Singer 7422 - Sec. 2 Test Mode Operation; Test Mode Activation Steps

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Sec.2 Test mode
1. Push bobbin winder to the right
2. Push and hold reverse switch in place.
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3. Turn on power switch.
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4. Release bobbin winder while pushing reverse switch, just after power switch is turned on.
5. LED is lit at the top left corner. 
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7422, 7442,
7462
7424, 7444,
7464 and
others