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