JUKI IT-100 Instruction Manual page 85

No. Description of error detected
E220 Grease-up warning
E221 Grease-up error
E302 Fall detection switch failure
(When the safety switch
works)
E303 Semicircular plate sensor
error
E703 Operation panel is con-
nected to the unexpected
sewing machine. (Error of
sewing machine model)
E704 System version mismatch
E730 Encoder failure
E731 Motor hole sensor failure
E733 Inverse rotation of motor
E808 Solenoid short circuit
E809 Holding motion failure
E810 Solenoid current abnormality
E811 Abnormal voltage
E906 Operation panel transmis-
sion failure
E924 Motor driver failure
E942 Faulty EEP-ROM
Cause of occurrence expected
• When the predetermined number of stitches
has been reached.
• When the predetermined number of stitches
has been reached and the sewing is not possi-
ble.
• When fall detection switch is input in the state
that the power is turned ON.
• Semicircular plate sensor signal cannot be
detected.
• The operation panel and the sewing machine
model do not match in the initial communica-
tion.
• The system version is different from the correct
one in the initial communication.
• When the motor signal is not properly inputted.
• This error occurs when the motor is running at
500 sti/min or more in the opposite direction
of that of rotation indication during motor is
running.
• Solenoid power does not become normal volt-
age.
• Solenoid is not changed over to holding mo-
tion.
• Solenoid rare short-circuit.
• When voltage higher than guaranteed one is
inputted.
• 200V has been inputted to SC-920 of 100V
specifications.
• JA : 220V is applied to 120V box.
• CE : 400V is applied to 230V box.
• When voltage lower than guaranteed one is
inputted.
• 100V has been inputted to SC-920 of 200V
specifications.
• JA : 120V is applied to 220V box
• Inner circuit is broken by the applied overvolt-
age
• Disconnection of operation panel cord
• Operation panel has broken.
• Motor driver has broken.
• Data cannot be written on the EEP-ROM.
– 82 –
Items to be checked
• Replenish the specified places with grease
and reset.
(For the details, refer to the data of the
machine head.)
• Replenish the specified places with grease
and reset.
(For the details, refer to the data of the
machine head.)
• Check whether the machine head is tilted
without turning OFF the power switch
(sewing 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 whether the machine head corre-
sponds with the machine type setting.
• Check whether the motor encoder con-
nector is disconnected.
• Connect the operation panel to the correct
model of the sewing machine.
• Re-write the system version to the one
that can be used with the operation panel.
• Check the motor signal connector (CN39)
for loose connection and disconnection.
• Check whether the motor signal cord has
broken since the cord is caught in the
machine head.
• Check whether the inserting direction of
the motor encoder connector is wrong.
• Connection of the encoder of main shaft
motor is wrong.
• Connection for the electric power of main
shaft motor is wrong.
• Check whether the machine head cord is
caught in the pulley cover or the like.
• Check whether the solenoid is abnormally
heated. (CTL circuit board asm. Circuit is
broken.
• Solenoid resistance
• Check whether the applied power voltage
is higher than the rated voltage + (plus)
10% or more.
• Check whether 100V/200V changeover
connector is improperly set.
In the aforementioned cases, POWER
p.c.b is broken.
• Check whether the voltage is lower than
the rated voltage - (minus) 10% or less.
• Check whether 100V/200V changeover
connector is improperly set.
• Check whether fuse or regenerative resis-
tance is broken.
• Check the operation panel connector
(CN38) for loose connection and discon-
nection.
• Check whether the operation panel cord
has broken since the cord is caught in the
machine head.
• Turn the power OFF.