Optoma HD20 Service Manual page 37

Inspection item
Criteria
2. Bright pixel
Procedure
Inspection item
Criteria
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. Posi-
tion/V. Position to the inner screen.
- 
E liminate visual wavy noise by Rsync, Frequen-
cy 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.
- 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" func-
tion to adjust the screen.
- The PC mode functionally sure be workable
include support format with frequency and auto
detected functional will be workable.
- Test equipment: video generator.
- Test signal: analog 1920 x 1080@60Hz analog 1920 x 1080@60Hz
- Test Pattern: Gray 10 Gray 10
- Bright pixel check.
- Bright pixel is unacceptable in the active zone; 1
pixel is allowed on the frame.
- Adjacent pixels are unacceptable.
- Ref. Defect specification table
HD20/HD200X/HD2200/HD20LV
General-1
Master
Gray 10
Confidential
4-5