METHOD AND APPARATUS FOR ESTABLISHING A SERVICING MODE OF AN ELECTRONIC APPARATUS

摘要

39-0100.2087PATENTABSTRACT OF THE DISCLOSUREIn controlling an electronic apparatus, such as, acolor television receiver, of the type having signalprocessing circuits which are individually adjustable inaccordance with respective control signals provided by amicrocomputer or central processing unit (CPU) in responseto data corresponding to predetermined or standardizedconditions of the adjustable circuits and which are storedin a non-volatile memory along with a secret code, operatingkeys selectively actuable to provide input data to the CPUfor representing an externally applied code and, in aservicing mode of the receiver, for rewriting the data inthe memory and thereby changing the standardized conditionsof the adjustable circuits, and inner bus lines connectingthe CPU to the adjustable circuits, the non-volatile memoryand the operating keys; a standby power supply provideselectric power to the CPU at a time when operating keys areactuated for inputting data representing an externallyapplied code to the CPU, a main power supply is turned onfor supplying power to the adjustable circuits and therebycausing the receiver to display a color image, and theservicing mode of the receiver is established only when theexternally applied code coincides with the stored secretcode and the turning on of the main power supply is effectedwithin a predetermined period after the externally applied-2-SONY:1939-0100.2087PATENTcode has been made to be coincident with the stored secretcode.