Datex-Ohmeda S/5 Compact Anesthesia and Compact Critical Care Monitors
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Document no. M1144956-003
2.8.1 Backlights
The backlight consists of two replaceable cold-cathode fluorescent tubes driven by a separate
inverter board.
2.8.2 Connector board
The connector board is used for connecting the backlight power, keyboard and ComWheel
signals between the Central Processing Board and the Front Unit.
2.8.3 Keyboard
There are two keyboards in the Display Unit Front Unit: front panel and side panel keyboards.
The keyboards are foil membrane keypads. There is no separate processor for the keyboards.
The keyboards are connected to the UPI section of the Central Processor Board through
Connector Board.
2.9 Display Unit DC/DC power supply
This DC/DC converter board transforms primary voltage of between +10 and +18 VDC to +3.3V,
+5V, and +12 V secondary voltages. All the output voltages have common ground.
The DC/DC power supply is powered by Vbus voltage generated by the Frame Unit AC/DC
converter (mains). If the mains power fails, the DC/DC power supply is powered by batteries.
Turn-on and shut-down sequences of the DC/DC power supply are controlled by a logic on the
DC/DC board and by the Central Processor Board software. If overvoltage occurs at an output
line, the converter turns itself off automatically.
The Display Unit DC/DC converter supplies also a Display Unit fan.
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