Beckman Coulter LH 780 Instructions Manual page 146

TROUBLESHOOTING
CHECKING THE NEEDLE
5. Press one of the following:
MAIN MENU
SYSTEM RUN
RETURN
5.8 CHECKING THE NEEDLE
1. Cycle two samples:
One in Automatic aspiration mode (to check the sample flow to the BSV). While
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cycling the sample, blood passes through the BSV. Verify the presence of blood
sample in the WBC bath.
One in Manual aspiration mode (to check the sample flow from the BSV).
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2. If blood does not appear in the WBC bath, open the Diluter lower cover.
3. If necessary, uncrimp or replace tubing.
4. Visually check the needle.
5. If the needle appears bent, replace the needle.
5.9 CHECKING PINCH VALVES
You can activate solenoids to check pinch valve functions.
ROD
TRANSIT
CLIP
5-34
To display the Analyzer MAIN MENU screen.
To cycle samples.
To display the ANALYZER FUNCTIONS screen.
I-BEAM TUBING
1. Use a dental mirror to check tubing
alignment.
2. If the tubing is crimped, use a red transit
clip to hold the pinch valve open.
IMPORTANT Incorrect results can occur if you
pull tubing too far through the pinch valve and
cause it to restrict flow from its attached fitting.
Do not pull the tubing too far through the pinch
valve, and make sure to check the attached fittings
to ensure flow is not restricted.
Incorrect results can also occur if you fail to thread
the tubing properly. Make sure to properly thread
the I-Beam tubing in the front and rear of the pinch
valve.
3. Pull the tubing a short distance through
the pinch valve and squeeze it until the
pinched area releases.
4. Remove the red transit clip.
Note: No red transit clips should be present
on an operational system.
PN 773023AC