Vetscan HM5 Repair Guide

Table of Contents
Repair Guide ........................................................................................................................................ 2
Removing/Cleaning the Wash Head .................................................................................................. 2
Replacing the Peristaltic Pump Tube Assembly ................................................................................. 2
Replacing the Battery – White Models Only ...................................................................................... 3
When to Change the battery ................................................................................................................. 3
Items needed......................................................................................................................................... 3
Procedure .............................................................................................................................................. 3
Replacing the Measuring Aperture.................................................................................................... 4
Items Needed ........................................................................................................................................ 4
Procedure .............................................................................................................................................. 4
Replacing the Syringes ...................................................................................................................... 7
When to Replace the Syringes (Dilutors)............................................................................................... 7
Procedure .............................................................................................................................................. 7
Replacing the Needle ........................................................................................................................ 9
When to Replace the Needle ................................................................................................................ 9
Procedure .............................................................................................................................................. 9
Replacing the Dilution Chamber & HGB Head.................................................................................. 14
When to Replace the Dilution Chamber.............................................................................................. 14
When to Replace the HGB Head.......................................................................................................... 14
Procedure ............................................................................................................................................ 14
Replacing the Built-in Printer .......................................................................................................... 18
When to Replace the Built-Printer ...................................................................................................... 18
Procedure ............................................................................................................................................ 18

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 Repair Guide
This repair guide contains description on how to replace vital hardware pieces within the HM
hematology analyzer to reduce errors.

Removing/Cleaning the Wash Head

Cleaning the wash head periodically can help prevent salt from gathering on the wash head and causing
high blank values. The wash head can be removed and cleaned when troubleshooting high blanks or
flags indicating a dirty analyzer. The wash head can also be replaced when needed.

Procedure: Removing/Cleaning the Wash Head

Replacing the Peristaltic Pump Tube Assembly

After extended, long-term use, the peristaltic pump tube may eventually need to be replaced. The pump
tube may also need to be replaced if a clot is stuck inside the tube (Pressure Error), cracked, or
damaged.

How to replace the peristaltic pump can be found:

Newer Grey Pump Fixture Older Yellow Pump Fixture

HM5c New Pump (New Grey Pump Fixture)

HM5/HM2/HM2b/HMII Pump (Old Yellow Pump Fixture)

If a unit was serviced in repair recently, they will have the newer grey pump fixture. If a unit has not
been sent into repair at Abaxis in the past 2 years, then the unit will have the older yellow pump fixture.
All HM5c model have the newer grey pump fixture.

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 Replacing the Battery – White Models Only

When to Change the battery

• Self-Test Fail for Power Battery on white HM models
• Error message that says “Battery Voltage too Low” after a reboot

Items needed
• CR2032 (3V) battery
• 2.5mm Allen wrench

Procedure
1) Unplug the white/cream colored hematology unit. The unit needs to be completely off before starting.
2) Turn the unit around, and unscrew the 5 screws holding the main chassis in the back with a 2.5 mm Allen
wrench.

3) Pull the cover back about ½ an inch so that it’s no longer hooked under the face place. This will then lest
you pull the bottom of the chassis back enough to be able to access the battery.

4) Swap the battery, swing the cover back to its original position under the face place and put the 5 screws
back in. Then plug the analyzer back in and turn it on.

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 Replacing the Measuring Aperture
A measuring aperture should be replaced when you are unable to remove visible clots seen inside the
dilution chamber, persistently high blanks where cleanings do not help, and abnormal runs with 9,999
values for either the RBC or PLT on blanks or sample runs.

Items Needed
• Measuring Tube
• Reference Electrode

Procedure
1) Make sure the measuring tube and reference electrode are pressed tightly together, and that
the indentations on the side of the aperture is lined up properly so that the U-shaped metal clip
can slide on.
2) Make sure to drain the chamber before replacing the aperture, simply go to “Maintenance” >
“Cleaning” > “Drain Chamber”.
3) Open the side door of the analyzer.

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 4) Disconnect the grounding wire (black wire).

5) Disconnect the tube in front of the aperture (the other end of this tube is connected to valve 4).
Disconnect the tube on top of the aperture (the other end of this tube is connected to valve 2).

6) Remove the measuring aperture from the dilution chamber. Twisting the aperture can help
loosen it, making it easier to remove. You do not have to be gentle when removing the aperture.

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 7) Remove the U-Shaped metal clip then the old aperture. Push the U-Shaped metal clip into the
gooves of the new aperture. The U-shaped clip should fit into the indentations on the side of the
aperture, if it does not, you may have to twist the aperture and reposition the indentations so
that the clip can fit.

8) Push the new aperture into the dilution chamber, you may need to twist the aperture so that it
can be seated properly.

9) Attach the front tube (connected to valve 4) and top tube (connected to valve2) to the newly
replaced aperture, and reconnect the grounding wire.
10) Run a blank.

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 Replacing the Syringes

When to Replace the Syringes (Dilutors)

• Visible salt buildup and corrosion found on the syringes
• Signs of leaking or damaged to the syringes

Procedure
1) Turn off the unit, and unplug the power cord. The unit needs to be completely off before you
start.
2) Turn the analyzer around and open the back door to inspect the syringes. Make sure that all
syringes are pushed upward.
3) Unscrew the two top screws by hand. If the screws are stiff, use a hemostat to loosen the
screws.

4) Lift the bracket by pulling on the middle post. If the bracket is stiff, use a flat head screwdriver
to loosen it.
5) Select the syringe that needs to be replaced. The color and order of the syringe is important,
only the Lyse2 syringe can be replaced with a black syringe and must be placed 2nd to the left.
Unscrew the bottom screw on the syringe. If stiff, use a hemostat to loosen the screw.

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 6) Disconnect the tube above the selected syringe and slide the syringe out.
7) Replace with a new syringe, but be careful to insert side B (larger circle) of the syringe into the
post first. Side A (smaller circle) should be facing towards the front.

SIDE A (Smaller Circle) SIDE B (Larger Circle)

SIDE B

8) Tighten the screw on the bottom of the syringe and re-attach the tube above the syringe. Fasten
the bracket back in place, and re-tighten the top screws. Manually slide the syringes up and
down to make sure that everything was properly seated. After, push all syringes upward and
close the back door.

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 Replacing the Needle

When to Replace the Needle

• Clogging Errors
• Pneumatic MVert/MHori Errors
• Visible salt buildup or corrosion found on the needle

Procedure
5) Turn the analyzer around, unplug the unit, and unscrew the 5 screws holding the main chassis in
the back with a 2.5 mm Allen wrench.

6) Pull the cover back and remove the panel, make sure to disconnect the built-in printer cable up
top. Pull on the tab on each side of the printer, and disconnect the ribbon.

7) Open the side door, and remove the screw on the side of the panel with a 2mm Allen wrench.
Go to the other side of the unit, and remove the screw on the other side of the panel.

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 8) Tilt the unit backward, you may want to place something behind the unit to hold it in a tilted
position. To remove the front panel, unscrew the two front screws on the bottom of the unit
with a 2.5mm Allen wrench. After, lift the front chassis out.

9) Slide the needle to the left, and only disconnect the tube from the needle to the metal post. If
the tube is hard to disconnect, use a flat head screwdriver to loosen it.
10) Use a 2mm Allen wrench to loosen the screws a tiny bit on the needle, do not remove the
screws.

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 11) From the top, slide the needle out of the XY assembly and slide in the replacement needle.
Make sure that the replacement needle can slide through the wash head. After, re-attach the
tube from the needle to the post.

12) Position the needle, make sure the needle is NOT turned 90° or 15°; it should position at 45°.
Tighten the screws on the needle just a little bit to hold the needle in position.

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 13) Align the needle with the wash head, the needle should be flushed and should not be visibly
seen under the wash head. Place a finger under the wash head to align the needle, and tighten
the screws to hold the needle in place.

14) Turn the unit on, and get to the service menu:
HM5c (Blue): Touch “Exit” > “Log Out Admin” > “Log In”. Press the four corners in the listed
order below, and type in the password: 8149 when the login name defaults to Service. After, go
to “Maintenance” > “Diagnostics” > “Service”.
HM5 (White): Press the “Bolt (Utilities)” icon > “6- Service”. Type in the password: 8149.

1 4

2 3

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 15) Test the needle positioning (Vertically):
HM5c: Select “Troubleshooting” > “Motors” > “Needle”
HM5: Select “5-Testing” > “2-Motor” > “2-Vert”

Watch the needle carefully to make sure that there is no issue

when the needle is moving up and down, through the wash
head. The needle should not touch the bottom of sample door.
Adjust the needle if needed.

16) Test the needle positioning (Horizontally):

HM5c: Select “Troubleshooting” > “Motors” > “Horizontal”
HM5: Select “5-Testing” > “2-Motor” > “3-Horizontal”

Watch the needle carefully to make sure that there is no issue with the needle sliding left to
right.

17) Test the needle alignment:

HM5c: Select “Needle Settings” under the service menu
HM5: Select “6-Miscellaneous” > “5-Needle Settings”

Inspect the needle to make sure that you cannot visibly see the needle protruding below the
wash head from a side view. If you place a finger under the wash head, you should be able to
feel the needle flushed on the wash head. Adjust the needle until you achieve this by loosening
the screws, re-aligning the needle, tightening the screws, and running the needle settings test.

18) Once you are confident that the needle has been replaced successfully, re-attach the front
panel. Make sure to that the front panel lines up with the sample door.

19) Test the sample door:

HM5c: Select “Troubleshooting” > “Motors” > “Sample rotor”
HM5: Select “5-Testing” > “2-Motor” > “7-Samp”

The sample door should rotate without any errors. Adjust the
front panel if needed.

Tighten the bottom screws on the front panel with a 2.5mm

Allen wrench, and the screw on both side of the panel with a
2mm Allen wrench. After, close the side door.

20) Reattach the top panel to its original position, make sure to connect the built-in printer cable
and put the 5 screws back in using the 2.5mm Allen wrench. After, plug the analyzer back in and
turn it on.

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 Replacing the Dilution Chamber & HGB Head

When to Replace the Dilution Chamber

• Clogging Errors: C c Q flags and visible clots
• Unable to drain fluids out of the dilution chamber

When to Replace the HGB Head

• Self-Test Failed
• Constant H-Flag

Procedure
1) While the unit is turned on, go to “Maintenance” > “Cleaning” > “Drain Chamber”. Open the
side door, and make sure that the dilution chamber is fully drained. If not, drain the chamber
again. Turn off the analyzer afterwards.
2) Disconnect the grounding wire and all tubes attached to the dilution chamber and aperture (use
a flat head screw driver if the tubes are too hard to remove). Front tube on the aperture is
connected to Valve 4; top tube is connected to Valve 2, and Y tube on the chamber is connected
to the valves all the way in the back of unit.
3) Remove the measuring aperture. Refer to “how to replace the aperture” if needed.

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 4) Unscrew the connection point that holds the metal bracket to the white clip that holds the “S-
loop” tube using a 2.5mm Allen wrench.

5) Unscrew the Teflon screws on both sides of the chamber using a screwdriver. The Teflon screws
are sensitive; do not apply a lot of force.
6) Pull the dilution chamber out of the two metal posts.

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 7) Turn the chamber to the right side, and unscrew the connection point that holds the HGB head
to the metal fixture.
8) Once the metal fixture is removed from the dilution chamber, slide the HGB head out of the
chamber, and replace what is needed either the HGB Head or Dilution Chamber.

Metal Fixture

HGB Head

Dilution Chamber

9) After, slide the HGB head back into the dilution chamber. Re-seat the metal fixture, and screw
the bolt, washer, and star washer into the connection point with a 2.5 mm Allen wrench.

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 10) Slide the dilution chamber back into the metal posts back inside the unit. Re-screw the Teflon
screws on the chamber. After, re-attach the tube on the bottom of the dilution chamber.

11) Using both hands, re-attach the metal bracket to the bottom of the chamber and the plastic clip
to the amplifier board. Make sure the tube forms an “S-Loop”. This will take a couple of
attempts. You can disconnect and reconnect the tube under the chamber to make sure the “S-
Loop” was formed properly.

12) Re-attach the measuring aperture and make sure that it is pushed all the way into the chamber
and the fit is nice and snug.
13) It is best to cut of ½ cm of all tubes connected to the aperture and chamber for a tighter seal.
After, re-connect the front tube and top tube on the aperture, and the Y-tube on the chamber.
14) Re-attach the grounding wire to the aperture.

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 Replacing the Built-in Printer

When to Replace the Built-Printer

• Printer printing faintly after replacing multiple new paper rolls
• Paper is not feeding through the printer properly
• Blue printer light keeps blinking non-stop

Procedure
1) Turn the analyzer around, unplug the power cord, and unscrew the 5 screws holding the main
chassis in the back of the unit with a 2.5 mm Allen wrench.

2) Pull the cover back and remove the side panel. Pull on the tab on each side of the printer, next
to the ribbon and disconnect the ribbon connected to the printer.

3) Lift the side panel, and place panel so that built-in printer is laying on a flat surface.

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 4) Located the tabs on the both side of the printer. Pull on the tab circled below towards you, and
push the tab upward. Repeat this on the other side. By doing so, you will release the built-in
printer.

5) Slide the printer out of the chassis, and replace the printer with a new printer.
6) Slide the tabs on both sides of the printer to lock the printer into position.
7) Place the side panel back on the unit, re-attach the ribbon to the printer and screw the panel
back into place.

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