JACK A4B

Computerized industrial sewing machine. Industrial lockstitch machine. Always match the electrical controller revision before interpreting an Err code.

Manufacturer reference linkedEdition check required

MODEL TROUBLESHOOTING

Start with the symptom, then follow the checks

Confirm your JACK A4B uses the A4B-A-C control-box edition; fault tables are not necessarily identical across controllers.

Before starting: Disconnect the machine from power before inspecting the sewing head or controller connectors. Live electrical testing is for qualified service.

How do I fix Err-08 on my JACK A4B sewing machine?

Err-08 means the sewing motor is blocked on the cited A4B-A-C controller; inspect a jammed sewing head and motor connection first.

Get step-by-step checks and outcomes →Why is my JACK A4B showing Err-03?

Err-03 indicates input undervoltage on the referenced controller. Do not open the live control box to check it.

Get step-by-step checks and outcomes →What does Err-10 mean on my JACK A4B, and how do I fix it?

Err-10 identifies a control-panel communication fault in the cited controller manual, not an instruction to replace the panel immediately.

Get step-by-step checks and outcomes →How do I troubleshoot JACK A4B Err-13?

Err-13 points to the motor Hall signal in the reference controller. Check its plug and cable before condemning the motor.

Get step-by-step checks and outcomes →

Fault codes and status indicators (23) — check version before use

Code	Meaning in the referenced data	Edition / protocol	Important
`Err-01`	Hardware overcurrent	JACK A4B-A-C RA6/AHE59 controller; AC 220V reference	Confirm installed control-panel edition
`Err-02`	Software overcurrent	JACK A4B-A-C RA6/AHE59 controller; AC 220V reference	Confirm installed control-panel edition
`Err-03`	Input undervoltage	JACK A4B-A-C RA6/AHE59 controller; AC 220V reference	Confirm installed control-panel edition
`Err-04`	Overvoltage while stopped	JACK A4B-A-C RA6/AHE59 controller; AC 220V reference	Confirm installed control-panel edition
`Err-05`	Overvoltage while running	JACK A4B-A-C RA6/AHE59 controller; AC 220V reference	Confirm installed control-panel edition
`Err-06`	Solenoid circuit fault	JACK A4B-A-C RA6/AHE59 controller; AC 220V reference	Confirm installed control-panel edition
`Err-07`	Motor-current sensing fault	JACK A4B-A-C RA6/AHE59 controller; AC 220V reference	Confirm installed control-panel edition
`Err-08`	Sewing motor is blocked	JACK A4B-A-C RA6/AHE59 controller; AC 220V reference	Confirm installed control-panel edition
`Err-09`	Braking circuit fault	JACK A4B-A-C RA6/AHE59 controller; AC 220V reference	Confirm installed control-panel edition
`Err-10`	Panel-to-controller communication failure	JACK A4B-A-C RA6/AHE59 controller; AC 220V reference	Confirm installed control-panel edition
`Err-11`	Needle-position detection failure	JACK A4B-A-C RA6/AHE59 controller; AC 220V reference	Confirm installed control-panel edition
`Err-12`	Initial motor electrical-angle detection failure	JACK A4B-A-C RA6/AHE59 controller; AC 220V reference	Confirm installed control-panel edition
`Err-13`	Motor Hall signal fault	JACK A4B-A-C RA6/AHE59 controller; AC 220V reference	Confirm installed control-panel edition
`Err-14`	DSP EEPROM read/write error	JACK A4B-A-C RA6/AHE59 controller; AC 220V reference	Confirm installed control-panel edition
`Err-15`	Motor overspeed protection	JACK A4B-A-C RA6/AHE59 controller; AC 220V reference	Confirm installed control-panel edition
`Err-16`	Abnormal motor reverse rotation	JACK A4B-A-C RA6/AHE59 controller; AC 220V reference	Confirm installed control-panel edition
`Err-17`	HMI EEPROM read/write error	JACK A4B-A-C RA6/AHE59 controller; AC 220V reference	Confirm installed control-panel edition
`Err-18`	Motor overload	JACK A4B-A-C RA6/AHE59 controller; AC 220V reference	Confirm installed control-panel edition
`Err-23`	Motor blockage / encoder fault	JACK A4B-A-C RA6/AHE59 controller; AC 220V reference	Confirm installed control-panel edition
`ALA-2`	Stitch counter reached its preset limit	JACK A4B-A-C RA6/AHE59 controller; AC 220V reference	Confirm installed control-panel edition
`ALA-3`	Thread-trim counter reached its preset limit	JACK A4B-A-C RA6/AHE59 controller; AC 220V reference	Confirm installed control-panel edition
`PaboFF`	Power-off warning	JACK A4B-A-C RA6/AHE59 controller; AC 220V reference	Confirm installed control-panel edition
`Arn UP`	Safety switch warning	JACK A4B-A-C RA6/AHE59 controller; AC 220V reference	Confirm installed control-panel edition

HARDWARE

Component & part identification

⌁

Relevant assemblies

Motor, Hall connector, synchronizer and panel harness.

Exact replacement part numbers are not displayed until documented compatibility is confirmed.