Bernina B 590 Service And Maintenance Manual page 7

The power connection, the main switch, the PCBA Power, and the power cable all carry dangerous
voltages.
Therefore always disconnect the machine from the power supply before starting any work on the
machine. This applies unless otherwise instructed where required.
Note:
The capacitors require 30 seconds to discharge after the power supply has been switched off. We
recommend to wait for the complete discharging of the capacitors before starting any servicing
work on the PCBs.
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