Brother International S-7200B Service Manual - Page 78

Remove any thread scraps that may be blocking the motor.

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13. TROUBLESHOOTING Error code Err 12 (Solenoid power supply error) Possible cause Is solenoid fuse F2 (5A) blown? Replace the fuse. Err 13 (Treadle unit error) Err 14 (Head detector unit error) 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. Page 53 49 3702M 52 3158M 52 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) Problem with motor. Replace the motor. Problem with power P.C. board. Replace the control box. 3703M 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. 39 49 49 58, 60 71 S-7200B

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S-7200B
13. TROUBLESHOOTING
71
Error code
Possible cause
Page
Err
12
(Solenoid power
supply error)
y
Is solenoid fuse F2 (5A) blown?
Replace the fuse.
y
Problem with control P.C. board.
Replace the control box.
53
49
Err
13
(Treadle unit
error)
y
Is the treadle unit connector inside the control
box disconnected?
Insert the connector securely.
y
Is there an open circuit in the treadle
connector harness?
Replace the treadle unit.
52
Err
14
(Head detector
unit error)
y
Problem with head detector unit
Check that the head detector unit
connector inside the control box is
securely inserted.
Replace the head detector unit.
52
Err
15
(Problem with
sewing machine
motor operation)
y
Problem with motor.
Replace the motor.
y
Problem with power P.C. board.
Replace the control box.
39
49
Err
16
(Thread trimming
solenoid timeout)
y
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.
Err
18
(EEROM error)
y
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.
49
Err
19
(Control box
overheating)
y
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.
Err
20
(Treadle pedal
position error)
y
The settings in “Setting method for standard depression stroke” may be incorrect.
Redo the settings in “Setting method for standard depression stroke”.
y
Problem with treadle unit.
Replace the treadle unit.
58, 60
3703M
3702M
3158M