Mindray A9 Service Manual

7-46
Message
Priority
Cause
Solution
sensor or NMT module.
TOF-Ratio Over
Range
Low
ST-Ratio measurement is
out of range.
1. Recalibrate the sensor.
2. If the alarm persists, replace the
sensor or NMT module.
DBS-Ratio Over
Range
Low
TOF-Ratio measurement
is out of range.
1. Recalibrate the sensor.
2. If the alarm persists, replace the
sensor or NMT module.
7.4 Typical Troubleshooting
7.4.1 Failure to Exit the Standby Mode
Failure
Description
Cause Confirmation
Confirmation
Result
Solution
Failure to exit
the standby
mode
1. Check whether the gas
supply is sufficient.
The gas supply
pressure is less
than 280 kPa (40
psi).
Connect or replace the gas
supply.
2. Use the touchscreen and
encoder for the main screen to
tap the Exit Standby softkey.
The system does
to respond to the
touchscreen
operation.
1. Upgrade the software.
2. If the problem persists,
replace the display (refer to
11.1.1).
The system does
to respond to the
encoder
operation.
1. Upgrade the software.
2. If the problem persists,
replace the encoder (refer to
11.1.1).
The system does
to respond to both
the touchscreen
and encoder
operations.
1. If other operations are
also unavailable, replace the
CPU board (refer to
11.1.1).
2. If other operations are
available, perform step 3 to
locate the cause.
3. Check whether the system
selftest succeeds.
The system
selftest fails.
Refer to 7.3.1.
4. Check whether a technical
alarm is generated.
A technical alarm
is generated.
Refer to 7.3.
7.4.2 Auto/Manual Switchover Failure
Failure
Description
Cause Confirmation Confirmation Result Solution
Failure to turn
the auto/manual
switch
Observe whether there is dirt
or debris in the gap of the
auto/manual switch.
There is dirt or debris.
Clean the
auto/manual switch.
There is no dirt or debris,
or the problem persists
after cleaning.
Replace the
auto/manual switch
(refer to 11.1.12).
Manual Only
displayed on the
screen
Check whether the system
selftest succeeds.
The system selftest fails. Refer to 7.3.1.
Check whether the leak test
succeeds.
The leak test fails. Refer to 4.2.3.
No response
after the
auto/manual
Check whether the gas supply
is sufficient.
The gas supply pressure is
less than 280 kPa.
Connect or replace
the gas supply.
Select Setup > Service >
The status of either or
Replace the

Mindray A9 Specifications

General

Brand	Mindray
Model	A9
Category	Medical Equipment
Language	English