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NEC PG Series
Layout and Setup Tips
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(Page 3)
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Focus board
Much to the chagrin of some people, there will be a number of boards that
have no user adjustments on them. The focus and convergence board are good
examples of this. The below image is of the focus board. This board is generally
reliable, but if you lose control of the focus adjustments of one or more tubes,
this board is most likely the bad one.
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