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佳木斯电视机厂生产的龙江牌20英寸7755JM遥控彩色电视机,是在采用 TA7680AP、TA7698AP两片大规模集成电路完成图像、伴音信号接收的基础上,用微处理器 MN14821JTB 实现面板手控和红外遥控,使电视机自动完成屏幕显示、波段转换、调谐、音量等各种控制功能。本文仅介绍该机的遥控系统原理及故障检修。一遥控原理(一)遥控发射电路遥控发射电路如图1所示,主要由集成块 IC_(01)(M50142P)、石英振荡器晶体 CF_1、键盘、干电池、红外发光二极管 D_(01)等元器件组成。CF_1、C_(02)、C_(03)组成的外部石英晶体振荡电路,连接在 IC_(01)的脚①、脚
Jiamusi Television Factory Longjiang licensing 20-inch 7755JM remote color TV set, is the use of TA7680AP, TA7698AP two large-scale integrated circuits to complete the image, sound signal reception, based on the microprocessor MN14821JTB panel to achieve manual and infrared Remote control, so that the TV automatically screen display, band conversion, tuning, volume and other control functions. This article describes only the aircraft remote control system principle and troubleshooting. A remote control principle (A) remote control transmitter circuit Remote control transmitter circuit shown in Figure 1, mainly by the integrated block IC_ (01) (M50142P), quartz oscillator crystal CF_1, keyboard, battery, infrared light-emitting diode D_ (01) and other components composition. CF_1, C_ (02), C_ (03) composed of an external quartz crystal oscillator circuit connected to the foot of IC_ (01) ①, feet