Hughes JVC 100, Service Manual

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Chapter 2---System Description
2-30 Model 100 Service Manual
The SC/RTG I/O diagram (see Figure 2-13) and the list of Inputs and Outputs
(see Table 2-8) provide information for the technician to perform module-level
troubleshooting.
Figure 2-13
I/O Diagram of System Controller section of SC/RTG PCB.
IIC Interface
Communications are performed through the IIC bus to the other PCBs in the
system. This three-wire bus interface consists of clock line, data line and interrupt
line. The System Controller PCB controls the IIC bus and tells the other PCB
when to send and receive data over the IIC bus.
System Controller / Raster Timing Generator Input/Output
This section provides a description of the inputs to and outputs from the SC/RTG.
The I/O descriptions are arranged by the source/destination of the signal. The
format used is such that the assembly communicated with is used as the primary
heading of each output. Input refers to an input to the SC/RTG, output refers to an
output from the SC/RTG.