Optoma 723 Family, Service Manual

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EP721/727/723/728 Family / EW1610 Family Confidential
4-11
4-9 Others
1. Functional Inspection
Keypad button - All keypad buttons must operate smoothly.
General - All OSD functions must be checked for functional -
ity. When OSD menu is displayed, there shall be
no visible peaking, ringing, streaking, or smearing
artifacts on the screen.
Factory Default - The factory settings (with appropriate centering,
size, geometry distortion, etc.) shall be displayed
upon “Recall” is selected from OSD.
Display Size - All preset modes shall expand to full screen size
using OSD Horizontal and Vertical Size controls.
Display Data Channel (DDC) - The purpose of the DDC test is to verify the DDC1/
DDC2B operation of the projector and to verify
Plug & Play function.
Acoustic - High pitch sound from cooling fan and color
wheel is unacceptable.