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| +SERDATA | Serial data transfer. Unidirectional, differential, synchronous serial data |
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| communication line. Used for transferring data from SCB to other |
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| circuit boards. Uses SERCLK and IIC for control of receiver. |
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| Serial data transfer. |
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| System Controller Board |
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| Output | Description |
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| /IICINT | IIC interrupt line. Signal line for slave boards to inform the SCB (master) |
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| that there is data to be transferred. Master then polls slaves to |
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| determine the source of the interrupt. |
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| I/o | Description |
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| IICDATA | IIC data line. |
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| between SCB and other circuit boards. See detailed description for list |
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| of signals transferred and data direction. |
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| Raster Timing Generator |
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| Inputs | Description |
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| /PCST | Clock signal to start T/B pincushion, T/B Keystone, and horizontal |
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| linearity correction. |
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| Video Processor Board |
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| Outputs | Description |
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| HPARAB | Parabolic signal at horizontal frequency for dynamic focus. |
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| VPARAB | Parabolic signal at vertical frequency for dynamic focus. |
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| /SWEEPOK | Low indicates that all six sweeps are occurring at normal frequencies. |
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| Horizontal Deflection Board |
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| Inputs | Description |
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| HSENSRED | +15V indicates red horizontal flyback occurring at normal frequencies. |
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| HSENSBLU | Similar to HSENSRED. |
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| HSENSGRN | Similar to HSENSRED. |
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| HFDBCK | Voltage representing amount of horizontal scan drive. Used for modifying |
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| amount of side pincushion and keystone when changing horizontal |
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| frequency. |
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| WIDTH | Positive DC voltage representing commanded width of the raster. Used for |
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| generation of horizontal linearity ramp and T/B pincushion correction |
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| waveform. |
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| VERTDR | Pulse signal at vertical frequency from the vertical oscillator on the HDB. |
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| HLINR | Voltage representing commanded horizontal linearity correction. |
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| TBKEYCOR | Voltage representing commanded top and bottom keystone correction. |
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Model 330, 340SC and 370SC Service Manual |