Acer P5271 Acer P5271, P5271i, P5290 and P5390W Projector Series Service Guide - Page 68

4-7 PC MODE Note: - When getting into function test, adjust "lens shift" to guarantee the lens at the highest state and the image maximum, and adjust the focus to guarantee the image at the clearest, then start test. 1. Frequency and Tracking Boundary Procedure - Test equipment: video generator - Test signal: analog 1024 x 768@60Hz (for P5271/P5290/P5271i); 1280 x800@75H (for P5390W) - Test Pattern: General-1 or Master - Check and see if the image sharpness is well performed. - If not, re-adjust by the following steps: (1) Select "Frequency" function to adjust the total pixel number of pixel clock in one line period. (2) Select "Tracking" function and use right or left arrow key to adjust the value to minimize video flicker. - Adjust Resync or Frequency/Tracking/H. Position/V. Position to the inner screen. Inspection item - Eliminate visual wavy noise by Resync, Frequency or Tracking selection. - Check if there is noise on the screen. - Horizontal and vertical position of the video should be adjustable to the screen frame. Criteria - If there is noise on the screen, the product is considered as failure product. - If there is noise on the screen, use auto or manual "frequency" function or "tracking" function to adjust the screen. - The PC mode functionally sure be workable include support format with frequency and auto detected functional will be workable. General-1 Master 2. Bright Pixel Procedure - Test equipment: video generator P5271/P5290/P5390W/P5271i Confidential 4-