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Alpha Power ETO 91B - Page 21

Alpha Power ETO 91B
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Control Circuits (Figure 7)
Control and monitoring circuits are grouped on the Control Board, which is physically
located on the front of the 9lß subpanel. Generally, monitoring and protective functions are
clustered on the left side of the schematic, warm-up and status indicator functions at lower
right, and keying/switching functions at upper right.
Front Panel Displays (Figure 8)
The Display Board, located on the rear side of the 9 lß front panel, incorporates all indicator
LEDs and their associated driver chips. The RF forward (output) power bar graph is at top
right, reflected power bargraph center right, multimeter bottom=right, and the individual
indicator LEDs at bottom left.
Output RF Wattmeter Detector Board - See Figure 12
Multimeter Selector Switch Wiring - See Figure 13.
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