Adjusting The V Belt Tension - Brother LK3-B430E Mark II Service Manual

6-18. Adjusting the V-belt tension
e
q
1. Remove the screw q, loosen the screw w, then remove the belt cover e.
2. Press the center of the V-belt with a load of 10 N, and adjust the tension pulley r so that the V belt
deflection is approximately 9 - 10 mm.
3. Adjust the right tension pulley so that there is a gap of about 1 mm between it and the V-belt.
* When the belt tension is weak, the following problems will occur;
• Noise & vibration become large.
• Needle up stop position becomes unstable.
• Error code [E-50] is displayed.
r
LK3-B430E Mark II
r
Approx. 1 mm
Approx. 9 - 10 mm
10 N
6. ADJUSTMENT
w
50