Technical data

Operating the sewing unit

Operating manual 743-221-01 version 01.0 - 09/2013

7. Insert the upper bobbin case (7) back into the hook, make sure the

bobbin case flap (1) snaps into place.

8. Turn on the main switch.

9. Start a new sewing cycle.

5.7.1 Counter for the hook thread reserve

The remaining number of hook thread stitches is indicated on the display,

see  5.14 Setting the control unit, p. 34.

Resetting

1. Select the symbol hook thread counter with the arrow keys.

2. Effectuate a long stroke on the “OK” key.

 The counter is reset to its initial values.

How to set the initial value indicated by the hook thread counter is de-

scribed in the  Service Instructions.

5.8 Residual thread monitor:

The residual thread monitor controls the thread reserve on the hook thread

bobbin via reflecting infrared light barrier (1).

Fig. 10: Function Residual thread monitor

Function

After a certain number of seams the hook thread quantity on the bobbin

is used up.

(1) - Light barrier

(2) - Reflecting surface

(3) - Bobbin hub

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