Needle Does Not Zigzag Or Noise Occurs When Needle Zigzags; Sewing Machine Stops During Sewing - Brother LH4-B800E Service Manual

5. Troubleshooting guide

5-18. Needle does not zigzag or noise occurs when needle zigzags

Cause
Zigzag home Zigzag home position
position sensor position
sensor
Stopper Stopper position

5-19. Sewing machine stops during sewing

Cause
Thread Thread breakage
breakage detector position
detector
Emergency Panel DIP switch A-3
stop
5 - 18
Check
Adjust the zigzag home
position sensor
position.
Adjust the stopper
position.
Check
Adjust the thread
breakage detector.
When panel DIP switch
A-3 is set to ON, an
emergency stop occurs
when the treadle is
depressed.
Solution
Solution
If the detector is not adjusted,
sewing may stop even when the
thread is not broken.
If the treadle is pressed firmly and
then released, the treadle may be
judged to have been depressed
backwards and an emergency stop
may occur.
LH4-B800E
page
4-2
4-2
page
4-24
-
(Instruction)