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The Q-750d Ultra Series LED Home Theater Projector and DHD Controller does not
require any routine maintenance. There are no user-serviceable or -replaceable parts.
Unless you are a qualified, factory-trained Runco technician, do not attempt to repair or
replace any system component yourself. You will void the product warranty if you do
so.
Table 5-1 provides some general guidelines for troubleshooting problems you may
encounter with the Q-750d Ultra Series LED Home Theater Projector and DHD Controller.
If the suggested solutions fail to resolve the problem or if you encounter an issue not
described here, please contact your Runco dealer or Runco Technical Support.
Table 5-1. Troubleshooting Chart
Symptom
The projector does not turn
on.
The display and DHD Control-
ler both turn on, but there is no
picture and on-screen menus
do not appear.
The display is on and menus
appear, but there is no picture.
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.
Q-750d Ultra Series Installation/Operation Manual
5. Maintenance and Troubleshooting
Possible Cause(s)
• The projector is not
plugged in or the AC outlet
is not active.
• The DHD Controller is not
plugged in or the AC outlet
is not active.
• The remote control
batteries have run out.
• Faulty or incorrect video
connection from the DHD
Controller to the display.
• Incorrect source selection.
• Source component is not
turned on.
• Source component is
connected incorrectly or
not at all.
• 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.
Solution
• Ensure that the projector is
plugged in and that the AC
outlet is active.
• Ensure that the DHD
Controller is plugged in and
that the AC outlet is active.
• Replace the batteries.
• Ensure that the HDMI
output from the DHD
Controller is properly
connected to the display
(see Figure 3-10).
• Try a known-good and/or
shorter HDMI cable.
• Select the correct source.
• Turn on the source
component.
• Check connections from
the source component to
the DHD Controller.
• Lower the contrast setting.
• Lower the brightness
setting.
• Ensure that the source
outputs are connected to
the correct DHD Controller
input.
85
Maintenance
Troubleshooting
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