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日立757录像机能在PAL制彩电上重放NTSC磁带,但不能记录NTSC制式节目,笔者通过对该机的系统控制电路,亮度和色度电路加以改动,附加一块NTSC3.58记录控制电路板,便可使该机拥有NTSC4.43/3.58录像功能,效果令人满意。一、新增NTSC 4.43录像功能初探系统控制微处理器IC90可根据重放磁带的制式(PAL或NTSC)的不同而从(61)脚输出制式识别信号
Hitachi 757 video recorders can play NTSC tape on PAL color TV, but can not record NTSC programs, the author of the machine through the system control circuit, brightness and chrominance circuit to be modified, add a piece of NTSC3.58 recording control circuit board, then This machine can have NTSC4.43 / 3.58 recording function, the effect is satisfactory. First, the new NTSC 4.43 video recording function system control microprocessor IC90 according to the format of the playback tape (PAL or NTSC) from the (61) pin output standard identification signal