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PRECAUTIONS
SAFETY PRECAUTIONS
4715
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 4715
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 CTC203AY1/Y7)
Model 27GT716YX1 (Chassis CTC203AY1/Y7)
manufacturer. When servicing the receiver, use an isolation transformer resistance between the jumped AC plug and any exposed metal cabinet Error Codes Chart .................................. 1
4715
parts such as antenna screw heads, control shafts, or handle brackets. GridTrace Location
4715
between the line cord and power receptacle.
Exposed metal parts with a return path should measure between 1M Main Board ..................................... 4
SERVICING THE HIGH VOLTAGE AND CRT
SERVICING OLT CRT ohms and 5.2M ohms. Parts without a return path must measure infinity.
High Voltage Shutdown Test .................. 1
Use EXTREME CAUTION when servicing the high voltage circuits. To
Leakag Check
Hot Leakage Current Check IC Functions ........................................... 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 Important Parts Information ................... 2
the CRT by the neck. Always wear shatterproof goggles when handling transformer. Use a 1500 ohms, 10W resistor in parallel with a .15