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Caution:
Panel seal strips should meet flush in the corners with no
overlapping.
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г
№
Note:
Ensure that there is no lint or foreign matter on the LCD or on
the membrane switch before proceeding with the installation.
4.
Install ihe display PCB/LCD assembly to the bezel top ensuring
alignment of temperature jack, by installing the four (4) 4-40x1/4" Phillips
pan-head screws.
5.
Reconnect the membrane switch mylar connector to the display PCB
(see Figure 21).
6.
Install the bezel enclosure per the Installing the Bezel Enclosure
procedure on page 21.
7.
Perform the Functional Checkout procedure (see page 7) to ensure that
ali display and general CritiCore Monitor functions:are working property.
Figure
Display PCB
The display PCB (Printed Circuit Board) provides the transfer: of data
between the user and the main PCB. The display PCB is directly attached to
the bezel top, and is connected to the main PCB with the display cable.
The display PCB contains ihe LCD driver electronics and provides the
electrical and mechanical connections with the LCD.
The display PCB also contains a temperature jack and a phototransistor:
The temperature jack provides an insertion site for a temperature probe
utilizing a mono phone plug. The Monitor is designed convert the resistance
of a 400-Series thermistor into the appropriate relative temperature reading.
The phototransistor contains an IR emitting diode and IR photodetector. The
diode and detector are designed to detect the cap on the disposable
collection container.
Testing the Display PCB
Procedure
Electronics
1.
Perform the Functional: Checkout procedure to verify the suspect
function of the display PCB.
Refer to the following tests to isolate the
problem(s) to the display PCB.
*
Testing the Phototransistor (page 55)
+
Testing the Temperature Jack (page 27)
*
Testing the Liquid Crystal Display (LCD) (page 30)
Temperature Jack
The temperature jack connector is available as a replacement part. Follow.
the procedures below to test, remove, and install the temperature jack
connecior.
了
ゝ
Note:
Before you test the temperature jack, perform the Testing the
:
jj
LCD procedure (on page 30) to verify that all LCD status
~
indicators are functioning properly.
Figure 22
Page 26
Bard CritiCore Monitor Service Manual
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