Instruction manual

2.13 Potentiometer in the arm

Sewing machines with thread trimmer are equipped with a

potentiometer in order to limit the sewing speed of higher sewing foot

strokes. Through this potentiometer the control unit recognizes the

sewing foot stroke and limits the sewing speed.

2.13.1 Basic setting without control panel

Set sewing machines without control panel according to the following

description.

Caution: Risk of injury!

Tur n off the main switch.

Set the potentiometer only with the sewing machine switched off.

–

Pull out the plug 3 of the potentiometer on the PCB 4.

–

Check the resistance on the terminals (2) and (3) of the

potentiometer with an ohmmeter. Terminal (3) = green wire

Terminal (2) = brown wire Measuring value: 7.1 to 7.3 kOhm

If the values mentioned are not correct, the position of the

potentiometer 2 has to be adjusted.

–

Loosen screw 1.

–

Set the shaft of the potentiometer 2 to the corresponding value.

–

Push the potentiometer completely into the bore hole of the

setting shaft and tighten screw 1.

–

Plug in plug 3 of the potentiometer on the PCB 4.

(3) (2)