Theory of operation
2-56
10070389 Rev. A
Puritan Bennett™ 700 Series Ventilator System Service Manual
The multiposition
knob encoder
(Figure 2-44) permits setting selections or changes. It
operates according to the same principles as the optical encoder used with the motor (see
Section 2.2.2). A knob decoder on the controller PCB determines the direction and position of
the shaft based on encoder outputs.
Figure 2-40. User interface (UI)
Knob
Front view
7-00152
Keyboard assembly
(740 Ventilator shown)
Rotary encoder
UI display PCB
7-00153
4 x 20 LCD panel
(message window)
Summary of Contents for Puritan Bennett 700 Series
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