GE Eagle 1000, Servicing Instructions

Page: 32 / 148

GE Medical Systems EAGLE 1000
Page 32
Information Technologies
Servicing Instructions 227 468 01 Rev.G
The keypad is used to enter data, the beeper to give alarms and acknowledgment sig
nals. The recorder interface leads to the integrated recorder and the CPU interface to the
liquid-crystal screen.
The RS 232 interface acts as a system output, it is mainly used for sending signals to the
QuickLink to output data to the HELAN after patient relocation and transportation.
The Nurse Call interface leads to the nurse call adapter. A nurse call system can be
connected by means of the nurse call relay for the Eagle 1000. From Version 2.1 and
higher, a 20 mA current loop is available to connect the Eagle to an OctaBus of a SynOp-
sis Central Station.
The patient data inputs are entered via three serial interfaces:
The QSPI interface allows the transfer of ECG, temperature and the two invasive blood
pressures via the 16 “Qued Processor Interface” signals. One chip select signal each is
generated for each of the three signal groups. A clock signal synchronizes the transfer of
the two “Master In - Slave Out” and “Master Out - Slave In” signals.
The PCBs Oximeter and Non-Invasive Blood Pressure are each connected separately via
an asynchronous interface. This has both an Rx and a Tx cable as well as a reset cable.
Another EC.Syn signal is provided for the oximeter (Sp02), another RESETB signal for the
non-invasive blood pressure (NBP).
2.2.6 Display
see “Display block diagram”
All of the elements shown apart from the block “display” are located on the PCB ECG
Monitor.
The LCD display is controlled by an LCD controller. This works together with an external
3.6MHz oscillator and external display RAM. The control of the LCD controller is effected
via the CPU interface.
The LCD display is controlled by a -23V power supply. This voltage is acquired from the
battery voltage supply. The contrast on the PCB ECG Monitor must be adjusted.
The display has a reverse video feature which is supplied with 300 V AC at 30 to 40 Hz
from a CCFT supply. In open-circuit operation this is approx 565 V.
Warning: Avoid contact with this voltage where it is exposed on the PCB ECG
Monitor.