Duo™ Service Manual 0070-10-0604-01 1 - 3
Theory of Operation Hardware Overview
FIGURE 1-2 Power Supply Block Diagram
Power Supply Voltage Test Points:
Location Function
Measure across C5 Primary Rectified Voltage (DC). Range: 105 - 374 volts.
C5 Negative Lead Primary Ground.
Measure across Q1 pin1 and
C5 Negative Lead
110k Hz Drive frequency.
Measure across C12 +10.5 vdc input for Fan Driver board.
C12 Negative Lead Secondary Ground.
C47 Positive Lead +5 vdc supply for Power On/Off Control.
C50 Positive Lead +3.3 vdc output.
C68 Positive Lead +12 vdc output.
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