Service Manuals, User Guides, Schematic Diagrams or docs for : RCA TV RCA 27GT720TX1

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RCA 27GT720TX1


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                                                   SAFETY PRECAUTIONS
                                                                                                                                                                                                                                                                                                   4776
                                                                                                                                                                                                                                                                               Technical Service Data
SERVICE WARNING                                                                   SAFETY CHECKS -- FIRE AND SHOCK HAZARD
Only qualified service technicians who are familiar with safety checks            Cold Leakage Checks for Receivers with Isolated Ground
                                                                                                                                                                                                                                                                                                   GE




                                                                                                                                                                      SET 4776
and guidelines should perform service work. Before replacing parts,                                                                                                                                                                     INDEX
                                                                                  Unplug the AC cord, connect a jumper across the plug prongs, and turn
disconnect power source to protect electrostatically sensitive parts. Do
                                                                                  the power switch on (if applicable). Use an ohmmeter to measure the                                                                                                                             Model 27GT720TX1 (Chassis CTC203AX)
not attempt to modify any circuit unless so recommended by the
manufacturer. When servicing the receiver, use an isolation transformer           resistance between the jumped AC plug and any exposed metal cabinet                                                       GridTrace Location




                                                                                                                                                               4776
                                                                                  parts such as antenna screw heads, control shafts, or handle brackets.                                                        Main Board .....................................           4




                                                                                                                                                                                                                                                                                                                          4776
between the line cord and power receptacle.
                                                                                  Exposed metal parts with a return path should measure between 1M
SERVICING THE HIGH VOLTAGE AND CRT                                                ohms and 5.2M ohms. Parts without a return path must measure infinity.
                                                                                                                                                                                                            High Voltage Shutdown Test ..................                  1
                                                                                                                                                                                                            IC Functions ...........................................       2
Use EXTREME CAUTION when servicing the high voltage circuits. To
                                                                                  Hot Leakage Current Check                                                                                                 Important Parts Information ...................                4
discharge static high voltage, connect a 10K ohms resistor in series with a
test lead between the receiver ground and CRT anode lead. DO NOT lift             Plug the AC cord directly into an AC outlet. DO NOT use an isolation                                                      Miscellaneous Adjustments ...................                  1
the CRT by the neck. Always wear shatterproof goggles when handling               transformer. Use a 1500 ohms, 10W resistor in parallel with a .15



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