NEC Versa 550 Series Service Manual page 84

Field Service Guidelines 4-13
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DC-DC Converter Powerboard Module
The Powerboard module basically converts the input 8V-20V DC voltage to
several voltage levels needed in powering every components inside the note-
book. This PCB module is located on the left rear side of the base unit and is
connected to the Motherboard's 8-pin DIP and 18-pin SMT female connector.
Figure Section 4-6 System Base Unit Assembly