Philips Avalon FM20, Service Manual

Page: 97 / 260

7 Testing and Maintenance
97
Disabling/Enabling Touch Operation
To disable touchscreen operation of the monitor, press and hold the
Main Screen
key for about three
seconds. A red padlock will blink on the key. Press and hold the
Main Screen
key again for about three
seconds to re-enable touchscreen operation.
Checking the Fetal Recorder Offset
To check the recorder offset:
1 Connect a Toco transducer to the monitor.
2
Place the Toco transducer on a flat surface so that it is resting on the belt button, and is therefore
not under any load.
3
Start the recorder, and press the
PaperAdvance
key three times to make sure that at least three
pages of paper have advanced.
4
If the Toco trace is recording exactly on the 20 unit gridline, then the offset is correctly set.
5
If the Toco trace is not recording exactly on the 20 unit gridline, then set the offset as described in
“Setting the Fetal Recorder Offset” on page 97.
Setting the Fetal Recorder Offset
To set the fetal recorder offset, you first need to run the fetal recorder calibration:
1
Enter Service Mode.
2
In
Main Setup
, select
Fetal Recorder
to enter the
Fetal Recorder
menu.
The current setting for the recorder offset is shown (but it is still grayed out, and you cannot select
it yet).
3
Select
Calibration
to start the recorder calibration printout.
4
The recorder stops, and the
Cal. Offset
becomes selectable.
5
Look at the section of the printout entitled "Calibration".
You will see the numbers 0 to 10, and each number has a line printed below it. See for which
number the line best fits the 20 unit gridline (8 in this example).
6
Select
Cal. Offset
, and select the offset value from 0 to 10 from the list, as determined in step 4.
7
The recorder then finishes the calibration printout. Confirm that the line prints on the 20 unit
gridline.