Acer P7280 Refresh Service Manual page 105

4-9 Others
1. Functional Inspection
Keypad button
General
Factory Default
Display Size
Display Data Channel (DDC)
Acoustic
- All keypad buttons must operate
smoothly.
- All OSD functions must be checked
for functionality. When OSD menu
is displayed, there shall be no vis-
ible peaking, ringing, streaking, or
smearing artifacts on the screen.
- The factory settings (with appropri-
ate centering, size, geometry distor-
tion, etc.) shall be displayed upon
"Recall" is selected from OSD
- All preset modes shall expand to full
screen size using OSD Horizontal
and Vertical Size controls
- The purpose of the DDC test is to
verify the DDC1/DDC2B operation
of the projector and to verify Plug &
Play function.
- High pitch sound from cooling fan
and color wheel is unacceptable.
P7280/P7270I/P7280 Refresh/P7270I Refresh Confidential
4-11