GE 27GT716YX1 Manuals

SAFETY PRECA SAFETY PRECA SAFETY PRECA SAFETY PRECA SAFETY PRECAUTIONS UTIONS UTIONS UTIONS UTIONS INDEX INDEX INDEX INDEX INDEX SET 4715 SET 4715 SET 4715 SET 4715 SET 4715 MODEL 27GT716YX1 (CHASSIS CTC203A MODEL 27GT716YX1 (CHASSIS CTC203A MODEL 27GT716YX1 (CHASSIS CTC203A MODEL 27GT716YX1 (CHASSIS CTC203A MODEL 27GT716YX1 (CHASSIS CTC203AY1/Y7) Y1/Y7) Y1/Y7) Y1/Y7) Y1/Y7) GE GE GE GE GE Error Codes Chart .................................. 1 GridTrace Location Main Board ..................................... 4 High Voltage Shutdown Test .................. 1 IC Functions ........................................... 1 Important Parts Information ................... 2 Miscellaneous Adjustments.................... 1 Parts List ................................................. 4 Placement Chart ..................................... 1 Safety Precautions .................................. 1 Schematic Component Location ............ 3 Schematic Notes ..................................... 2 Schematics Audio ............................................... 3 PIP ................................................... 3 Power Supply .................................. 2 System Control ................................ 3 Television ........................................ 2 Test Equipment ....................................... 2 Tuner Information .................................. 1 For Supplier Ad For Supplier Ad For Supplier Ad For Supplier Ad For Supplier Address, dress, dress, dress, dress, See PHO See PHO See PHO See PHO See PHOTTTTTOF OF OF OF OFAAAAACT Ann CT Ann CT Ann CT Ann CT Annual Inde ual Inde ual Inde ual Inde ual Indexxxxx APRIL APRIL APRIL APRIL APRIL 2003 SET 4715 2003 SET 4715 2003 SET 4715 2003 SET 4715 2003 SET 4715 GE GE GE GE GE Model 27GT716YX1 (Chassis CTC203A Model 27GT716YX1 (Chassis CTC203A Model 27GT716YX1 (Chassis CTC203A Model 27GT716YX1 (Chassis CTC203A Model 27GT716YX1 (Chassis CTC203AY1/Y7) Y1/Y7) Y1/Y7) Y1/Y7) Y1/Y7) 4715 Technical Service Data 4715 SER SER SER SER SERVICE VICE VICE VICE VICE WARNING WARNING WARNING WARNING WARNING Only qualified service technicians who are familiar with safety checks and guidelines should perform service work. Before replacing parts, disconnect power source to protect electrostatically sensitive parts. Do not attempt to modify any circuit unless so recommended by the manufacturer. When servicing the receiver, use an isolation transformer between the line cord and power receptacle. SER SER SER SER SERVICING VICING VICING VICING VICING THE HIGH THE HIGH THE HIGH THE HIGH THE HIGH VVVVVOL OL OL OL OLTTTTTAAAAAGE AND CR GE AND CR GE AND CR GE AND CR GE AND CRTTTTT Use EXTREME CAUTION when servicing the high voltage circuits. To 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 the CRT by the neck. Always wear shatterproof goggles when handling the CRT to protect eyes in case of implosion. X-RA X-RA X-RA X-RA X-RAY RADIA Y RADIA Y RADIA Y RADIA Y RADIATION AND HIGH TION AND HIGH TION AND HIGH TION AND HIGH TION AND HIGH VVVVVOL OL OL OL OLTTTTTAAAAAGE LIMITS GE LIMITS GE LIMITS GE LIMITS GE LIMITS Be aware of the instructions and procedures covering X-ray radiation. In solid-state receivers and monitors, the CRT is the only potential source of X-rays. Keep an accurate high voltage meter available at all times. Check meter calibration periodically. Whenever servicing a receiver, check the high voltage at various brightness levels to be sure it is regulating properly. Keep high voltage at rated value, NO HIGHER. Excessive high voltage may cause X-ray radiation or failure of associated components. DO NOT depend on protection circuits to keep voltage at rated value. When troubleshooting a receiver with excessive high voltage, avoid close contact with the CRT. DO NOT operate the receiver longer than necessary. To locate the cause of excessive high voltage, use a variable AC transformer to regulate voltage. In present receivers, many electrical and mechanical components have safety related characteristics which are not detectable by visual inspection. Such components are identified by a # on both the schematic and the parts list. For SAFETY, use only equivalent replacement parts when replacing these components. GENERAL GUIDELINES GENERAL GUIDELINES GENERAL GUIDELINES GENERAL GUIDELINES GENERAL GUIDELINES Perform a final SAFETY CHECK before returning receiver to customer. Check repaired area for poorly soldered connections, and check entire circuit board for solder splashes. Check board wiring for pinched wires or wires contacting any high wattage resistors. Check that all control knobs, shields, covers, grounds, and mounting hardware have been replaced. Be sure to replace all insulators and restore proper lead dress. SAFETY CHECKS — FIRE AND SHOCK HAZARD SAFETY CHECKS — FIRE AND SHOCK HAZARD SAFETY CHECKS — FIRE AND SHOCK HAZARD SAFETY CHECKS — FIRE AND SHOCK HAZARD SAFETY CHECKS — FIRE AND SHOCK HAZARD Cold Leaka Cold Leaka Cold Leaka Cold Leaka Cold Leakaggggge Chec e Chec e Chec e Chec e Checks f ks f ks f ks f ks for Receiver or Receiver or Receiver or Receiver or Receivers with Isolated Gr s with Isolated Gr s with Isolated Gr s with Isolated Gr s with Isolated Ground ound ound ound ound Unplug the AC cord, connect a jumper across the plug prongs, and turn the power switch on (if applicable). Use an ohmmeter to measure the resistance between the jumped AC plug and any exposed metal cabinet parts such as antenna screw heads, control shafts, or handle brackets. Exposed metal parts with a return path should measure between 1M ohms and 5.2M ohms. Parts without a return path must measure infinity. Hot Leaka Hot Leaka Hot Leaka Hot Leaka Hot Leakaggggge Current Chec e Current Chec e Current Chec e Current Chec e Current Checkkkkk Plug the AC cord directly into an AC outlet. DO NOT use an isolation transformer. Use a 1500 ohms, 10W resistor in parallel with a .15µF capacitor to connect between any exposed metal parts on the receiver and a good earth ground. (See figure below.) Use an AC voltmeter with at least 5000 ohms per volt sensitivity to measure the voltage across the resistor. Check all exposed metal parts and measure voltage at each point. Voltage measurements should not exceed .75VAC, 500µA. Any value exceeding this limit constitutes a potential shock hazard and must be corrected. If the AC plug is not polarized, reverse the AC plug and repeat exposed metal part voltage measurement at each point. The listing of any available replacement part herein in no case constitutes a recommendation, warranty, or guarantee by SAMS Technical Publishing as to the quality and suitability of such replacement part. The numbers of the listed parts have been compiled from information furnished to SAMS Technical Publishing by the manufacturers of the specific type of replacement part listed. Reproduction or use, without express permission, of editorial or pictorial content, in any manner, is prohibited. No patent liability is assumed with respect to the use of the information contained herein. © 2003 5436 West 78th Street Indianapolis, IN 46268-4149 Printed in the United States of America 5 4 3 2 1 03PF02087 PPPPPaaaaaggggge 1 e 1 e 1 e 1 e 1 SET 4715 SET 4715 SET 4715 SET 4715 SET 4715 UPC HERE 4715 • Sc Sc Sc Sc Schematics hematics hematics hematics hematics • Component locations Component locations Component locations Component locations Component locations • PPPPPar arar ararts list ts list ts list ts list ts list Essential co Essential co Essential co Essential co Essential covera vera vera vera veragggggeeeee fffffor ser or ser or ser or ser or servicing a tele vicing a tele vicing a tele vicing a tele vicing a television receiver vision receiver vision receiver vision receiver vision receiver............... Representative Model HIGH HIGH HIGH HIGH HIGH VVVVVOL OL OL OL OLTTTTTAAAAAGE SHUTDO GE SHUTDO GE SHUTDO GE SHUTDO GE SHUTDOWN WN WN WN WN TEST TEST TEST TEST TEST Momentarily short BC14901 (see Q14901 base) to ground. The receiver should lose raster and sound. If receiver does not lose raster and sound, the shutdown circuit should be repaired. To resume normal operation, remove AC power for approximately 30 seconds and then turn the receiver on.