一台松下NV—F55录像机一插电源,三秒后,多功能显示计数器的工作状态显示由“OO”跳变为“E9”。随之录像机进入锁定状态,任何功能全无,VTR电源开关也不起作用。分析:新一代的松下录像机都具有自我检测功能。对F55机,当同时按下“EJECT”、“FF”和“REW”三键时,由微处理器IC_(6001)和IC_(7501)联合工作可以知道当前机器工作在何种状态。并由录像机的显示屏将内容表示出来。见图1所示,例如:“2”表示,磁带出仓状态;而 A Panasonic NV-F55 VTR plugged in a power supply, three seconds later, multi-function display counter working status display from “OO” jump to “E9”. The video recorder then enters a locked state, with no function at all, and the VTR power switch does not work either. Analysis: A new generation of Panasonic video recorders have self-testing capabilities. For F55, when the three keys of “EJECT”, “FF” and “REW” are pressed at the same time, the working state of the current machine can be known by the cooperation of the microprocessor IC_ (6001) and IC_ (7501) The contents of the recorder will be displayed by the video recorder. Shown in Figure 1, for example: “2” that the tape out of storage status;