3
M
AINTENANCE
&
T
ROUBLESHOOTING
3.1
Setting the LCD Contrast
The
YELLOW JACKET 68940
features an adjustable LCD contrast for use in varying light
conditions. To adju
st the contrast, press the ‘SET’ button which appears after the unit is
powered on. The screen will display several options as shown in
(Figure 27)
. Pressing the
‘SET’ button will display the options in
(Figure 28)
.
Press ‘DOWN’ or ‘UP’ to adjust the LCD
contrast. Press ‘SAVE’ to save your settings and return the
(Figure 27)
.
3.2
Changing the White Plastic Sample Filter
When inspecting the sample filter, look completely around the entire outside diameter of the
white filter element located inside of the clear plastic housing. Look for red spots or the
beginnings of discoloration on the white outside diameter of the element.
DO NOT
look into
the round ends of the white element for red spots or discoloration. The round ends of the filter
may always appear red. If red spots or discolorations are discovered on the outside diameter,
the sample filter requires replacement to prevent the influx of particulate and oil mists into the
instrument.
To change the Sample Filter, first obtain a replacement filter. Remove the existing filter from
the retaining clip of the instrument by pulling straight up and out.
CAREFULLY
remove the
flexible, black rubber tubing connections from both ends of the existing filter.
DO NOT
allow
the tubes to slip back into the internal portion of the case. Discard the existing filter in an
environmentally friendly manner.
Install the tube ends onto the barbs of the replacement filter, taking note to align the flow arrow
of the filter with the flow arrow on the analyzers top panel.
CAREFULLY
slide the tubing back
into the internal portion of the instrument and seat the new filter into the retaining clip. Inspect
your hose assemblies for signs of oil entrapment. Replacement of the Sample Filter usually
requires replacement of the Brass Sample Hose Restrictor Assembly.
20
Figure 27
Figure 28
TO FEED A
NEW PAPER ROLL
PRESS FEED
PRESS SET TO
ADJ LCD CONTRAST
BACK
FEED SET
ADJUST CONTRAST
CURRENT VALUE
40
DEFAULT VALUE
40
DOWN
UP SAVE
Summary of Contents for 68940
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