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Troubleshooting - Brother S-7300A Service Manual

Single needle direct drive lock stitcher with electronic feeding system and thread trimmer.
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11. TROUBLESHOOTING

11-1. Troubleshooting
・ Please check the following points before calling for repairs or service.
・ Simplified details can be checked on the panel. (Menu → Troubleshooting)
・ If the following remedies do not fix the problem, turn off the power switch and consult a qualified technician or the place of
purchase.
Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet
before opening the control box cover. Touching areas where high voltages are present can result in severe injury.
Turn off the power switch and disconnect the power cord before carrying out these operations.
The machine may operate if the treadle is depressed by mistake, which could result in injury.
Items with a "*" in the "Page" column should only be checked by a qualified technician.
Problem
1
Upper thread is not tight.
2
Lower thread is not tight.
3
Loops appear in seam.
4
Skipped
stitches
while sewing
・ Is the upper thread tension too weak? Is the lower thread tension too
strong?
Adjust the lower thread tension or upper thread tension.
Try pressing the special locus key and selecting No. 1.
0573M
・ Is the upper thread tension too strong? Is the lower thread tension too
weak?
Adjust the lower thread tension or upper thread tension.
0574M
・ Is the thread path not smooth enough?
Use a file with a fine grain or sandpaper to polish smooth the
thread path.
・ Is the bobbin turning smoothly?
Pull out the lower thread to check that there is no slackness in
the thread tension, or replace the bobbin or bobbin case.
Try pressing the special locus key and selecting No. 1.
0977M
occur
・ Is the needle tip bent? Is the needle tip blunt?
If the needle tip is bent or blunt, replace the needle.
・ Is the needle properly installed?
If it is incorrect, install the needle correctly.
・ Is the machine properly threaded?
If it is incorrect, thread the thread correctly.
・ Is the presser foot pressure too weak?
Adjust the presser foot pressure.
0470M
・ Is the needle too thin?
Replace the needle with a needle that is one rank thicker.
・ Is the presser foot too high?
Adjust the height of the presser foot.
・ Is the thread take-up spring too weak?
Adjust the tension of the thread take-up spring.
・ Is the needle and rotary hook timing correct?
Adjust the height of the needle bar.
Adjust the clearance between the needle and the tip of the
rotary hook.
DANGER
CAUTION
Possible cause
S-7300A
11. TROUBLESHOOTING
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115*
114*
128*
129*
174

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