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

B–62755EN/018.TROUBLESHOOTING8.2POWER CANNOT BETURNED ONPointsCauses and Remedies1 LED is turned offConfirm the green LED PIL and red LED ALM on the front of power unit.1) Proceed to item 1 when green LED PIL is turned off.2) Proceed to item 2 when green LED is lit and red LED AML is turnedoff.3) Check item 3 when red LED ALM is lit.(1)Fuse F1 or F2 on the power unit front panel is blown.(a) Input power voltage is too high.(b) Power unit is faulty.(2)Input voltage is lowMeasure voltage at R and S terminals of connector CPI to confirmappropriate voltage is supplied.If it is not normal, check machine side magnetics circuit.200VAC, +10%, 50/ 60Hz, 1Hz, 1220VAC, +10%, 60Hz, 1Hz, 12 Conditions for power onare not satisfied.(PIL islit and ALM is off)(3)Power supply unit is faulty.Conditions for power on are as follows:Power supply unitALContacts of external alarmis open.ON buttonONContacts of power on isclosed.COMOFFOFF buttonContacts of power off isclosed.3 LED ALM is litFor details, refer to 2.5.1 Power Supply Unit.(1)Fuse F3 is blown on the front panel of power unit.Check whether +24V is short–circuited or grounded. (See figurebelow).Regulator+24V F3CP5CN2CP5LCD/MDI,9CRT/MDIUnitFor details, refer to 2.4.9CRT unit or LCD unit is faulty.299