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Q-750d Series Installation/Operation Manual 71
PRE
L
IMINAR
Y
5.1
Troubleshooting Tips
Table 5-1 provides some general guidelines for troubleshooting problems you may
encounter with the Q-750d. If you encounter an issue not described here, please contact
Runco Technical Support.
5. Maintenance and Troubleshooting
Table 5-1. Troubleshooting Chart
Symptom Possible Cause(s) Solution
Neither the DHD Controller
nor the projector turns on.
Both front-panel LEDs on the
DHD Controller are off (see
Figure 2-3).
• The DHD Controller is not
plugged in or the AC outlet
is not active.
• The main power switch at
the rear of the DHD
Controller (see Figure 2-4)
is set to the “off” position.
• Ensure that the DHD
Controller is plugged in
and that the AC outlet is
active.
• Set the switch to the “on”
position.
Neither the DHD Controller
nor the projector turns on. On
the DHD Controller, the
Runco icon LED is off and the
standby LED is on.
• The batteries in the remote
control are dead or
installed incorrectly.
• Press the ON/STANDBY
(
) button on the DHD
Controller front panel. If
the controller turns on,
verify that the batteries in
the remote control are
good and properly
installed (refer to Remote
Control on page 13).
The DHD Controller turns on,
but the projector does not.
• The DHD Controller is
connected to the Q-750d
incorrectly or not at all.
• The Q-750d is not plugged
in or the AC outlet is not
active.
• Verify the RS-232 cable
connection from the DHD
Controller to the Q-750d
(see Figure 3-10).
• Ensure that the Q-750d is
plugged in and that the AC
outlet is active.
The projector and DHD Con-
troller are both on and menus
appear, but there is no video
image on-screen.
• Incorrect source selection.
• Source component is not
turned on.
• Select the correct source.
• Turn on the source
component.
Image is too bright and/or
lacks definition in the bright
areas of the image.
• Contrast is set too high. • Lower the contrast setting.
Image appears “washed out”
and/or dark areas appear too
bright.
• Brightness is set too high. • Lower the brightness
setting.