Chapter 2 - Electronics; Electronics; Pcba-Power; Pcba-Ret - Bernina 330 Service And Maintenance Manual

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The electronics of the BERNINA 330, 350 and 380 are for the most part housed on three PCBAs (printed

circuit board assemblies).

Do not remove or plug in any connections when the sewing computer is switched on or

connected to the power supply.

The PCBA power is fitted on the back of the sewing machine.

The circuit parts on the PCBA power generate the following DC

voltages:

•

5V/DC:

For the logics on the PCBA base.

•

12V/DC:

For the sewing light.

•

31V/DC:

For the main motor, winding motor and

stepping motors.

The fuses F2 and F3 protect components against overload in the

event of malfunction. If a fuse blows, this is always for a reason.

The cause must be identified and eliminated. The PCBA power

and PCBA base are connected with an 8-pin ribbon cable.

The PCBA-RET is mounted in the front cover. The microswitch captures the

actuating of the Return button as well as the Start/Stop button.

BERNINA International AG · Seestrasse 161 · CH-8266 Steckborn · Switzerland

Chapter 2 – Electronics

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350 350 pe 380