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Chapter 2---System Description
2.3.10 Scan Reversal Board
The Scan Reversal Board (SRB) is mounted vertically on the right
side of the card cage.
The following functions are provided by the SRB:
• Reversal of scan in both horizontal and vertical axes
• Horizontal width adjustment for each color (R, G &B)
• Horizontal current feedback
• Scan failure detection for all six main (horizontal and vertical)
deflection amplifiers
The Scan Reversal Board Input/Output diagram (Figure 2-16) and
the list of inputs and outputs (Table 2-15) provide information for
the technician to perform module level troubleshooting. Table 2-14
shows the signal states for modes of projector operation.
The SRB does not require any IIC bus interface.
Table 2-14. Scanning signal states
Mode of Operation
FRONT/REAR
line
FLOOR/CEIL
line
Front and floor projection Low Low
Front and ceiling projection Low High
Rear and floor projection High Low
Rear and ceiling High High
Model 200 Service Manual 2-57