JVC 250 - Manual (Page 58)

Chapter 5---Electronics
Model 250 Service Manual 5-3
Figure 5-2 Model 250 Electronics Module with PCBs (side view).
CAUTION ! It is very strongly recommended that setup
data be downloaded (Exported, see section 8.2 Importing/Exporting) before
performing any of the following procedures. Exporting baseline source
setup data to disk is an excellent precautionary measure. It will save the
time of setting up new source file(s) in the case of an unexpected problem
.
5.3 System Controller PCB
System Controller PCB - Main Function
! Enables control for the Low Voltage Power Supply, Arc Lamp and
cooling fans.
! Fault monitors the HVPS, LVPS, Arc Lamp, and fans.
! Provides IIC serial bus communication and control between PCBs.
! Controls Zoom and Focus of the Projection Lens.
! Generates Menu and Internal Patterns Overlays
! X and Y Convergence control
! Threshold and Sensitivity for shading