论文部分内容阅读
故障现象 开机,有电源指示,但控制面板仅选台指示灯“STA”亮,收片杆动作,其他均无指示或动作检测分析 Multispot FA是用Z80 CPU来实现微机控制,正常时,一开机应执行一系列的初始化程序;象帧位置及照片模式指示,内部监示屏位置复位动作等,但“STA”灯指示及收片杆动作不需初始化程序执行,表明CPU未执行初始化程序,故障可能有以下几点。(1)供微机控制电路用的+5V电源故障;(2)中央处理蕊片CPU复位电路故障;(3)Z80 CPU本身故障;(4)固化程序EPROM故障。显然,后两种故障存在的可能性较小,先
Symptoms Power on, there is power indication, but the control panel only selects the station indicator “STA” is lit, the rod is moving, no other instructions or motion detection analysis Multispot FA is to use Z80 CPU to achieve computer control, normal, a boot A series of initialization procedures shall be performed; such as frame position and photo mode indications, internal monitor screen position reset actions, etc., but the “STA” lamp indication and the ram action do not require an initial program execution, indicating that the CPU is not performing the initialization procedure. There may be the following points. (1) Failure of +5V power supply for microcomputer control circuit; (2) Central processing CPU chip reset circuit failure; (3) Z80 CPU itself failure; (4) Failure of curing program EPROM. Obviously, the latter two kinds of faults are less likely to exist.