Mindray PM-7000, Service Manual

Page: 17 / 82

Chapter 2 Principles
5
2.1.1 Parameter Measurement
The parameter measurement and monitoring are the core functions of the patient monitor. The
parameter measurement part of the PM-7000 consists of the measurement probe, parameter
input socket assembly, NIBP assembly and the main control board.
This part converts the physiological signals to electric signals, processes the those signals and
conducts the calculation by the preset program or command delivered from the main control
board, and then sends the values, waveforms and alarm information (which will be displayed
by using the man-machine interface) to the main control board.
2.1.2 Main Control Part
In the PM-7000, the main control part refers to the main control part of the main control board.
It drives the man-machine interface, manages the parameter measurement and provides
users with other special functions, such as storage, recall of waveforms and data. (See Figure
2-1)
2.1.3 Man-Machine Interface
The man-machine interface of the PM-7000 includes the TFT display, recorder, speaker,
indicator, buttons and control knob.
The TFT display is the main output interface. It, with the high resolution, provides users with
abundant real-time and history data and waveforms as well as various information and alarm
information.
The recorder is a subsidiary of the display, which is used for the user to print data.
The speaker provides the auditory alarm function.
The indicator provides additional information about the power supply, batteries, alarms and so
on.
The buttons and control knob are the input interface, which are used for the user to input the
information and commands to the patient monitor.
2.1.4 Power Supply
The power supply part is an important part of the patient monitor. It includes the main power
PCB, backlight board, batteries and fan.
The main power PCB converts the external AC current respectively to the 5V DC and 12V DC
current, which are supplied for the whole system. For the TFT display, there is a special
requirement on the power supply, so a backlight board is used. The batteries supply power for
the system for a short time when there is no external AC current. The fan is used for the heat
sink of the system.
2.1.5 Other Auxiliary Functions
The PM-7000 also provides the network upgrade function for the service engineers to
upgrade the system software without disassembling the enclosure.