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日本常光公司生产的DENSITRON 20M是一台全自动光密度计。该仪器的光电转换部分,对光源要求较为严格,如光源灯泡衰老、光源反射镜位置调整不当等等,都可能使得机器不能正常运行。下面介绍一例因光源问题,致使主机不能扫描的故障检修。故障现象是,接通电源预热二十分钟之后,电平仪不受调;调整指示灯不亮;且按下启动键(START)时,报警器报警,扫描架不动作,启动指示灯不亮。(正常情况下,调节电平电位器,可使电平指示器指针指在绿色区域的中央位置;校正(SET)指示灯应该亮)。因为引起机器不能扫描的原因是多方面的,我们根据上述故障,首先检查了自动零位电位器和扫描架启始位置微动开关,二者均无问题。因光源灯
DENSITRON 20M produced by Japan Changguang Company is a fully automatic densitometer. The photoelectric conversion part of the instrument requires strict light source requirements, such as aging of the light source bulb, improper adjustment of the position of the light source mirror, etc., which may make the machine unable to operate normally. The following describes an example of troubleshooting due to a light source problem that prevents the host from scanning. The fault phenomenon is that after the power is warmed up for twenty minutes, the level meter is not adjusted; the adjustment indicator does not light; and when the start button (START) is pressed, the alarm alarms, the scan rack does not operate, and the startup indicator does not bright. (Normally, adjust the level potentiometer so that the level indicator pointer is in the center of the green area; the SET indicator should be on). Because the reasons that caused the machine to fail to scan were many, we first checked the automatic zero potentiometer and the scanning frame starting position microswitch according to the above faults, and both had no problem. Light source lamp