Series 16/18/160/180-Model C Maintenance Manual, GFZ-62755EN ...

8. TROUBLESHOOTING B–62755EN/01(2)Power supply unit is faulty.(a) Remove connector CP2, CP3, CP5, and CP6.(b) Turn off the power of the machine and retract the power unit fromthe controller.(c) Turn on power of NC.(d) When LED ALM is lit, power unit is faulty.If ALM is not lit, power supply unit is normal.CAUTIONWhen a work is conducted with power supply unit removed,perform the work within 30 minutes (Data in memory may belost)(3)Load (+5V) is grounded or short–circuited.(a) With power supply unit installed on the control unit, turn off thepower on the machine side.(b) Remove cables and in the figure below, turn on power of NCand check LED ALM.CAUTIONTo release lightening of ALM, turn off NC power.(c) When LED ALM is turned off while removing the cable, the loadconnected by the removed wire may be faulty.CAUTIONWhen removing the cable note the following :1 If 6V battery is connected as shown below, absolute positionof the machine may be lost when cable is removed.Therefore, the machine position must be established byreference position return ,after releasing the alarm.2 If 6V battery is not connected, the above operation is notneeded.300