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Table 5-1. Troubleshooting Chart (continued)
Symptom
The display is jittery or
unstable.
Image is too bright and/or
lacks definition in the bright
areas of the image.
Image appears "washed out"
and/or dark areas appear too
bright.
Colors in the image are
swapped; for example, reds
appear blue or vice versa.
The display freezes suddenly.
The projector will not turn
back on after it was powered
down, or the image disap-
pears during operation.
AutoScope lens motor does
not work.
Runco SC-1 Owner's Operating Manual
Possible Cause(s)
• Poor-quality or improperly
connected source.
• The horizontal or vertical
scan frequency of the
input signal may be out of
range for the projector.
• Contrast is set too high.
• Brightness is set too high.
• The Red/Pr, Green/Y or
Blue/Pb outputs from the
source are connected to
the wrong inputs on the
DHD Controller.
• Excessive voltage noise on
the AC or ground input has
interrupted the projector's
ability to lock on to a
signal.
• The projector will not turn
on for several minutes after
power-down, to protect
the lamp.
• The lamp has failed.
• The motor is not plugged
in and turned on, or the AC
outlet is not active.
• The motor is not
connected to a trigger
output on the DHD
Controller.
• Incorrect trigger
assignment.
Solution
• Ensure that the source is
properly connected and of
adequate quality for
detection.
• Correct at the source.
• Lower the contrast setting.
• Lower the brightness
setting.
• Ensure that the source
outputs are connected to
the correct DHD Controller
input.
• Power down the projector
and disconnect from AC.
Then, plug in again and
power up as usual.
• Wait until the LED at the
front of the DHD Controller
turns red.
• Replace the lamp.
• Ensure that the motor is
plugged in and turned on,
and that the AC outlet is
active.
• Check the trigger
connection between the
lens motor and DHD
Controller (Figure 3-18).
• Correct the trigger
assignment (refer to
Configure Lens Motor
Trigger on page 51).
97
Maintenance and Troubleshooting
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Table of Contents
Troubleshooting
