Arena Service Manual
Figure 5-6. Input (Primary) 120 and 230 VAC Configurations
The transformer has three isolated secondary windings, with output
voltages equal for all options:
• 21 VAC, this is actually a winding with a middle tap, so there
are two 21 VAC lines and one common line that supply power
to the Unregulated Power Supply. A voltage reading between
terminals 8 and 10 will be of about 42 VAC.
• 120 VAC supplies power to the Switching Power Supply and
the Venous Line Clamp Driver Board.
• 20 VAC, supplies power to the Peripheral Interface Board.
5-10 157-1278-912 Rev A
November 2003
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