1. Check the horizontal scanning and tracking frequency range. According to the horizontal scanning frequency range given in the technical indicators, select the three frequencies of high, medium, and low from them, and calculate the image resolution corresponding to the three frequency points. Check whether the projector can display normally under these three resolutions. If the line is out of sync, that is, the screen is twisted or jittered, it indicates that the horizontal scan tracking is poor.
2. To check the focusing performance, use the test grid generated inside the projector, or the test grid generated by the signal generator or computer, adjust the focus to the best position, change the image contrast from low to high, and observe the level and level of the grid. Whether the vertical lines are defocused. If so, it indicates poor focusing performance.
3. Check the video bandwidth. Video bandwidth directly affects the details of the video. Use a computer or signal generator to generate a white background graphic signal with the highest resolution that the projector can achieve, and observe whether the smallest character graphic on the screen is clear. For example, when the video bandwidth of the projector is insufficient, the horizontal lines displayed on the screen are relatively solid, while the vertical lines appear imaginary, and the image details are blurred.
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