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Side view on the opened OM4001A
HV supply board AC Selector SW ON board
HV Transformers
Remove the upper lid first. On the right side of the PA, there are two PCBs mounted. On the
right upper side is Switch ON board where AC selector is located.
There are AC selector for each
transformer. The blue wire – one side
of primary winding is conected to N
pole. Wire marked with proper voltage
connect to L pole.
AC voltage is marked at every black
terminals.
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