9 Anesthetic Gas Module Repairing the Anesthetic Gas Module
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the head to the main PC board is defective. In this case you must replace the head or the cable
or both.
NOTE When installing a new measurement head and using the default NVRAM data, a flow rate calibration
must be performed because no flow rates will be transferred. If no flow rate calibration is performed, a
problem with the pneumatic system will be flagged during Anesthetic Gas Module operation.
– If the LED blinks alternately red and green, a problem occurred reading the new analyzer head.
Turn off the power and check all connections. Make sure the ribbon cables are not broken and
correctly seated. Repeat the procedure staring with step 6.
If the LED is still blinking red and green you need to check whether the failed NVRAM transfer is
due to a defective NTB and/or cable connection:
a. Replace the old measurement head with the new one.
b. Repeat the NVRAM transfer procedure from step 6.
If the LED is solid red, the new measurement head is defective. In this case you must use a new
replacement measurement head and return to step 4. If the LED blinks alternately green and red,
the NTB and/or the attached cables are defective. In this case you need to use a new NTB, or
you can install the new measurement head with the default NVRAM data.
8 Once the LED is on green, you can begin the NVRAM transfer process by pressing the momentary
push button switch on the NTB. The LED will change to amber for about 5 seconds, followed by
solid green indicating a good transfer of NVRAM data.
If you observe a blinking red LED, no transfer or a bad transfer of NVRAM data occurred. Proceed
with the installation of the new measurement head regardless. The NVRAM transfer will not be
possible, but the replacement head has default information for pump hours and no serial number.
However, a flow rate calibration must be performed because no flow rates will be transferred. If no
flow rate calibration is performed, a problem with the pneumatic system will be flagged during
Anesthetic Gas Module operation.
9 If step 8 was successful, the Anesthetic Gas Module can now be powered off. The NTB can be
disconnected and the old measurement head removed and replaced with the new head (see removal
and replacement procedure below).
10 Reconnect the Anesthetic Gas Module to the monitor.
NOTE When returning the defective measurement head for repair, make sure to return the NVRAM transfer
board with the head.
Instructions for the transfer procedure are also included with the NTB.
Removal
To remove the IR measurement assembly head (refer to Figure 60 and Figure 61):
1 Remove the flat-cable (1) connector from the main PC board.
2 Remove the pneumatic connections (2) from the sample cell, which are located on top of the IR
measurement assembly head.
3 Remove the pressure transducer connection (3) located on the side of the IR measurement
assembly head.
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