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Display Board (M1350-66520)
58 Chapter 6 Theory of Operation
Display Board (M1350-66520)
The display board consist of the following main parts:
Keys
Display Controller
Backlights
LEDs
Signals at the keys are fed to the recorder board via the ribbon cable and are sampled by the
controller. Display data is loaded from the recorder board to the display controller ASIC via
a serial data link. The controller multiplexes this data to the LEDs and backlights. The
multiplexer clock is served by the recorder board. The clock speed is 3.2kHz to avoid
interference between the US channel and the display multiplexer.
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