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网控板电路是连接传真机和外线的桥梁,是重要组成部分。它也是传真机在使用过程中常出现故障的部分,不管哪种型号传真机网格控制板都能实现七种功能即控制传真/电话转换、发送/接收电路转换、拨号单音转换、摘机检测、NAK单音信号检测及程控交换机的连接等功能。现以OF—17传真机为例来分析网控板电路。OF—17网控板NCU—123V电路框图如图1所示。
Network control board circuit is to connect the fax machine and the bridge outside, is an important part. It is also part of the fax machine in the course of failure, no matter what type of fax machine grid control panel can achieve seven functions that control the fax / telephone conversion, send / receive circuit conversion, dial tone conversion, off-hook detection , NAK tone signal detection and program-controlled switches and other functions. Take OF-17 fax machine as an example to analyze the network control board circuit. OF-17 network control board NCU-123V circuit block diagram shown in Figure 1.