JUKI LK-1900AN Engineer's Manual page 123

Trouble
14. Error E901
Main shaft motor IPM Error
LED3 on SDC board: Flashing 5 times
15. Error E903
Pulse motor source error
LED3 on SDC board: Flashing 11 times
16. Error E904
Solenoid power source error
LED3 on SDC board: Flashing 12 times
Cause (1)
14-1) The main shaft mo- 1-A) IPM heat generation is exces-
tor driving IPM in the
SDC board generates
an error output
1-B) The main shaft motor is out of
1-C) The driver circuit is out of
15-1) No +85V power out- 1-A) Fuse F1 of the SDC board is
put of the SDC board
available
1-B) Fuse F4 of the SDC board is
15-2) There is a deviation 2-A) The power circuit is out of
of more than ±15%
in the +85V source of
the SDC board.
16-1) No +33V power out- 1-A) Fuse F2 of the SDC board is
put of the SDC board
available
1-B) Fuse F5 of the SDC board is
16-2) There is a deviation 2-A) The power circuit is out of
of more than ±15%
in the +33V source of
the SDC board.
Cause (2)
sive.
order.
order.
broken.
broken.
order.
broken.
broken.
order.
Check and corrective measures
Check whether electric box cooling is effec-
tive. Look for clogging around air suction
holes and check the fan, etc.
Disconnect CN16 of the SDC board and
check the resistance among pins. [See the
Servo Motor Circuit Diagram.]
Replace the SDC board.
Check for the presence of short-circuiting in
the +85V system of the MAIN board. Elimi-
nate the cause and replace the fuse.
Replace the SDC board.
Replace the SDC board.
Check for the presence of short-circuiting in
the +33V system of the MAIN board. Elimi-
nate the cause and replace the fuse.
Replace the SDC board.