Datex-Ohmeda Aestiva 7900 SmartVent, Service Manual

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4/Tests and Troubleshooting
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Alarm
Message/Symptom
Condition/Probable Cause Service Action
Memory (EEPROM) Fail-
ure 1. If EEPROM or CPU board was
replaced, reboot the ventilator
2. Read/write failure, CRC failure
3. Default values will be used at
power up
Reboot ventilator, if problem con-
tinues replace CPU board
Memory (flash) Failure
Minimum System Shut-
down
CRC failure. Monitoring is not
functioning or it is unreliable Reboot ventilator, if problem con-
tinues replace CPU board
Memory (RAM) Failure
Minimum System Shut-
down
Walking pattern test failure.
Monitoring is not functioning or it
is unreliable Reboot ventilator, if problem con-
tinues replace CPU board
Memory (video) Failure
Minimum System Shut-
down
Redundant storage test failure.
Monitoring is not functioning or it
is unreliable Reboot ventilator, if problem con-
tinues replace CPU board
Auxiliary gas outlet DCGO switch is in auxiliary posi-
tion and language is not French Check switch and language set-
tings
No Battery Battery voltage less than 7 V
while running on machine elect
power 1. Check inline batt fuse
2. Measure batt volts 12.5 but
<16V
3. Replace battery
Low Battery Charge Voltage less than 12.5V while
running on machine elect power 1. This message should disappear
after charging for 12 hours.
2. Measure batt volts 12.5 but
<16V.
3. If not the battery may be defec-
tive and need replacement
Low Battery Minimum Sys-
tem Monitoring Battery voltage less than
11.35V while running on battery 1. Charge battery.
2. Measure batt volts 12.5 but
<16V. If error message doesn't
clear, replace battery
System Shutdown Mini-
mum System Shutdown Battery voltage less than 10.9V
while running on battery 1. Charge battery.
2. If error message doesn't clear,
replace battery
Battery Voltage out of
range
Battery current out of
range
Battery Voltage > 16V
Battery current > 4 amps
System is unable to run on
backup batt.
1. Reboot ventilator, if problem
continues replace PSB board
2. Replace the CPU board