Hughes JVC 100, Service Manual

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Chapter 2---System Description
2-42 Model 100 Service Manual
The Horizontal Deflection Input/Output diagram (see Figure 2-17) and the list of
inputs and outputs (see Table 2-11) provide information for the technician to
perform module level troubleshooting.
Figure 2-17
I/O diagram of Horizontal Deflection PCB.
IIC interface
Adjustments for this board are performed by the System Controller via the IIC
serial bus interface. This three-wire bus interface consists of a clock line, a data
line and an interrupt line. The C/D Board does not create any IIC interrupt.
The Horizontal Deflection Board I/O
This section describes the inputs to and outputs from the C/D Board. The I/O
descriptions are arranged by the source and destination of the signal. The
assembly communicated with is the primary heading of each group of signals.
Those signals are subdivided into inputs and outputs. Input refers to an Input to
the C/D Board, output refers to an output from the C/D Board.
Table 2-11
Horizontal Deflection input/output signals
Horizontal Deflection PCB
Inputs
+5.1V Power for digital circuitry.
+15V Power for analog circuitry.
+15V Power for analog circuitry.