NEC PG Series

      >> Introduction
      >> Layout and Setup Tips 
      >> Mechanical Setup Procedure
      >> PG Models and Production Run Dates
      >> PC Control Cable Pinout & Software
      >> Manuals / Downloads

System boards

I am lumping the system, wave and control boards together as they all work together and have no user adjustments on them. These boards all fit in the shielded card cage. The PG model had two system type boards, the PG + and Xtras had all three. The boards between the models changed, so you can’t mix and match these boards. Even the 6 and 9 PG models use different boards, and some problems will result if you don’t use the right board or software revisions.

Again, there are no user adjustments on these boards. The most common failure of these boards is caused by a bad system board which usually causes loss of sync at certain resolutions. Usually either a video or S-video signal will work (480i) and/or 480p with an RGB input will work, but all other resolutions will not lock properly. On occasion I can repair these boards if this occurs, often the system board will need replacement. Fortunately, these boards do not fail often.

Not pictured is a similar looking point convergence board which also fits into the shielded card cage. This board provides 100 points of convergence per color that is used to fine tune the image. The point board came stock with the 9PG series of sets, it was optional with the 6 PG series.