Grass Valley SMS-6000 Series - Manual (Page 59)

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Section 2 — Installation
Configuring the Frame
The system comes factory-configured but can be changed to suit your own
particular requirements. This sub–section describes how to do this for the
video and audio frames. The next sub –section covers the same processes
for the remote control panels.
NOTE: The rotary hex and DIP switches are read only at power up or following a
RESET. If you make any changes you must press the RESET button so that the
new settings are acted upon.
Analog Video Matrix Module
Input Coupling Mode
Normally there are DC restorers on each video input. They restore the sync
tips (the lowest part of the signal) to a voltage of –300mV so that
irrespective of the DC or average picture level of the incoming signal the
DC of the black level on the output will be constant.
This is fine for composite video signals, but for component video signals,
Pr (V) and Pb (U) have the potential for signal content both above and
below black level. A DC restorer is not suitable for such signals and the
signal is DC coupled through the matrix. Each of the restorers can be
jumpered in or out of circuit. The jumpers are located near the edge
connector by the input capacitors and hybrids. For each input there are two
links.
With the module placed with the extractors levers nearest you and the edge
connectors furthest away:
Set the jumpers vertical for composite signals and horizontal for
component signals. A diagram on the module is located near to the
jumpers to clarify.
Sometimes it is important to change the TV line in the vertical blanking
interval during which the routing switcher makes its crosspoint switches.
The analog video module provide this feature. Any line from 7/320 to 11/
324 may be selected using the three jumper links LK6, 7, 8. The diagram on
the circuit board shows the positions of the jumper links.
It is also possible to choose whether to permit switching on every TV field
or just on the first field of each picture. This can be important in certain
editing applications.
The factory settings for NTSC are line 10/273 and every field. For Pal they
are line 7/320 and every field.
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VERTICAL HORIZONTAL