Potentiometer In The Arm; Basic Setting Without Control Panel - Dürkopp Adler M-Type 869 Serviceanleitung

2.15 Potentiometer in the arm

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2.15.1

Basic setting without control panel

(3) (2)
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Sewing machines with thread cutters are fitted with a potentiometer to
limit the speed with larger sewing foot strokes. The control unit
detects this potentiometer in the sewing foot stroke and restricts the
speed.
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Sewing machines without a control panel must be adjusted as
described below.
Caution: Danger of injury!
Turn off the main switch.
Only set the potentiometer when the sewing machine is switched off.
–
Unscrew the arm cover.
–
Remove plug 3 of the potentiometer from circuit board 4.
–
Check the resistance on the terminals (2) and (3) of the
potentiometer with an ohmmeter
Terminal (3) = green wire
Terminal (2) = brown wire
Reading: 7.1 - 7.3 kOhm
If the above values are not correct the setting of the potentiometer 2
must be corrected.
–
Undo screw 1.
–
Set the shaft of the potentiometer 2 to the corresponding value.
–
Insert the potentiometer completely into the regulating shaft hole
and screw in screw 1.
–
Insert plug 3 of the potentiometer into circuit board 4.
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