Adjusting The Bobbin Thread Supply Monitor -926/06; (Only On The Pfaff 1521) - Pfaff 521 Instruction Manual

13

Adjusting the bobbin thread supply monitor -926/06

.06

(only on the PFAFF 1521)

Requirement
When the bobbin reflection surface is aligned with the transmission and receiver unit, the
LED on the amplifier must light up and the voltage must be as high as possible.
Fig. 13 - 32
Wind the thread around the centre part of the bobbin without covering the bobbin
reflection surface.
Set the bobbin into the hook.
Connect the multimeter (measuring range DC 6.5 V) to the measuring jacks of the
amplifier. Switch on the unit.
Set the needle at t.d.c. and, by slowly unwinding the bobbin thread, align the bobbin
reflection surface with the transmission and receiver unit 1 until the LED on the amplifier
lights up.
By bending the transmission and receiver unit 1, align it so that the voltage is at its
highest.
Adjustment
1
13 - 33