The position of approaching switch for saw up is changed, and it inspects saw up signal in advance. (J160) There is interference to the approaching switch for saw up and it inspects saw up signal in advance. (J160) The pressure of the air circuit (or the oil circuit) is abnormal.The machine was worn to gaps for long time using.

Check the approaching switch for saw up.Check the circuit to fine out whether there is interference, (whether the resistance capacity absorption or the absorber diode is broken or not). Check if the layout is reasonable, earth connection is good. To change approaching switch to see whether problem can be solved.Adjust to the proper pressure.Maintain the machine.