Runco Q-750d Ultra Series Installation & Operation Manual page 102

Maintenance and Troubleshooting
Table 5-1. Troubleshooting Chart (continued)
Symptom
RGB-HD or Component HD
images appear "noisy" or drop
out intermittently.
Computer images do not dis-
play correctly.
Images from an HDMI source
do not display.
Video from an HDMI source
lags behind audio.
The image is too large or too
small.
AutoScope lens motor doesn't
work.
Possible Cause(s)
• Tracking and Phase
settings need adjustment.
• The DHD Controller is
having difficulty detecting
sync pulses from the
source.
• The resolution and
frequency of the video card
in the computer are not
compatible with the
Q-750d Ultra.
• The resolution and
frequency of the video card
in the computer are not
compatible with the
Q-750d Ultra.
• EDID compatibility issue.
• HDMI cable from source to
DHD Controller is either
defective or too long.
• Refer to Audio/Video
Synchronization Issues
on page 20.
• Image size needs adjusting.
• The motor is not plugged in
or the AC outlet is not
active.
• The motor is not connected
to the trigger output on the
DHD Controller.
• Incorrect trigger
assignment.
86 Q-750d Ultra Series Installation/Operation Manual
Solution
• Adjust Tracking and Phase
settings (refer to Input
Position on page 62).
• Adjust the Sync Threshold
setting (refer to Sync
Threshold on page 81).
• Select a compatible
resolution and vertical
frequency (refer to
Supported Timings on
page 115).
• Select a compatible
resolution and vertical
frequency (refer to
Supported Timings on
page 115).
• Set HDMI EDID Extension
to "Off" (refer to HDMI
EDID Extension on
page 81).
• Try a known-good and/or
shorter HDMI cable.
• Use an external A/V
receiver with audio delay
capability to synchronize
the audio signal with the
video signal.
• Adjust the image size (refer
to Input Position on
page 62).
• Ensure that the motor is
plugged in and that the AC
outlet is active.
• Check the trigger
connection between the
lens motor and DHD
Controller (Figure 3-19).
• Correct the trigger
assignment (refer to
Configure Lens Motor
Trigger (Q-750d
Ultra/CineWide with
AutoScope only) on
page 49).