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6. If the PEEP safety valve is faulty, replace the expiratory valve assembly. After
replacement, you can use the similar method to check if the problem is fixed.
To diagnose the opening state of the PEEP valve:
1. Make sure that gas supplies are normal. In the [
Valves-Test Tool
] menu, set the PEEP
safety valve to ON.
2. With the increase of D/A value of the PEEP valve, the measured value of the PEEP
pressure sensor (or the anesthesia machine calibration device) should also rise. Note
that there is a non-response area for the PEEP valve when the D/A value is relatively
small. When the D/A value is less than this area, the PEEP valve cannot be opened and
the output is “0” continuously. When the D/A value is greater than this area, the
pressure output will increase with the increase of D/A value. This phenomenon also
exists for the inspiratory valve.
3. For subsequent diagnosis rules, refer to
5.4.3.4Problems Related to Opening State of
the Inspiratory Valve.
5.5 Hardware and Electrical Problems
Failure description
Possible cause
Recommended action
The AC power supply is
not connected properly
and the capacity of the
built-in battery is
insufficient.
Check and make sure that the AC
power supply is connected properly.
During the operation of the
anesthesia machine, the
display and AC indicator
lamp are extinguished all of
a sudden and the ventilator
cannot be started.
The fuse of the mains
inlet is damaged.
Replace the fuse. If the fuse is
burned repeatedly, it indicates that
the machine internal power is
short-circuited.
The fuse of the auxiliary
electrical outlet is
damaged.
Replace the fuse.
The auxiliary electrical outlet
has no output voltage.
The isolation transformer
is damaged.
Replace the isolation transformer.
During the operation of the
anesthesia machine, the
display is extinguished all of
a sudden and ventilation
remains normal.
The connection line of the
internal inverter gets
loose.
Properly insert the connection line of
the inverter.
When started up, the screen
is immediately lit and
dazzling. The screen
The power board software
is damaged.
1. Disconnect the AC power supply
and battery. Wait for 5 minutes to
cause the power board to fully
Summary of Contents for WATO EX-55
Page 1: ...WATO EX 55 65 Anesthesia Machine Service Manual ...
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Page 4: ...II FOR YOUR NOTES ...
Page 6: ...IV FOR YOUR NOTES ...
Page 12: ...6 FOR YOUR NOTES ...
Page 58: ...3 22 FOR YOUR NOTES ...
Page 242: ...6 54 6 4 1 Electrical Connections Electrical Circuit Diagram ...
Page 260: ...6 72 FOR YOUR NOTES ...
Page 261: ...7 1 7 Parts 7 1 Main Unit 7 1 1 Main Unit 7 1 1 1 Exploded View ...
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