Philips M1351A, M1353A manual Recorder Interface Board M1353-66510

Recorder Interface Board (M1353-66510)

Recorder Interface Board (M1353-66510)

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The Recorder Board provides the interfaces to the recorder and the display. The recorder interface consists of:

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The parallel/serial converter for the thermal array data.

A heating timer to control the heating pulse for the thermal array. The voltage from a thermistor on the thermal array is A/D converted and the CPU programs the heating timer with a value which compensates the ambient temperature.

The recorder sensing hardware consists of a reflective light sensor that detects the black marks on the paper and paper out. A battery supervisor circuitry checks for valid battery voltages, and this is read by the CPU Board. The display interface uses the same parallel/serial converter as the recorder. The board also contains test hardware which is not shown in the diagram.

+24V is blocked by capacitor and supplied to the thermal printhead.

Chapter 6 Theory of Operation 59