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VP251 Schematic ( PDF Datasheet ) - Faroudja

Teilenummer VP251
Beschreibung Video Processor
Hersteller Faroudja
Logo Faroudja Logo 




Gesamt 17 Seiten
VP251 Datasheet, Funktion
www.DataSheet4U.com
“Perfecting Video with a
No-Compromise Approach
for Reproducing
the Ultimate Film Experience”
The Faroudja
VP251 Video Processor
With Picture PlusTechnology
Installation & Operation
Instructions






VP251 Datasheet, Funktion
www.DataSheet4U.com
SYSTEM DESCRIPTION
Circuit Description
Figure 1 is a block diagram of the VP251 showing
signal flow and the location of front panel controls
and switches. Composite Video and S-Video
inputs are connected to the decoder with AGC
control and converted to Y, R-Y and B-Y signals.
The Y, (Luminance) output from the decoder
enters the input switcher while the R-Y and B-Y
signal enter the Chroma Enhancement block
where the Tint phase can be adjusted when select-
ed in the manual mode. The RGB input signals are
transcoded to Y, R-Y, and B-Y signals and fed to
the input switcher. Component signals are fed
directly to the input switcher.
The input switcher then selects the correct function
and outputs the Y signal to the Luminance Line
Doubler block. The Luminance Line Doubler block
contains the Brightness, Contrast and Freeze con-
trols while the R-Y and B-Y signals enter the
Chroma block where the color level can be con-
trolled along with the Freeze controls. The Line
Doubler Luminance signal now enters the
Luminance Detail and Noise Reduction block
where the functions of Noise Reduction and
Detail Level are controlled.
The Luminance signal from the Luminance Detail
and Noise Reduction block along with the R-Y and
B-Y signals from the Chroma Line Doubler block
feed the output transcoder and are converted
to RGB signals. These RGB signals are buffered
and then sent to both the BNC and monitor
output connectors.
When using the RGB or Component inputs, Sync
is derived from the G or Y input signals unless
sync is provided to the Composite Sync input. The
Composite Sync input will override the sync from
the G or Y inputs. The sync signal then feeds the
VP251 clock generator and is used as a reference
to generate Horizontal Sync, Vertical Sync and
Composite Sync.
Inventory List
1 VP251 Digital Video Processor
1 Installation/Operation Manual
1 Warranty Card
1 Power Cord
Caution Notes
Do not connect the VP251 to a Monitor/
Projector not capable of the correct scan
rates. (31.5KHz)
High Voltages are present inside. Opening
the unit will void all warranties.
No user serviceable parts inside.
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6 Page









VP251 pdf, datenblatt
www.DataSheet4U.com
TROUBLESHOOTING
Many of the new generation of projectors and computer monitors require TTL sync levels to operate correct-
ly. The D15 output on the Faroudja processors output TTL sync. The best approach in these circumstances
is to use a standard D15 to RGB breakout cable and connect it to the D15 connection on the Faroudja
processor. Use the H & V sync from the breakout cable and the R, G, B from the BNC connectors on the
rear panel for the best image.
Problem
No power light
Solution
Unit not turned on
Unit not plugged in
Fuse blown
No power at plug
No picture
Video source not selected
No video source connected or operating
Projector/Monitor not turned on
Projector/Monitor not connected correctly
Bad video cable
Unit in freeze mode
Check brightness and contrast levels
Colors bleeding
Check termination
Check projector/monitor termination
Contrast set too high
Color set too high
Picture not stable
Check interface cables
Sync cables are swapped or not connected
Input source not selected correctly
Check input terminations
Projector Fast/Slow Horizontal time constant. Should be set to fast.
Incorrect colors
Tint in manual mode
Defective output cable
RGB cables are swapped
Check projector/monitor termination
Input source not selected correctly
No burst on input
RGB or Y,R-Y, B-Y Inputs not terminated.
Picture washed out
Composite input not terminated
NOTE: To make sure that an input source is not the cause of a problem for a composite source, turn the
termination switch off and connect a composite monitor to the composite input Loop input.
To make sure that a projector is not the cause of a problem, connect a 31.5KHz multisync monitor to the
15pin output connector and check the display to see if it is correct or if the monitor display shows the same
problem as the projector display, then the VP251 has a problem and you should contact our Technical
Support Department.
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