E302 Fall detection switch failure
(When th e safet y switc h
works)
• When fall detection switch is input in the
state that the power is turned ON.
• Thread trimming knife position is not cor-
rect.
• Machine-head tilt detector's connector has
come off.
• Check whether the machine head is tilted
without turning OFF the power switch (sew-
ing machine operation is prohibited for safety
sake).
• Check whether the fall detection switch cord
is caught in the sewing machine or the like.
• Check whether the fall detection switch lever
is caught in something.
• Check whether the contact of the tilt detec-
tion switch lever with the machine table is
inadequate. (The table has a dent or the
mounting location of the bed strut is too far.)
• Check the machine-head tilt detector's con-
nector (CN48) for looseness and slip-off.
E303 S
emicircular plate sensor
error
• Semicircular plate sensor signal cannot be
detected.
• Check whether the machine head corre-
sponds with the machine type setting.
• Check whether the motor encoder connector
is disconnected.
E331 Tape cutter device sensors
are turned ON simultane-
ously
•
Faulty operation of the tape cutter device. • Check whether the tape cutter device is con-
nected properly.
• Check whether the pneumatic pressure is
adequate.
E332 T
ape cutter device sensors
are turned OFF simultane-
ously
• Faulty assembly and adjustment of the
tape cutter device.
• Check whether the tape cutter device is
properly assembled.
• Check whether the pneumatic pressure is
adequate.
E499 Data fault •
The stored data have broken. • Reset all data on the function setting to the
default values referring to "Initializing the
function setting data" in the Engineer's Man-
ual.
E704 Data fault •
The stored data have broken. • Reset all data on the function setting to the
default values referring to "Initializing the
function setting data" in the Engineer's Man-
ual.
E730 Encoder fa
ilure • When the motor signal is not properly in-
putted.
• Check the motor signal connector (CN30) for
loose connection and disconnection.
• Check whether the motor signal cord has
broken since the cord is caught in the ma-
chine head.
• Check whether the inserting direction of the
motor encoder connector is wrong.
E731 Motor hole sensor failure
E733
Inverse rotat
ion of motor • This error occurs when the motor is run-
n
ing at 500 sti/min or more in the opposite
direction of that of rotation indication dur-
ing motor is running.
• Connection of the encoder of main shaft
motor is wrong.
• Connection for the electric power of main
shaft motor is wrong.
E799
T
hread trimming operation
time-out
• The thread trimmer control operation is
not completed within the predetermined
time period.
• Check whether the function setting No. 95
(Head selection function) has been set cor-
rectly.
•
Check whether the motor pulley diameter
agrees with the setting.
• Check whether the belt has slackened.
E808 Soleno
id short circuit • Solenoid power does not become normal
voltage.
• Check whether the machine head cord is
caught in the pulley cover or the like.
E809 Hold
ing motion failure • Solenoid is not changed over to holding
motion.
• Check whether the solenoid is abnormally
heated. (CTL circuit board asm. Circuit is
broken.)
E810 Solenoid current abnormal-
i
ty
• Solenoid rare short-circuit. • Solenoid resistance.
No.
Description of error detected
Cause of occurrence expected Items to be checked
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