GE CARESCAPE Monitor B850, Service Manual

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Theory of operation
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• It has a non-volatile flash memory for the BIOS a volatile SDRAM memory for run time
code execution and temporary data storage.
• A detachable, non-volatile flash memory, USB Disk On Module (uDOM), is used as the
permanent memory for application and service software, and to store clinical and
platform settings. The uDOM may hold two versions of the software in different partitions:
inactive and active.
System supervision:
•
Watchdog timers control the operation of the main processor.
• The processor board has battery backed-up real-time clock to store system date and
time.
Video and audio system:
•
The processor board controls the generation of audible tones and displayed information
for analog and digital type displays.
Support for interfaces:
•
The processor board provides support for the communication channels to support M-Port
peripherals, ePort/Tramnet (eT-Ports) connected acquisition systems, the CARESCAPE or
S5 Network, USB devices and Serial Devices.
9.2.3 Speaker Assembly
The speaker is used for audible tones: beat tone and alarms.
9.2.4 Bottom Chassis, Top and Back Cover
The bottom chassis houses the processor board, power supply, speaker and light pipe
assembly. The bottom chassis provides the means for mounting the CPU unit to GCX or other
mechanical mounts. The light pipe assembly transmits light from a LED on the processor board
to the front panel of the CPU unit for presence of 5V DC.
9.2.5 User interface
The M-Port based keypad, USB touchscreen, USB remote control, USB keyboard or an USB
mouse provides the user interface for the patient monitor. The USB remote control is
connected to one of the USB ports at the CPU unit or at the display using a USB2.0 cable. The
keyboard and mouse are connected to the CPU unit using the USB connectors. The keypad
uses an M-Port on the front panel of the CPU unit.
•
A green LED illuminates on the front of panel of the CPU unit when the unit is powered.
• A Service Monitor - Low Battery message is put on the display for a low lithium battery.
• Power on/off switch is lit green when it is in ON condition and power is present.
Power failure alarm
The following applies to the D19KT VER01 display only.
If there is a power failure (e.g., the supply mains is interrupted or the USB cable is
disconnected), the CARESCAPE D19KT VER01 display gives a continuous beeping alarm. This
alarm remains active for as long as there is some residual power left, or until it is silenced with
the Trim Knob or the standby button, or until the USB cable is reconnected or the supply mains
is restored. A power failure alarm is also indicated by the alarm light flashing yellow.