论文部分内容阅读
故障现象:开机后洗片,洗出来的片子很潮湿,打开洗片机后发现烘干系统电热器不工作。 分析与检修:270RA洗片机具有错误检测功能,并从液晶显示上可以表现出来,现机器自检正常而电热器不工作。从烘干温度控制电路可知,电热器是由温度传感器RT-3,过热保护开关S6,气流检测开关S3,及机器状态等信号通过500板微处理器处理,再由继电器K501和固态继电器SSR-U1来控制。温度低于预置时,SSR-U1导通,当温度到达预置时,则断开。继电器K501由过热保护开关S6,气流检测开关S3和洗片机上盖自锁开关等决定。过热保护开关S6当温度传感器RT-3或500板A/D转换失灵
Symptoms: After starting the tablet, the washed film is very moist. After opening the film processor, the drying system electric heater does not work. Analysis and Maintenance: The 270RA processor has an error detection function and can be displayed on the LCD. The machine is now self-checking and the heater is not working. It can be known from the drying temperature control circuit that the electric heater is processed by the 500-plane microprocessor through the temperature sensor RT-3, the overheat protection switch S6, the airflow detection switch S3, and the machine state signal, and then the relay K501 and the solid state relay SSR- U1 to control. When the temperature is lower than the preset, SSR-U1 is turned on, and when the temperature reaches a preset, it is turned off. The relay K501 is determined by the overheat protection switch S6, the air flow detection switch S3, and the self-locking switch of the scrubber upper cover. Overheating protection switch S6 malfunctions when temperature sensor RT-3 or 500 board A/D conversion fails