Runco Q-750I User Manual

Table 5-1 provides some general guidelines for troubleshooting problems you may 
encounter with the Q-750i. If the suggested solutions fail to resolve the problem or if you 
encounter an issue not described here, please contact Runco Technical Support. 

The projector does not turn 
on. 

• The Q-750i is not plugged 

in or the AC outlet is not 
active. 

• Ensure that the Q-750i is 

plugged in and that the AC 
outlet is active. 

The remote control does not 
work correctly. 

• The batteries have run out. 

• Replace the batteries. 

The projector is on and OSD 
menus appear, but there is no 
video image on-screen. 

• Incorrect source selection.
• Source component is not 

turned on. 

• Source component is 

connected incorrectly or 
not at all. 

• Select the correct source. 
• Turn on the source. 

 

• Check cable connection 

from source component to 
projector. 

A projected image from a 
DVD is split or otherwise 
scrambled. 

• DVD player is connected 

to the Component input 
and set to progressive 
scan mode. 

• Turn off progressive scan 

on the DVD player. 

Image is blurred. 

• The lens is not correctly 

focused. 

• Adjust the focus. 

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 geometry is incorrect.

• Incorrect aspect ratio 

selection. 

• Select the aspect ratio that 

best matches the source 
image and screen size 
(refer to Table 4-2). 

Image appears “washed out” 
and/or dark areas appear too 
bright. 

• Brightness is set too high.

• Lower the brightness 

setting. 

Colors in the image are 
swapped; for example, reds 
appear blue or vice versa. 

• The  Red/Pr,  Green/Y  or 

Blue/Pb outputs from the 
source are connected to 
the wrong inputs on the 
Q-750i.

• Ensure that the source 

outputs are connected to 
the correct Q-750i input. 

Note: You can obtain more detailed information about the cause of the error condition using 
RS-232 commands. Refer to RS-232 Error Codes on page 83 for more information.