Brother LH4-B800E Service Manual page 108

4. Adjustment
After moving the lower thread trimmer cam lever y back in the direction of the arrow, move the feed mechanism.
*
y
If the feed mechanism is moved when the lower thread trimming has been carried out, the mechanisms will press
against each other, which may result in damage to the lower thread clamp t and the opening plate r.
r
t
LH4-B800E
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