Brother KE-430B Service Manual page 13

１-２-１. Measuring tension
Upper thread tension
Thread take-up spring height
* When the spring height (stroke) is great or the spring tension is insufficient, it may cause the thread end length to vary after
thread trimming.
Lower thread tension
3564Q
Thread take-up spring tension
Measure the value when the thread take-up
spring starts to extend.
3566Q
KE-430B, 430C series
1. SPECIFICATIONS
1–2 mm
3565Q
3567Q
6