6-33.Test Operation - Brother S-710A Service Manual

6. ASSEMBLY
6-33. Test operation
Do not touch any of the moving parts or press any objects against the machine while sewing, as this may result
in personal injury or damage to the machine.
(1)
0789M
Treadle
(A)
(B)
(C)
If the sewing machine does not operate when the treadle is pressed
• If "of" is flashing on the operation panel, check the position of the safety switch. (Refer to the next page.)
If this does not solve the problem, refer to the description of error code "of" (page 144).
• If there is no error display on the operation panel, refer to page 140.
61
CAUTION
For machines with a lower thread detector, set the lower
thread remainder limit before carrying out test operation.
(2)
Turning on the power
Press the ON power switch (1).
The power indicator (2) will illuminate.
0790M
Test operation
0791M
1. Check that the machine sews at low speed when the
treadle is gently pressed to position (B).
Then check that it sews at high speed when the
treadle is gently pressed to position (C).
2. After pressing the treadle forward, check that the
needle is lowered to the top of the needle plate when
the treadle is returned to the neutral position (A) [when
needle down stopping has been set].
3. If the treadle is pressed to position (D) [or if it is
pressed to position (D) and then returned to the
neutral position (A)], thread trimming is carried out and
the needle then rises above the needle plate and
stops.
(D)
0792M
SL-710A