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