A7™ Service Manual 046-006272-00 5 - 79
Repair and Troubleshooting Hardware and Electrical Problems
5.5 Hardware and Electrical Problems
Failure description Possible cause Recommended action
When switch ON, AC and
battery indicator lamps are
not lit, the machine can not
ventilate and the screen is
not lit.
AC power supply is not
connected and the batty
capacity is insufficient.
Check and make sure that the AC power
supply is connected properly.
The breaker of AC input is
tripped and the battery capacity
is insufficient.
Reset the breaker. If the breaker is still
tripped when powered on after reset, it
indicates the machine inside is short-
circuited.
The fuse of power board is
burned and the battery capacity
is insufficient.
Replace the fuse. If the fuse is replaced,
the machine still can not be started up. It
indicates there exists internal shorting in
the machine.
The auxiliary AC electrical
outlet has no voltage
output.
The breaker of auxiliary outlet is
tripped.
If there is still no voltage output after the
breaker is reset, it indicates the auxiliary
A/C electrical outlet is shorted.
Anesthesia machine can
not be started.
The system switch is damaged. Replace the system switch.
The cable connected to system
switch falls off.
Check and make sure that the cable is
connected properly.
The power board hardware
circuit failure results in no power
output of 15.2V, 3.3V, 5V, and
12V.
Replace the power board.
The power board software code
error results in no power output
of 15.2V, 3.3V, 5V, and 12V.
Update the software.
The screen of anesthesia
machine can not be lit.
The cable connected to the
inverter falls off.
Check and make sure that the cable is
connected properly.
Screen Backlight Board is
damaged.
Replace the Screen Backlight Board.
The power board hardware
failure causes improper output.
Replace the power board.
The power board software
failure causes improper output.
Update the power board software.
The screen of anesthesia
machine can be lit, but
without any content.
The screen power supply fuse is
burned out, which results in no
3.3V output.
Replace the fuse.
The main control board failure
results in no display output.
Replace the main control board.
The screen of anesthesia
machine can be lit and
shows content, but the
screen flashes.
The failure of power board
causes power fluctuations
Replace the power board.
The time sequence of main
control board LVDS is abnormal.
Update the software of main control
board. If the screen persists flashing,
replace the main control board.
The heater is ineffective.
The heater driver and control
circuit of power board are
damaged.
Replace the power board.
The heater is damaged.
Replace the heater.
The internal sensor of heater is
ineffective.
The cable connected to heater
falls off.
Check and make sure that the cable is
connected properly.
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