Specifications

83
Troubleshooting
SECTION 5
If the projector does not appear to be operating properly, note the symptoms present
and use the following guide to assist you. If you cannot resolve the problems yourself,
contact your dealer for assistance.
NOTE: A qualified Runco service technician is required when opening the projector
to diagnose any “probable cause”.
5.1 Displays
SYMPTOM CAUSE/REMEDY
The projector is on but
there’s no display...
Was a lens cover accidentally left on? Remove lens
cover.
Make sure the shutter is OPEN.
Is the lamp ignited? Check for interlock problems such
as an open lamp door OR check for light spillage out the
back.
Is the correct input selected? Check cable connections.
Check if menus appear on screen.
Can you access test patterns? Make sure there is not a
full black test pattern selected for display—press Menu
to access test patterns, then cycle patterns with keys.
Check your source connections again.
Severe motion
artifacts...
Most likely there is a synchronization problem with
reversed 3/2 pull-down in 60Hz-to-24Hz film-to-digital
conversion in your source. Correct at the source.
Was an excessive amount of keystone used?
Image appears
“squeezed” or vertically
stretched into center of
screen
Check your Resizing selection.
Check the DHD Controller’s aspect ratio selection.
The display is jittery or
unstable...
If the display is jittery or blinking erratically, ensure that
the source is properly connected and of adequate
quality for detection. With a poor quality or improperly
connected source, the projector will repeatedly attempt
to display an image, however briefly.
The horizontal or vertical scan frequency of the input
signal may be out of range for the projector. Refer to
Section 6, Specifications for scan frequency ranges.
The sync signal may be inadequate. Correct the source
problem.
The display is faint...
Brightness and/or contrast and/or gamma may be set
incorrectly.
The source may be double terminated. Ensure the
source is terminated only once.
The source (if non-video) may need a different sync tip
clamp location.
The upper portion of
the display is waving,
tearing or jittering...
This can sometimes occur with video or VCR sources.
Check your source.