Runco Q-750D User Manual

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Q-750d Series Installation/Operation Manual
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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.