Optoma H31 Service Manual page 32

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Ycb cr (480i)
Press "Source" to switch to component-I mode and check the iamge quality.
-Brit-mode:
Press "Menu" botton to enter Brit-mode and selecting "On" will have dark and "Off" will have bright
iamge.
Check for Secondary Display Modes
Test signal :
1.) 640*480 @ 72.81/75.00/85.01Hz
2.) 720*400 @ 70.08/85.04Hz
3.) 800*600 @ 56.25/60.32/72.19/75.00/85.06Hz
4.) 832*624 @ 74.55Hz
5.) 1024*768 @ 43.48/60.00/70.00/75.03/85.00Hz
Normally when the primary mode 800*600 @ 85Hz is well adjusted and complaint with the specification,
then the secondary display modes will be great possibility to be complaint with the specification. But we
still have to check with general test pattern to make sure every secondary modes is complaint with
specification.
Factory Reset :
After final QC step, we have to erase all saved change again and restore the factory defaults. Please select
and enter "Factory Reset" Function to see if it is workable. This action will allow you erase all end-user's
settings and restore the original factory setting.
Coretronic Corporation
4-7 H31