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Datex-Ohmeda S/5 Anesthesia and Critical Care Monitors
8
Document no
.
M1125636-05
Over temperature protection
Over temperature possible caused by a fan failure, the fan filter is not clean or the power
supply unit is overloaded. If the temperature inside the F-CPU frame e58°C, the unit is
shut down. There is automatic recovery when the temperature decreases to +48°C. The
temperature is measured at the DC Power board.
Audible alarm for power fail
There is an option for audible alarm at power fail. This function is enabled by a switch. When
the +32V on the DC power board decreases lower than +5V, a 700Hz oscillator is switched on
for 15 sec.
Service reset button
The service reset button at the back plate of the DC Power board is for service purpose. Press
this button with an appropriate tool for at least five seconds before you remove any PC board
or the Power supply unit from the rear of the Central Processing Unit.
NOTE: Before connecting the power cord back and starting to monitor, be sure that at least one
minute has passed after the service reset button was pressed. Too short a time may lead to a
memory flaw.
2.3.2 External components
Fan
The fan is switched on automatically when +32 Vd is generated.
Loudspeaker
The loudspeaker is controlled by the audio-amplifier on the DC Power board.
Battery
6 V, 1.2 Ah sealed lead-acid battery is used to supply power to the CPU board after the power is
turned off and the power cord is disconnected.
The maximum discharge current of the battery is 1A. Charging voltage of the battery is
between 5.5V and 6.8V, the max charge current is 0.1A.
The battery is protected with a 2A fuse.
2.3.3 CPU mother board
The CPU mother board connects the CPU board and other boards, functioning as a bus
between them.
There are connectors for five PC boards. Four of those are normally occupied by B-UPI4NET
and B-CPU6 (both doublewidth boards), optional B-DISPX (reserves one slot) and DC Power
Board (reserves three slots).
The bus structure is the same as in all S/5 monitors.
ON/STBY line is connected to the B-CPU6 board’s connector from where it goes directly to the
Keyboard and ON/STBY switch.
2.3.4 Connectors
There are three connectors at the back of the DC Power board: one for connecting the N-AC
power unit with F-CPU power cable and two for connecting the F-CU5(P) with F-CPU Signal
cable.
The F-CPU Signal cable includes both power and signal (module bus) lines.
There is a DIS (Device Interfacing Solution) connector at the front of the F-CPU.
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