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Alignment and Adjustments 4. Alignment and Adjustments 4-1 General Alignment Instructions 1. Usually, a color TV-VCR needs only slight 5. Avoid overload. Excessive signal from a touch-up adjustment upon installation. Check sweep generator might overload the front-end the basic characteristics such as height, of the TV. When inserting signal markers, do horizontal and vertical sync and focus. not allow the marker generator to distort test results. 2. Observe the picture for good black and white details. There should be objectionable color 6. Connect the TV only to an AC power source shading; if color shading is present, with voltage and frequency as specified on the demagnetize, perform purity and convergence backcover nameplate. adjustments described below. 7. Do not attempt to connect or disconnect any 3. Use the specified test equipment or its wires while the TV is turned on. Make sure equivalent. that the power cord is disconnected before replacing any parts. 4. Correct impedance matching is essential. 8. To protect against shock hazard, use an isolation transformer. 4-2 Automatic Degaussing A degaussing coil is mounted around the If the chassis or parts of the cabinet become picture tube, so that external degaussing after magnetized, poor color purity will result. If moving the TV should be unnecessary. But this happens, use an external degaussing coil. the receiver must be properly degaussed upon Slowly move the degaussing coil around the installation. faceplate of the picture tube and the sides and front of the receiver. Slowly withdraw the coil The degaussing coil operates for about 1 to a distance of about 6 feet before turning second after the power is switched ON. If the power OFF. set is moved or turned in a different direction, the power should be OFF for at least 10 If color shading persists, perform the minutes. following Color purity and Convergence adjustments. 4-3 High voltage Check CAUTION : There is no high voltage adjustment on this chassis. The B+ power supply should be +135 volts (with full color- bar input and normal picture level). 1. Connect a digital voltmeter to the second anode of the picture tube. 2. Turn on the TV