( 6 ) field amplitude adjustment knob : to check the oscillating electrical field , the field and the field excitation output circuit . The knobs are usually received oscillating electrical field to change the amplitude of the sawtooth generated . When rotating the knob , its linear sawtooth how many will go bad. ( 7 ) field linear adjustment knob : by hand to check the field excitation and field output circuits. The adjustment knob can be corrected through the field deflection coil sawtooth current waveform.

( 8 ) line sync adjustment knob : afc circuit for checking the line , the line and the line oscillating electrical output circuit .

( 9 ) to adjust the volume knob: to check the entire circuit to reproduce the audio signal.

( 10 ) Other Knob : For television , it still gather adjustment , power switch, knob. In addition, when the image does not appear , you can check whether the sound, if the fault is located audio amplifier circuit image or video amplifier circuit ; If no sound then the fault is located in tuner . For color television receivers , they can still use the channel selector switch inspection " does not appear accurate coloring " fault . Due to the different circuits corresponding to each failure symptoms , it is necessary to understand the principles and the role of the work of the circuit to determine the fault circuit .

2 , track the location of the fault

Even determining the scope of the failure of the circuit, this is not enough . Must also be further subdivided into around a circuit transistors or integrated circuits , and then use a multimeter , tools and lead wire , etc., check each test point to distinguish and confirm the individual components. For fast and accurate troubleshooting , repairs must remember its program, and noted that the distinction between circuit test points and methods of measurement . Right , that " does not appear raster " fault repair program chart .

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