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Side view on the opened OM2501A (OM3501A)
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.
AC selector range can be changed according to the specific conditions in individual countries. Default
settings is 220, 230, 240V / 50Hz for EU market and 230, 240, 250v / 60Hz for USA market. If you
need different settings in the range of 200 – 260V, this should be specified in the order!
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