According to the fault analysis of phenomena, first check the pillow school circuit. The aircraft pillow school circuit uses to produce Toshiba TA8859P deflection distortion correction circuit as the core controller and CPU {30}, {31} feet SDA2, SCL2 controlled by the realization of the image field amplitude, field centers, field linear, line width, line center and the S correction, distortion correction, while producing field frequency sawtooth signal to drive the field output circuit and compensation CRT swath of changes due to changes in beam current generated. The machine is set in the volume "CHK4" maintenance adjustments, press the remote control + and - keys to adjust the image swath around pincushion distortion and did not have any change. Off-line measurement of the field frequency wave parabolic late stage amplifier circuit R765, Q701 and other components were normal, the pin voltage detection IC701 found two pin voltage is 0 ª± 3V (normal is about 0 ª± 6V), down 2 feet line detection related components shown on the left, found C707 (0 ª± 047μF/50V) has leakage damage. And then converted to the new capacitor will feature set CHK4 maintenance adjustment of status, carefully adjust the line about parabolic wave amplitude parameter, the line width back to normal, to eliminate image distortion.3DEservice manual download site