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例1 故障现象:开机后,显示屏交替显示“CHECK PAPER”和“时间”不能正常收发、复印。故障检修:先检查记录纸传感器部分(RPS),该传感器为反射型光电传感器。它主要用于探测有无记录纸(探测记录纸的黑端),其型号为HHT-1238;一般多由于窗口被灰尘阻挡而不能反射信号,出现显示无纸的状态,对窗口用酒精清洁处理,仍显示“CHECKPAPER”(缺纸),然后在主控板上(SCNT)检查CN108的插座,检查①脚对地有5V电压,属正常范围,说明传感器供电路没有问题。对传感器进行动态测试,即有纸时工作电压为0.3V无纸时36V,传感器只有在此电压范围才工作正常,对CN103(RPS)和CN104(CVS)的连接端进行测试,发现均正常。通过仔细检查,发现在拆装传真机的外壳时,记录纸盖板传感器(CVS)型号为(HHT—1237)由于碰撞而未能与盖板
Example 1 Symptom: After power on, the display alternates between “CHECK PAPER” and “TIME” can not be sent and received normally. Troubleshooting: First check the recording paper sensor section (RPS), the sensor is a reflective photoelectric sensor. It is mainly used to detect the presence or absence of recording paper (detection of the black end of the recording paper), its model HHT-1238; generally more because the window is blocked by dust and can not reflect the signal, there was no paper state, the window cleaning with alcohol , Still shows “CHECKPAPER”, and then check the socket of CN108 on the main control board (SCNT). Check that there is a 5V voltage to the ground, which is within the normal range, indicating there is no problem with the sensor power supply circuit. The sensor dynamic test, that is, paper with a working voltage of 0.3V 36V without paper, the sensor only in this voltage range is working properly, CN103 (RPS) and CN104 (CVS) to test the connection and found normal. After careful inspection, it was found that when the fax machine’s case was disassembled and disassembled, the recording paper sensor (CVS) model number (HHT-1237) failed to contact with the cover