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Brother S-7200B Service Manual page 78

Single needle direct drive straight lock stitcher with thread trimmer
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13. TROUBLESHOOTING
Error code
Err
12
(Solenoid power
supply error)
Err
13
(Treadle unit
error)
Err
14
(Head detector
unit error)
Err
15
(Problem with
sewing machine
motor operation)
Err
16
(Thread trimming
solenoid timeout)
Err
18
(EEROM error)
Err
19
(Control box
overheating)
Err
20
(Treadle pedal
position error)
71
Is solenoid fuse F2 (5A) blown?
Replace the fuse.
Problem with control P.C. board.
Replace the control box.
Is the treadle unit connector inside the control
box disconnected?
Insert the connector securely.
Is there an open circuit in the treadle
connector harness?
Replace the treadle unit.
Problem with head detector unit
Check that the head detector unit
connector inside the control box is
securely inserted.
Replace the head detector unit.
Problem with motor.
Replace the motor.
Problem with power P.C. board.
Replace the control box.
This is displayed if the sewing machine motor locks during thread trimming.
Remove any thread scraps that may be blocking the motor.
Check that there are no problems with the thread trimming mechanism.
This is displayed if data could not be correctly read from or written to the memory
element on the control P. C. board.
Replace the control box.
This is displayed when the control box becomes abnormally hot. (Three-phase
high-voltage specifications only)
Check that there are no problems with the cooling fan.
If there is a problem, replace the cooling fan.
The settings in "Setting method for standard depression stroke" may be incorrect.
Redo the settings in "Setting method for standard depression stroke".
Problem with treadle unit.
Replace the treadle unit.
Possible cause
S-7200B
Page
53
49
3702M
52
3158M
52
3703M
39
49
49
58, 60

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