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PRECAUTIONS
SAFETY PRECAUTIONS
4631
Technical Service Data
SERVICE
SERVICE WARNING SAFETY CHECKS -- FIRE AND SHOCK HAZARD
Only qualified service technicians who are familiar with safety checks Leakag Checks for Receivers Ground
Cold Leakage Checks for Receivers with Isolated Ground
GE




SET 4631
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
not attempt to modify any circuit unless so recommended by the the power switch on (if applicable). Use an ohmmeter to measure the Model 27GT630TX51 (Chassis CTC203AA5)
manufacturer. When servicing the receiver, use an isolation transformer resistance between the jumped AC plug and any exposed metal cabinet Error Codes Chart .................................. 1
between the line cord and power receptacle. parts such as antenna screw heads, control shafts, or handle brackets. High Voltage Shutdown Test .................. 1
Exposed metal parts with a return path should measure between 1M IC Functions ........................................... 2
SERVICING THE HIGH VOLTAGE AND CRT
SERVICING OLT CRT ohms and 5.2M ohms. Parts without a return path must measure infinity.
Important Parts Information ................... 1
Use EXTREME CAUTION when servicing the high voltage circuits. To
Leakag Check
Hot Leakage Current Check Miscellaneous Adjustments .................... 1
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 Parts List ................................................. 4
the CRT by the neck. Always wear shatterproof goggles when handling transformer. Use a 1500 ohms, 10W resistor in parallel with a .15