EDAN iM80 Servise Manual - page 32
iM80 Patient Monitor Service Manual Principle Introduction
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6.1.3 SpO
2
Module
The SpO
2
module consists of two parts: sensor and measuring system. The measuring system
includes SpO
2
signals collecting, amplified simulating circuit system and relative digital/analog
converting, and signal processing systems.
The pulse extent of optical signal changes during monitoring. SpO
2
parameter, pulse rate signal
and pleth wave will be acquired after calculation. These data will be transmitted to the PC by
special communication protocol. Please refer to Patient Monitor User Manual for the SpO
2
specification.
6.1.4 Print Controlling Board
The print controlling board is in charge of receiving data from main board and driving the thermo
sensitive print head to print. Its structure block diagram is as follows:
Figure 6-2 Print controlling board principle block diagram
The iM80 printer module includes: microprocessor circuit, power switch and control,
communication interface, motor control part, recorder paper detecting circuit, time control for
printing power and heating, paper lacking temperature control and thermo sensitive head
protecting circuit.
6.1.5 Power Module
The power module is EDAN PS900Q. It outputs +5V, +12V and bus voltage (13V~19V) and
manages charging. It converts 220V AC power or battery power to 5V and 12V DC power, and
then supplies power to other boards. When AC power and battery power exist at the same time,
the system is powered by AC power which meanwhile charges the battery. When battery power is
used independently, the corresponding indicator lights on the front board of monitor.
PS900Q power module mainly consists of PS900Q power board, PS900Q power control board,
and PS900K DC output board.
Thermo
recorder
Main
board
CPU system
(RAM, ROM,
watchdog
logic control)
Motor
Monitoring
circuit