Planar PD7170 - Manual (Page 68)

Operation
54 Planar PD7170 Installation/Operation Manual
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For best results, use a good test pattern such as a smooth gray consisting of a
clear pattern of black and white pixels, or a similar “half on, half off” graphic
image. Adjust the slidebar until the image stabilizes and each pixel is clearly
defined. You may notice that you can stabilize the image at more than one
point. Use either setting in such cases.
• Tracking (RGB or Component sources): Tracking determines the frequency of
the pixel sampling clock, indicated by the number of incoming pixels per line,
so that all pixels generated by a particular source are sampled.
Steady flickering or several soft vertical stripes or bands across the entire
image indicates poor pixel tracking. Proper pixel tracking helps ensure that
the image quality is consistent across the screen, that aspect ratio is
maintained and that pixel phase (see above) can be optimized.
• Sync Level (Component sources only): Select Sync Level to adjust the
voltage level of the PD7170 Sync signal detection circuitry.
Sync Level adjustment is occasionally necessary when a DVD player or HDTV
source signal drops “below black” (for example, during scenes with
explosions or when subtitles are present) and causes the projector to
temporarily lose sync. If the Sync Level from the source is persistently too low,
the projector won’t sync with the source at all.
The range is from 50 to 256 millivolts (mV) inclusive. The default setting is
240 mV and should rarely require adjustment.
Adjust the Phase after adjusting Tracking (see below). If
some shimmer from a video or HDTV source persists, use the
Noise Reduction controls (described on page 46) to
remove high-frequency noise from the signal.
Tip