Optoma 723 Family, Service Manual

Page: 33 / 87

Confidential
4-4
EP721/727/723/728 Family / EW1610 Family
4-6 PC MODE
1. Frequency and tracking boundary
Procedure - Test equipment: video generator
- Test signal: analog 800 x 600@60Hz (EP721/723
Family)
1024 x 768@60Hz (EP727/728 Family)
1280 x 800@60Hz (EW1610 Family)
- Test Pattern: General-1 or Master
- Check and see if the image sharpness is well-per -
formed
- 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 Rsync, Frequency
or Tracking selction
- Check if there is noise on the screen
- Horizontal and vertical position of the vedio should
be adjustable to the screen frame
Criteria - If there is noise on the screen, the product is consid -
ered as faliure product
- If there is noise on the screen, use auto or manul
“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
2. Light Leak
Procedure - Test equipment: video generator
- Test signal: analog 800 x 600@60Hz (EP721/723
Family) Family))
General-1
Master