SunStar SPS/F-2211 Series User Manual page 57

Symptoms of
No.
breakdown
5 Sewing is skipped.
Wrong sensing of
6
upper thread
Bad tightening of
7
thread
Missing thread
8
trimming occurs.
Checking factors
Improper timing of the needle
The distance between the inappropriate
groove and the shuttle point is big
Excessive tension and operating
amount of the thread take up spring.
Wrong contact of the thread take up
spring and the thread sensor plate
Wrong connection of the thread sensor
plate's electric wire
Upper thread tension is weak
Lower thread tension is weak
Inappropriate timing of the needle and
the shuttle
The crossing tension of the moving mes
and the fixed mes was released
Groove of the blade of the the moving
mes and the fixed mes was worn
Wrong position of the thread trimming
cam
Cause
Control the timing of the needle and the
shuttle again
Control the timing of the needle and the
shuttle again
Control of the thread take up spring's
tension and operating amount.
Cleaning the thread take up spring and
the thread sensor plate
Or control the tension of thread take up
spring contact to adjust the contact to
the thread sensor plate.
Connect the electric wire with the thread
sensor plate again.
Control the upper thread tension
Control the lower thread tension
Control the timing of the needle and the
shuttle
Adjust the tension of the fixed mes
Change the moving mes and the fixed
mes
Control the position of the thread
trimming cam
54