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答:从现象上分析,由于点片和短时间档时限基本正常,充电电容C_(401)和J_1继电器的通、断电路正常。这样应检查:①在长间摄影档时,转按开关XK_2-300是否转到位;②长时间摄影档充电电阻是否变值;③JC_221-22接点是否短路,因为以上三部分不正常都能引起充电时间变短,影响限时。例如,当JC_221-22接点断开时,电源经点片档电阻和BG_(4o8)也对C_(401)充电,使限时缩短。但这种影
Answer: From the phenomenological analysis, due to the fact that the timing of the spot and the short time is basically normal, the on and off circuits of the charging capacitor C_(401) and the J_1 relay are normal. This should check: 1 in the long-term photography file, press the switch XK_2-300 is turned to the position; 2 long-term camera file charging resistance is changed; 3JC_221-22 contact is short circuit, because the above three parts can not be caused by charging The time becomes shorter and affects the time limit. For example, when the contact of JC_221-22 is disconnected, the power is charged to C_(401) via the spot resistor and BG_(4o8), which shortens the time limit. But this shadow