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Chapter 2---System Description
Horizontal/Vertical Deflection Board I/O
This section provides a description of the inputs to and outputs
from the HVD Board. The I/O descriptions are arranged by the
source/destination of the signal. The assembly communicated with
is used as the primary heading of each group of signals. Those
signals are subdivided into inputs and outputs. Input refers to an
Input to the HVD Board, output refers to an output from the HVD
Board.
Table 2-11. Horizontal/Vertical Deflection I/O signals
S
y
stem Controller Board
INPUTS DESCRIPTION
IIC_CLK IIC clock line. Unidirectional clock line for control of synchronous
data transfer over the IIC bus interface.
IIC_DATA IIC data line. Bidirectional serial line for synchronous data transfer
between the System Controller Board and the HVD Board.
OUTPUTS DESCRIPTION
/IIC_SINT IIC interrupt line. This is not used by HVD Board.
Video Processor Board
OUTPUTS DESCRIPTION
/SWEEPOK Low = good scan. High = no scan. Signal is dependent on two
inputs; DEFL_OK (from SRB) and /H_ENABLE (from RTG).
Scan Reversal Board
INPUTS DESCRIPTION
FRONT/REAR
Front or rear projection status line. Front = low. Rear = high.
FLOOR/CEIL
Floor or ceiling projection status line. Floor = low. Ceiling = high.
DEFL_OK Deflection OK signal. High = good (about 2 v). Low = no scan.
H_CUR_
FDBK
Horizontal current feed back. A DC voltage proportional to the output
current.
H_LOCK- Horizontal interlock for yoke connectors. It should be 5 V when
closed or 0V when open.
V_RED- Current feedback of red vertical amplifier
V_GRN- Current feedback of green vertical amplifier
V_BLU- Current feedback of blue vertical amplifier
OUTPUTS DESCRIPTION
H_OUT_
FLYBACK
Horizontal output flyback pulse, about 800 VPP
2-48 Model 200 Service Manual