
B–62075E/04
5. TROUBLESHOOTING
274
Fig. 5.2 (b)
For details, refer to 2.4.
9″CRT unit is faulty.
(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 from
the 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.
WARNING
When a work is conducted with power supply unit removed,
perform the work within 30 minutes (Data in memory may be
lost)
(3)Load (+5V) is grounded or short–circuited
(a) With power supply unit installed on the control unit, turn off the
power on the machine side.
(b)Remove cables (1) to (3) in the Fig. 5.2 (c), turn on power of NC
and check LED ALM.
NOTE
To release lightening of ALM, turn off NC power.
(c) When LED ALM is turned off while removing the cable, the load
connected by the removed wire may be faulty.
CAUTION
When removing the cable note the following :
1 If 6V battery is connected as shown Fig. 5.2 (c), absolute
position of the machine may be lost when cable (2) is
removed. Therefore, the machine position must be
established by reference position return ,after releasing the
alarm.
2 If 6V battery is not connected, the above operation is not
needed.