Philips M1353A, M1351A manual Display Board M1350-66520

Display Board (M1350-66520)

Display Board (M1350-66520)

pegdbd40

The display board consist of the following main parts:

Keys

Display Controller

lBacklights 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.

58 Chapter 6 Theory of Operation