Pfaff 337 Instruction Manual page 23

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Screw the earth cable from the sewing head and the main switch to earth point A.
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Connect earth point A to earth point B with earth cable.
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Insert plug 3 from the adapter cable to bush X 2.
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Connect the motor to the "Motor" plug and the synchronizer to the "Extern" plug.
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Fasten the earth cable from plug X1 to earth point B.
Installation and commissioning
23