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8/COMPONENT LAYOUT AND SCHEMATIC
Display Lamps The red “ABNORMAL” lamps (DS1-DS6) are LED arrays
consisting of four LED’s each. A 150 ohm series resistor is
The green “NORMAL” LED (DS7) is a single LED that provided for each LED bar to provide a dc forward current of
uses a 390 ohm series resistor to develop the dc forward 22 ± 4 mA during the energized state. Each abnormal
current of 22 ± 4 mA. The green “NORMAL” lamp glows lamp corresponds to one of the pressure inputs. If no
when all pressure inputs are within specified (NORMAL) alarm conditions exist, none of the red “ABNORMAL”
limits. Should any single or multiple pressure input LED’s should be on. The only time the green “NORMAL”
deviate from the normal limit(s) the green “NORMAL” lamps should be on simultaneously is when the “TEST”
LED will be deenergized and the appropriate red switch is depressed.
“ABNORMAL” lamp bar(s) will be energized.
Schematic for printed circuit control/display
board code
1 2
Figure 29
Control/Display Board
8-2 0178-0135-000 Rev. A
