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Chapter 2---System Description
2.3.8 Horizontal/Vertical Deflection PCB
The HVD board is located on the top side of the deflection cage in
front of the electronic card cage.
The Horizontal/Vertical Deflection Board I/O diagram (Figure 2-14)
and the list of inputs and outputs (Tables 2-10 and 2-11) provide
information for the technician to perform module level
troubleshooting.
The following functions are provided by the HVD board:
• Horizontal raster centering for all three colors
• Horizontal gate drive
• Switch mode power supply generating the required
proportional DC supply
• Horizontal width adjustment
• Horizontal retrace switch network
• Left/right pincushion and keystone correction
• Drive main deflection coils to provide horizontal raster scan for
all three CRTs
• Drive main vertical coils to provide vertical raster scan for all
three CRTs
• Vertical linearity adjustments individually for all three colors.
• Vertical raster centering for all three colors
• IIC interface
IIC Interface
All adjustments for the HVD board are performed by the System
Controller via the IIC serial bus interface. This three wire bus
interface consists of a clock line, a data line, and an interrupt line.
The HVD board does not create any interrupt and the interrupt line
is not used for this application. Table 2-10 lists the adjustments
executed via the IIC bus interface (I = Input to HVD board , O =
Output from HVD board):
Model 200 Service Manual 2-45