Potentiometer In The Arm; Basic Setting Without Control Panel - DURKOPP ADLER 867 Service Instructions Manual

2.16 Potentiometer in the arm

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2.16.1

Basic setting without control panel

(3) (2)
54
Sewing machines with thread cutter are equipped with a potentiometer
in order to limit the driving speed of higher sewing foot strokes.
Through this potentiometer the control recognizes the sewing foot
stroke and limits the sewing speed.
2
Set sewing machines without control panel according to the following
description.
Caution: Danger of injury !
Turn 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.
4 3