11 - 51
Adjustment
Fig. 11- 47
1
11.08 Adjusting the bobbin-thead supply monitor -926/06
(On the PFAFF 1526 carry out this adjustment on both hooks)
Requirement
When the reflection surface is positioned at the transmitting and receiving unit, the
luminous diode on the amplifier must light up and the highest possible voltage applied.
● Wind thread onto bobbin core without covering the bobbin reflection surfaces.
● Insert bobbin in hook.
● Connect amplifier on control box.
● Turn rotary potentiometer on regulator amplifier, part No. 71-8500-0091 to set highest
voltage (P
max
).
● Connect multiple tester (measuring range DC 6.5 V) to measuring sockets of amplifier.
Switch on tester.
● To position the bobbin reflection surface at transmitting and receiving unit 1, pull the
bobbin thread slowly until luminous diode on amplifier lights up.
● Position transmitting and receiving unit 1 by bending it so that the voltage reading is at its
highest.
● If the voltage rises above 6.5 V, reduce it to 3 V and repeat this procedure until the
highest possible voltage is obtained.
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