| Pipet-Aid Model: | Problem | Solution |
| 4-000-110 & 220 | No aspiration | 1. Check valve placed in upside down, black o-ring goes up into the handle. |
| No aspiration | 1. Check valve in nosepiece needs to be cleaned out. Push wire or paperclip through black o-ring to open up check valve. When opened, rinse float and shell with water or alcohol. Allow to dry and reassemble.
2. Shake and listen for float to rattle. Reassemble into nosepiece and check for aspiration.
3. Tubing leading to vacuum side of pump has a hole in it. Cut out hole or replace tuging （4-000-004）
4. Hose connector missing or split. Replace hose connector （4-000-011） |
| Pipet leaks after filling | 1. Replace rubber insert （4-000-002）
2. Check tubing for holes, replace or shorten if found. Hose connector missing or split.
3. Replace hose connector（4-000-011）
4. Diaphragm inside pump is split or dried up and cracked, Replace diaphragms （4-000-010）. |
| Fill/empty very slow but no leaking | 1. Rubber insert has cotton plugs blocking flow, clean out cotton plugs or replace rubber insert （4-000-002）
2. Clean out check valve or replace （4-000-003）
3. Buttons in valve body dirty, clean or replace.
4. Diaphragm inside pump is split or dried up and cracked, Replace diaphragms （4-000-010）. |
| |
4-000-110-TC
& 220-TC | No aspiration | 1. Check valve placed in upside down, black o-ring goes up into the handle. |
| No aspiration | 1. Filter has been wetted. Replace with 4-000-051
2. TC gasket missing in nosepiece, requires one on each end of filter （4-000-057）.
3. Tubing leading to vacuum side of pump has a hole in it. Cut out hole or replace tuging （4-000-004） |
| Pipet leaks after filling | 1. Replace rubber insert （4-000-002）
2. Check tubing for holes, replace or shorten if found.
3. Hose connector missing or split. Replace hose connector （4-000-011）.
4. Diaphragm inside pump is split or dried up and cracked, Replace diaphragms （4-000-010）. |
| Aspiration/fill very slow but no leaking | 1. Rubber insert has cotton plugs blocking flow, clean out cotton plugs or replace rubber insert （4-000-002）
2. Buttons in valve body dirty, clean or replace.
3. Diaphragm inside pump is split or dried up and cracked, Replace diaphragms （4-000-010）.
4. Poor seal around filter; use Drummond filters （4-000-051）. |
| |
| 4-000-111 & 211 | No aspiration | 1. Check valve placed in upside down, black o-ring goes up into the handle. |
| No aspiration | 1. Check valve in nosepiece needs to be cleaned out. Push wire or paperclip through black o-ring to open up check valve. When opened, rinse float and shell with water or alcohol. Allow to dry and reassemble.
2. Shake and listen for float to rattle. Reassemble into nosepiece and check for aspiration.
3. Tubing leading to vacuum side of pump has a hole in it. Cut out hole or replace tuging （4-000-004）
4. Hose connector missing or split. Replace hose connector （4-000-011）
|
| Pipet leaks after filling | 1. Replace rubber insert （4-000-002）
2. Check tubing for holes, replace or shorten if found
3. Hose connector missing or split. Replace hose connector （4-000-011）
4. Diaphragm inside pump is split or dried up and cracked, Replace diaphragms （4-000-010）. |
| Aspiration/fill very slow but no leaking | 1. Rubber insert has cotton plugs blocking flow, clean out cotton plugs or replace rubber insert （4-000-002）
2. Clean out check valve or replace （4-000-003）
3. Buttons in valve body dirty, clean or replace.
4. Diaphragm inside pump is split or dried up and cracked, Replace diaphragms （4-000-010）. |
| |
4-000-111-TC
& 211-TC | No aspiration | 1. Check valve placed in upside down, black o-ring goes up into the handle. |
| No aspiration | 1. Filter has been wetted. Replace with 4-000-051
2. TC gasket missing in nosepiece, requires on on each end of filter （4-000-057）.
3. Tubing leading to vacuum side of pump has a hole in it. Cut out hole or replace tuging （4-000-004） |
| Pipet leaks after filling | 1. Replace rubber insert （4-000-002）
2. Check tubing for holes, replace or shorten if found.
3. Hose connector missing or split. Replace hose connector （4-000-011）
4. Diaphragm inside pump is split or dried up and cracked, Replace diaphragms （4-000-010）. |
| Aspiration/fill very slow but no leaking | 1. Rubber insert has cotton plugs blocking flow, clean out cotton plugs or replace rubber insert （4-000-002）
2. Buttons in valve body dirty, clean or replace.
3. Poor seal around filter; use Drummond filters （4-000-051）
4. Diaphragm inside pump is split or dried up and cracked, Replace diaphragms （4-000-010）.
5. Poor seal around filter; use Drummond filters （4-000-051） |
| |
| 4-000-100 & 200 | No aspiration | 1. Filter has been wetted. Replace with 4-000-051
2. TC gasket missing in nosepiece, requires on on each end of filter （4-000-057）. |
| No sound from motor when buttons depressed | 1. Battery needs to be charged overnight
2. Battery dead, replace with （4-000-035）
3. Listen for slight click when buttons are first pushed, if not heard, microswitch is broken, replace wire harness （4-000-046）. |
| Aspiration/fill very slow but no leaking | 1. Rubber insert has cotton plugs blocking flow, clean out cotton plugs or replace rubber insert （4-000-002）
2. Buttons in valve body dirty, clean or replace. |
| Aspiration slow | 1. Poor seal around filter; use Drummond filters （4-000-051）
2. Rubber insert has cotton plugs blocking flow, clean out cotton plugs or replace rubber insert （4-000-002） |
| Unit leaks | 1. Replace rubber insert （4-000-002）
2. Poor seal around filter; use Drummond filters （4-000-051）
3. Check nosepiece for tight fit, if loose, replace （4-000-053-A） |
| Buttons damaged | 1. Replace buttons （4-000-019）
2. Handle connector tubing has a pin hole in it, cut out if long enough or replace （4-000-013） |
| Aspiration is very slow; dispensing may be slow or normal. | Probable Cause: Liquid has been aspirated into the pump, which causes the flapper valve to stick and not function properly.
1. Open up the handle by removing the nosepiece and the three screws holding the handle halves together.
2. Take out the pump by disconnecting it from the tubing and the electrical connector.
3. Unscrew the four screws that hold down the two dark sections of the pump.
4. Remove the upper section from the next lower section. The upper section has the two ports extending from it. Once removed, this will expose a semi-transparent rubber flapper valve.
5. Gently remove this piece, clean it and the chamber with water. Dry both pieces & then replace the flapper valve.
6. This flapper valve can only be installed one way. Use the locating pins to align the valve. There is one large pin and one small pin to prevent misalignment and improper orientation of the valve.
7. Reassemble and reinstall. Check for aspiration speed.
To prevent this, the use of Drummond filters minimized the chance for damaging the valves but it may not always eliminate the problem. |
| |
| 4-000-101 & 201 | No aspiration | 1. Filter has been wetted. Replace with 4-000-051
2. TC gasket missing in nosepiece, requires on on each end of filter （4-000-057）.
3. "Fill" button between speed settings, Rotate to you feel it click into place. |
| No sound from motor when buttons depressed | 1. Battery needs to be charged overnight
2. Battery dead, replace with （4-000-035）
3. Battery damaged by use of non-Drummond charger. Replace battery （4-000-035） |
| Aspiration/fill very slow but no leaking | 1. Rubber insert has cotton plugs blocking flow, clean out cotton plugs or replace rubber insert （4-000-002）
2. Buttons in valve body dirty, clean or replace. |
| Unit leaks | 1. Replace rubber insert （4-000-002）
2. Poor seal around filter; use Drummond filters （4-000-051）
3. Valve body o-rings need to be replaced. Call Drummond 1- |
| Aspiration is very slow; dispensing may be slow or normal. | Probable Cause: Liquid has been aspirated into the pump, which causes the flapper valve to stick and not function properly.
1. Open up the handle by removing the nosepiece and the three screws holding the handle halves together.
2. Take out the pump by disconnecting it from the tubing and the electrical connector.
3. Unscrew the four screws that hold down the two dark sections of the pump.
4. Remove the upper section from the next lower section. The upper section has the two ports extending from it. Once removed, this will expose a semi-transparent rubber flapper valve.
5. Gently remove this piece, clean it and the chamber with water. Dry both pieces & then replace the flapper valve.
6. This flapper valve can only be installed one way. Use the locating pins to align the valve. There is one large pin and one small pin to prevent misalignment and improper orientation of the valve.
7. Reassemble and reinstall. Check for aspiration speed.
To prevent this, the use of Drummond filters minimized the chance for damaging the valves but it may not always eliminate the problem. |
| |
| 4-000-105 | No aspiration | 1. Filter has been wetted. Replace with 4-000-051
2. TC gasket missing in nosepiece, requires on on each end of filter （4-000-057）.
3. "Fill" button between speed settings, Rotate to you feel it click into place. |
| No sound from motor when buttons depressed | 1. Plug in power supply/charger and use unit while it charges, use only power supply/charger 4-000-065. If battery will not hold a charger replace with new battery,（4-000-036） NOTE: Not the same battery as in the other portable units.
|
| Aspiration/fill very slow but no leaking | 1. Rubber insert has cotton plugs blocking flow, clean out cotton plugs or replace rubber insert （4-000-002）
2. Buttons in valve body dirty, clean or replace. |
| Unit leaks | 1. Replace rubber insert （4-000-002）
2. Poor seal around filter; use Drummond filters （4-000-051
3. Valve body o-rings need to be replaced. Call Drummond 1- |
| |
| 4-000-300 & 302 & 303 | No aspiration | 1. Filter has been wetted. Replace with 4-000-051
2. TC gasket missing in nosepiece, requires on on each end of filter （4-000-057）.
3. "Fill" button between speed settings, Rotate to you feel it click into place. |
| Unit leaks | 1. Replace rubber insert （4-000-002）
2. Poor seal around filter; use Drummond filters （4-000-051）
3. Valve body o-rings need to be replaced. Call Drummond 1- |
| No sound when handle removed from cradle | 1. Actuator button is stuck in the down position. |
| Aspiration/fill very slow but no leaking | 1. Rubber insert has cotton plugs blocking flow, clean out cotton plugs or replace rubber insert （4-000-002）
2. Buttons in valve body dirty, clean or replace. |
| |
| 4-000-400 & 400-C | Unit will not turn "on" | 1. Hold menu button down until it flashes and turns on.
2. Unit not plugged into the power supply
3. On portable unit using batteries, the battery is not charged. |
| Aliquot inaccurate | 1. Confirm you have the correct pipet settings （volume and brand）
2. Confirm you are using the correct filters, part number 4-000-051-E （essential for accuracy） |
| Programmed aliquot is inaccurate | 1. Perform CAL. Scroll to OPTNS, press menu; cursor will be on CAL, press menu; scroll to YES, press menu; remove any pipets, press menu. |
| Programmed aliquot is inaccurate but consistant | 1. Scroll to OPTNS, press menu; scroll to OFST, press menu; scroll to YES, press menu; if aliquot is too small, lower OFST value and check/if aliquot is too large, increase OFST value and check. |
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