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OTC COMMUNICATION (Figure 68)
The Keyboard is connected to the OTC via the Sensor board and System board to Pin 107.
The Standby line on Pin 104 goes Low when the set is turned On. It also turns On the
Standby LED. The On/Off line, Pin 113, goes Low turning On 7010 which outputs a High to
the Orange LED when the set is turned On. Once all of the circuits are turned On, this line
turns that LED Off. The Standby line then goes Low, which turns the Green LED On. A Light
Sensor connected to Pin 116 senses the ambient light to allow the set to change the bright-
ness for optimum viewing. The NVM, 7011, stores the customer settings, operation hours,
and option codes. The program to run the OTC is stored in IC 7006. IC 7012 is used by the
OTC as a temporary storage. There are two I
2
C busses, the Slow and Fast bus.
Page 80
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