Grass Valley SMS-6000 Series - Manual (Page 108)

5-4
Section 5 — Maintenance
Alignment
The equipment is carefully aligned before shipment and, through the use
of modern high stability components, conservative design and low heat
dissipation, it should not be necessary to undertake any adjustments.
However should it be necessary to change a component it may then be
necessary to make an adjustment. However even then it is most unlikely
that the complete unit would need to realigned. We recommend that you
adjust only what you have to and use other channels as a guide to what to
expect. The procedure below describes how this should be done. Any
realignment should be done only by a technician trained in the use of the
test equipment below and of video alignment procedures.
There are three ways to access the adjustment controls:
1. Use the optional Extender Module so that the module is accessible.
While this is useful to set the gains it will not give satisfactory results
when setting the analog video frequency response or with serial digital
video routers. This is available as an option mainly for fault finding
rather than as an aid for alignment.
2. If there is access from above the frame you can remove the top cover to
expose the controls. This is an accurate method.
3. A third method which is time consuming but can be accurate is to
unplug the module, make a minor adjustment without being able to see
the results, to replace the module and measure the result, repeating the
process until satisfactory results are obtained. Fortunately you will
probably only have to adjust one channel and a high degree of accuracy
can be achieved with patience. As an aid, the adjustment controls are
arranged so that a clockwise rotation of the control increases the
parameter being set.