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Condition
Cause
The needle thread
1. Thread tension is not balanced.
appears on the
wrong side of the
fabric when the
stitch width value
is larger than "7.0".
The bobbin thread
1. The bobbin thread sensor is turned off.
detecting sensor
2. Lint has collected around the bobbin thread detecting sensor.
does not work;
3. A bobbin other than the "J" plastic bobbin is used.
There is no signal
sound when the
bobbin thread is run
out and the machine
does not stop
sewing.
The USB flash drive
1. Format setting of the USB flash drive is not correct.
2. The USB flash drive is malfunctioning.
is not read.
It is not abnormal for a faint humming sound to be heard from the internal motors.
The visual touch screen and function key area may become warm after several hours of continuous use.
137
Reference
Page 48
Page 129
Page 131
Page 25
Pages 138-139
Replace the USB
flash drive.
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