. Do not handle the picture tube by its neck.
Television F19426, F19431, F19436
RESULTING DAMAGE, AND MAY EXPOSE THEMSELVES AND OTH-
ERS TO POSSIBLE INJURY.
Some "in-line" picture tubes are equipped with a permanently attached deflection
yoke; because of potential hazard, do not try to remove such "permanently at-
tached" yokes from the picture tube.
BD20TF10, 13V110TD READ AND COMPLY WITH ALL CAUTION AND SAFETY-RELATED
Basic Service Data NOTES ON OR INSIDE THE RECEIVER CABINET, AND THE RE-
CEIVER CHASSIS, OR ON THE PICTURE TUBE.
X-RADIATION AND HIGH VOLTAGE LIMITS - Because the picture
tube is the primary source of X-radiation in solid-state TV receivers, it is specially
constructed to prohibit X-radiation emissions. For continued X-radiation protec-
SAFETY GLASSES SHOULD BE USED WHEN SERVICING ELEC-
TRONIC INSTRUMENTS. INADVERTENTLY OVERSTRESSING COM- tion, a replacement picture tube must be the same type as the original. The picture
PONENTS MAY CAUSE THEM TO SHATTER, DISCHARGING SMALL shields, mounting hardware and lenses (projection TV) may also perform an X-
Technical Publications PARTICLES. radiation protection function, and they must be correctly in place. Anode connec-
P.O.Box 1976 / Indianapolis, Indiana 46206 tors contain an X-radiation shield - use only the manufacturer's specified anode
DESIGN ALTERATION WARNING - Do not alter or add to the mechanical or connectors. High voltage must be measured each time servicing that involves
electrical design of this TV receiver. Design alterations and additions may alter power supply, horizontal deflection or high voltage circuits is performed. Correct
the safety characteristics of this receiver and create a hazard to the user. Design operation of the X-radiation circuits must also be confirmed each time these cir-
alterations or additions may void the manufacturer's warranty and may make you, cuits are serviced (X-radiation circuits may also be called "horizontal disable" or
SERVICE DATA INDEX the servicer, responsible for personal injury or property damage resulting there-
from.
"hold-down" circuits). Read and apply high voltage limits and, if the chassis is so
Page equipped, the X-radiation protection circuit specifications. These limits and speci-
BEFORE RETURNING AN INSTRUMENT TO THE CUSTOMER, always fications are given on instrument labels and are included in this service data. High
Number make a safety check of the entire instrument, including, but not limited to, the voltage is maintained within specified limits by close-tolerance safety-related com-
Electrical Alignment Procedures ...................................................................................... 3-1 following items: ponents (and adjustments) in the high voltage circuit. If high voltage exceeds
Block Diagrams FIRE AND SHOCK HAZARD specified limits, check each safety related component specified on the schematic
Interconnect Diagram (TX809) ....................................................................................... 8-1 and take corrective action.
1. Never release a repaired unit unless all protective devices such as insula-
Interconnect Diagram (TVD809) .................................................................................... 8-2 tors, barriers, covers, strain reliefs and other protective hardware have been ANTENNA LEAKAGE RESISTANCE CHECK - With the instrument AC
Circuit Boards .................................................................................................................... 10-1 installed in accordance with the original design. plug removed from the AC source, connect an electrical jumper across the two AC
plug prongs. Place the instrument AC switch (if applicable) in the "on" position.
Disassembly 2. Be sure that there are no cabinet openings through which an adult or a child Connect one lead of an ohmmeter to the AC plug prongs and touch the other
Instrument Disassembly .................................................................................................. 2-1 might be able to insert their fingers and contact a hazardous voltage. Such ohmmeter lead, in turn, to each (exposed) antenna input terminal screw and/or
Component Removal ....................................................................................................... 2-2 openings include, but are not limited to: (a) spacing between picture tube coaxial connector. If the measured resistance is less than 1.0 Megohm, or greater
and cabinet mask, (b) excessively wide cabinet ventilation slots, and (c) an than 5.2 Megohm, an abnormality exists which must be corrected before the in-
General Information improperly fitted or incorrectly secured back cover.
Model to Major Assembly Cross Reference .................................................................... 1-3 strument is returned to the customer. Repeat this test with the AC switch in the
3. Observe original lead dress. Take care to restore leads to their original "off" position.
Safety Precautions ........................................................................................................... 1-2 dress. Make sure that leads are not in contact with sharp edges or thermally
Schematic Notes .............................................................................................................. 1-4 hot parts. Always inspect in all areas for pinched, out-of-place or frayed
Specifications .................................................................................................................. 1-3 wiring. Do not change spacing between adjacent components, or between
Schematic Diagrams components and printed circuit board. Check the AC power cord for dam-
Power Supply .................................................................................................................. 9-1 age.
Deflection ........................................................................................................................ 9-2 4. Be certain to remove loose solder balls and all other loose foreign particles.
System Control ................................................................................................................ 9-3 5. Check components, parts and/or wiring for physical evidence of damage,
Gemstar ........................................................................................................................... 9-4 overheating or deterioration, and replace if necessary. Determine the cause
of damage and/or overheating and, if necessary, take corrective action to
uP Controller (F19425, F19431) ..................................................................................... 9-5 remove any potential safety hazard.
Tuner ............................................................................................................................... 9-6
6. Parts Replacement - Many TV electrical and mechanical parts have special
Video ............................................................................................................................... 9-7 safety-related characteristics, some of which are often not evident from vi-
Kine Driver ...................................................................................................................... 9-8 sual inspection, and the protection they give cannot necessarily be obtained
Kine Driver (F19425, F19431) ........................................................................................ 9-9 by replacing them with components rated for higher voltage, wattage, etc.
DVD (Connectors) .......................................................................................................... 9-10 Parts that have special safety characteristics are identified in this service
data by a ( ) on schematics and in the parts list. Use of a substitute
Keyboard/FAV (20V) ...................................................................................................... 9-11
replacement that does not have the same safety characteristics as the recom-
Keyboard/FAV (13V) ...................................................................................................... 9-12 mended replacement part in the service data parts list may create shock, fire LEAKAGE CURRENT HOT CHECK FOR 2-WIRE OR 3-WIRE
Audio (IF, TVB) (BD20TF10) ........................................................................................ 9-13 and/or other hazards. Always consult the appropriate current service litera- GROUNDED CORD SETS - With the instrument completely reassembled,
Audio (Output) (BD20TF10) .......................................................................................... 9-14 ture for the latest information. plug the AC line cord into the mains AC outlet at normal line voltage via a non-
Audio (IF, TVB) (13V110TD) ........................................................................................ 9-15 7. Some TV receiver chassis' normally have 85VAC (RMS) between chassis polarized adapter. DO NOT GROUND THE 3RD PRONG OF THE ADAPTER
Audio (Output) (13V110TD) .......................................................................................... 9-16 and earth ground, regardless of the AC plug polarity. Some TV receiver AND DO NOT USE AN ISOLATION TRANSFORMER. Use a leakage current
Audio (IF, TVB) (F20TF10, F19436, F19431) ............................................................... 9-17 chassis' are electrically connected directly to one conductor of the AC power tester or metering system that complies with American National Standards Insti-
cord. Some TV receiver chassis' have a secondary ground system in addi- tute (ANSI) C101.1 Leakage Current for Appliances and with Underwriters Labo-
Audio (Output) (F20TF10, F19436, F19431) ................................................................. 9-18 tion to the main chassis ground. This secondary ground system is not iso- ratories (UL) 1492 (Section 67). With the instrument AC switch first in the "on"
Audio (F19426) .............................................................................................................. 9-19 lated from the AC power line. The two ground systems are electrically position and then in the "off" position, measure from a known earth ground (metal
Audio (F19425) .............................................................................................................. 9-20 separated by insulating material that must not be defeated or altered. Thus, water pipe, conduit, etc.) to all exposed metal parts of the instrument (antennas,
Troubleshooting Aids when servicing any unit always use a separate isolation transformer for the handle bracket, metal cabinet, screwheads, metallic overlays, control shafts, etc.).
Connection Guide ............................................................................................................ 5-1 chassis. Failure to use a separate isolation transformer may expose the Any current measured must not exceed 0.5 milliampere. Reverse the adapter plug
servicer to possible shock hazard, and may cause damage to servicing in- in the outlet and repeat the test. ANY MEASUREMENTS NOT WITHIN THE
Lead Dress ....................................................................................................................... 5-3 struments. LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK HAZ-
Voltage Charts ................................................................................................................. 5A-1 ARD THAT MUST BE ELIMINATED BEFORE RETURNING THE IN-
8. Many electronic products use a polarized AC line cord (one wide pin on the
Yoke Wiring Diagram ..................................................................................................... 7-1 plug). Defeating this safety feature may create a potential hazard to the STRUMENT TO THE CUSTOMER OR BEFORE CONNECTING THE
servicer and the user. Extension cords that do not incorporate the polarizing ANTENNA OR ACCESSORIES. If a leakage current tester is not available,
SAFETY NOTICE feature should never be used. connect a 1.5 Kohm, 10 Watt resistor, in parallel with a 0.15