B: Theory of Operation Assemblies Descriptions
192
Display Assembly
The 7.0" color TFT LCD display support the WVGA (800(H) x 480(V) screen and 16.2M (RGB
8-bits) or 262k colors (RGB 6-bits) flat panel display illuminated by LED.
All display functions are handled by the Processor PCA. Display formats, graphics, waveforms, numeric
values and messages are all generated and formatted by the Processor PCA. The LCD display accepts
these digital data from the Processor PCA and maps it into pixels on the display.
Indicators
The Shock and Sync button backlight LEDs are mounted on the UI PCA and controlled by the
Processor PCA. The External Power and Battery backlight LEDs are mounted on the UI PCA and
controlled by the Therapy PCA.
The Shock button backlight illuminates only when the button is active (the device is shock-ready). When
using pads or switchless internal paddles, the Shock button is active and lit when the device is charged
and ready to deliver a shock. When using external or switched internal paddles, the Shock button is
disabled and not lit — the Shock buttons on the paddles are active instead.
RFU Indicator
Displays the status of the device with an hourglass indicating the device is ready for use and a solid red
“X” indicating a critical failure. This indicator is visible even when the device is turned off.
Controls
Front Panel Buttons
All of the buttons on the DFM100 front case (Charge, Shock, Sync, Alarms, Mark Event, Reports,
Printer, Lead Select, and Patient Category) and the soft keys are the silicone keys that can be separated
from the front case. All these buttons are operated by actuating the small switches mounted on the UI
PCA directly behind each button.
Presses from all buttons and soft keys are detected and processed by the Processor PCA. The Processor
PCA then interacts with the other parts of the system as needed to respond to the soft key or button
press.
UI PCA
The UI PCA contains individual discrete switches for the buttons and soft keys. The Shock and Sync
buttons are illuminated from behind by board-mounted LEDs.
Therapy Encoder
The Therapy Encoder selects operation in either AED Mode, Pacer Mode, or Manual Mode.
In Manual Defibrillation Mode, energy selection is made by rotating the Therapy Switch to the
appropriate position. The Therapy Encoder operates an optical rotary switch. The signals pass through
the switch’s ribbon cable and then on to the Processor PCA. The Processor PCA then interacts with the
other parts of the system as needed to respond to the setting of the Therapy Encoder.
The “OFF” position of the Therapy Encoder is monitored by the Therapy PCA.
Paddle Indicators and Controls
External and switched internal paddles have a Shock button located on the paddles. Additionally,
external paddles have a Charge button on the right-hand paddle. When the paddles are connected to the
defibrillator/monitor, the paddle Shock button is active and the Shock button on the
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