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4 Port Diagram
12P Function Port Description
1. Thread trimming electromagnet: 1, 8 (+32V)
2. Thread wiping/ thread clamping electromagnet: 2, 9 (+32V)
3. Thread tension releasing electromagnet: 3, 10 (+32V)
4. LED Light: 4 (DGND), 11 (+5V)
5. Reverse stitch key: 5 (signal)
6. Mending stitch key: 7 (signal)
2P Function Port Description
1. Presser foot electromagnet: 1, 2 (+32V)
6P
Function Port Description
3. Check if there is oil on the grating code plate, if so, please clean it up, and
restart the system after restoration;
4. If it still does not work normally, please replace the control box or
back-tacking stepper motor and notify the after-sales service.
E87
Back-tacking stepper motor
locked-rotor
1. Turn off the system power and observe whether back-tacking stepper motor is
stuck. If it is stuck, remove the mechanical failure of the machine first. If it is
normal, check whether the power cord connector of back-tacking motor and the
encoder connector are loose or fall off, restore them to normal and restart the
system.
2. If it still does not work normally, please replace the control box or
back-tacking stepper motor and notify the after-sales service.