Potentiometer In The Arm; Basic Setting Without Control Panel - Dürkopp Adler 867 Service Instructions Manual

2.15 Potentiometer in the arm

2
2.15.1

Basic setting without control panel

(3) (2)
46
Sewing machines with thread trimmer 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 driving speed.
1
Set sewing machines without control panel according to the following
description.
Caution: Danger of injury !
Turn the main switch off !
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 potentiometer's 2 position
is 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