Universal self-diagnosing appliance control

Details Universal self-diagnosing appliance control Universal self-diagnosing appliance control

1979-02-16

1981-06-23

Malzahn, David H.

Excavating

364107, 364477, 371 24, 371 29, G06F 1122, G06F 1132

Patent

active

042754640

ABSTRACT:
A microprocessor based household appliance electronic control device is equipped with self-diagnosing cacapability and with selected option capabilities. The control includes input and output lines from an integrated circuit structure through a plug connection to external circuitry. The input/output line appearances from the microprocessor in the plug connection may be decoupled from external circuitry and cross connected to each other by means of a dummy plug. Connection to the dummy plug automatically establishes a test mode of operation for the microprocessor to cycle through a testing sequence to diagnosis internal and external failures. Error codes are provided in a visual display indicative of different types of failures. The controller is also equipped with function altering circuits which are selectively connected or bypassed with strapping diodes. Customized control features are thereby achieved in a universal electronic controller.

REFERENCES:
patent: 3710350 (1973-01-01), Yoshitake et al.
patent: 4158431 (1979-06-01), Bavel et al.
patent: 4158432 (1979-06-01), Bavel
Bell et al., "Single-Chip Microprocessor Rules the Roast", Electronics, Dec. 9, 1976, pp. 105-110.

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