Advertisement
Liquid Crystal Display (LCD)
The LCD is a custom segmented glass panel which provides functional
information to the user. The LCD is attached to the display PCB via "zebra"
strips and "zebra" retainers. Zebra strips are soft, compressible foam strips
which provide electrical contact between the display PCB and LCD contact
pads. The zebra retainer provides that mechanical support to. compress the
zebra strips between the display PCB and LCD.
Note:
There are two versions of the LCD.
Early versions of the
membrane switch had gridlines screened onto the viewing area,
and were used with an LCD that did not have gridlines.
The current membrane switch does not have gridlines screened
onto the viewing area. This membrane switch is designed for
use with an LCD which has gridlines screened onto the viewing
area.
Gridlines provide distinct separation between the 6 sections of
the LCD.
If you need to replace an early version of the
membrane switch, you will need to replace the LCD to ensure
that gridlines are visible to the user.
Testing the Liquid Crystal
Visuaily inspect the LCD for damage.
If the LCD is cracked or physically
Display (LCD)
broken, it must be replaced.
If it is suspected that.a segment or status indicator is not being displayed
properly, it will be necessary to determine if the problem is the LCD, or
another component of the Monitor.
See the Troubleshooting section (starting
on page 13) for details.
Procedure
1.
Tum the Monitor off. Open the rear control panel door and set the TEST
SWITCH to the T, position. Close the rear control panel door.
Note:
H you have installed a CritiCore Communications Module, your
TEST SWITCH label has been replaced by a
COMMUNICATIONS MODULE label...
For purposes of this test, the display will be broken up into two main
categories:
Segment groups and status indicators:
:
Segment groups will refer to the seven groups of numeric. indicators for-
Present Interval Output, Bladder Temperature, Time, interval Lengih...
Prior Output interval Ending Time, Prior Output Volume and Flow. Rate!
Container Volume.
Status Indicators will refer to all of the remaining indicators; Set Value,
Check Container, Low Battery, AM and PMindicators, MLU/HR indicator,
alarm bell icon, etc.
2.
Turn the Monitor on while observing the display: "The Monitor will first
complete a self test cycle lasting approximately 4-seconds. During this
test all of the segment groups and status indicators will be lit, and the
display should resemble Figure 28.
:
—
Dauer
Figure 28
Bard CritiCore Monitor Service Manual
Page 29
Advertisement
