HE-800A
5. TROUBLESHOOTING
121
Cause
Check
Remedy
Page
Feed home position
sensor
Feed home position
sensor position
Adjust the feed home position sensor position.
81
Feed timing belt
Feed timing belt tension
Adjust the feed timing belt.
101
5-27. Needle does not zigzag or noise occurs when needle zigzags
Cause
Check
Remedy
Page
Zigzag home position
sensor
Zigzag home position
sensor position
Adjust the zigzag home position sensor position.
80
Stopper
Stopper position
Adjust the stopper position.
80
5-28. Sewing machine stops during sewing
Cause
Check
Remedy
Page
Thread breakage
detector
Thread breakage detector
position
Adjust the thread breakage detector position.
* If the detector is not adjusted, sewing may stop
even when the thread is not broken.
99
Pauses
Panel DIP switch A - No.
3
When panel DIP switch A - No. 3 is set to ON,
sewing will pause when the treadle is depressed
backward.
* If the treadle is depressed very firmly and then
released, the pedal may depress backward and
cause sewing to be paused.
Instruction
manual
Threading
Upper thread threading
Pass the thread correctly through the thread guide.
Instruction
manual
Error
[E-07]
Upper thread scissors
operation
Apply grease to the inclined face of the opening
cam.
94
5-29. Upper shaft does not rotate as far as the needle up stop position
Cause
Check
Remedy
Page
Thread retainer and
rotary hook are
touching.
Thread trimmer
mechanism position
⋅
Turn the machine pulley backward to set the
needle bar to the needle up position.
⋅
Push the thread driving arm in the direction of the
arrow to set the thread trimming mechanism to the
home position.
-
4026Q
Thread driving arm