ViewSonic Pro8400 Series VS13647 Service Manual page 37

Zoom ring and Focus ring
Ring
Zoom ring
Focus ring
(4) Image Quality
Projected image size: 60 inches (diagonal length)
Zoom ring: Adjust zoom ring to wide (Maximum projection size)
VGA
I/O port
Test Equipment
Signal format
Projected image size
ViewSonic Corporation
Mechanical motion of rotating Zoom ring to the end of right and left by
hand should be free from getting stuck.
The feeling of rotating Focus ring to the end of right and left by hand
should free from seizing
Monitor In (VGA)
Standard Pattern generator (Ex. Quantum data)
1920*1080 60Hz
60" in diagonal length
Test Pattern
Test criteria
ANSI Brightness
Apparent color strip, bend and streak
corner on the projected image are not
allowable.
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Test criteria
Pro8400