Discussion Category: Centrifuge
L-80XP DIAG 61 Drive Malfunction
I use a Beckman Optima L-80XP.
Few days ago, after centrifuging for about an hour using the normal procedure,
I waited for the rotor to stop before releasing the vacuum, and the moment I opened the door, the power suddenly down. When I turn the power back on, "CPU Board Malfunction" is displayed once, and then "DIAG 61, Drive Malfunction" continues to be displayed.
There is also a problem where the vacuum pump is force to start immediately after the power is turned on, regardless of whether the door is open or close.
In the past, when a persistent error occurred, a Beckman engineer taught me a trick to overwrite the error by shaking the rotor by hand, but this time that strategy did not work.
The engineer once repaired it by replacing something like the ROM on the board, but he has now retired.
The lab director doesn't want to pay the cost to fix this.
Does anyone know how to deal with this problem?
Reply bydpkleessr
A "D61" diagnostic indicates that there is a problem with the tachometer frequency. In many cases this problem could be due to the spacing of the Tach pickoff has changed somehow possible by placing the rotor on the spindle a little too hard which may have slightly pushed the pickoff down a little bit but enough to cause the problem that you are seeing. The other possibility is that the underside of the drive spindle is contaminated with vacuum or diffusion pump oil. The best way to deal with that is to wet a paper towel with 95% ethanol and then push the wet edge up underneath the drive spindle while turning the spindle a few times. I recommend that you then do the same thing with a dry paper towel and then repeat with the wet and dry again. Hope this helps.
Don
Reply bykyuma
Thanks Don, When cleaning the spindle removed a little bit of black dirt, but it didn't solve the problem.
As soon as the power is turned on, the vacuum pump starts with an error sound and does not stop when the "vacuum" button is pressed, and DIAG61 keeps appearing.
Reply bykyuma
There were four old RAMs (DS1225AB) left behind by an engineer who had repaired them in the past, so I thought it was a bad bet, but I thought it was a bad bet, but the one on the bottom of the two CPU boards was I tried replacing the RAM.
Then, the vacuum pump could be controlled, and the error changed to "DIAG62 Drive malfunction". Temperature is also now accurately measured and controlled.
Even if I try to turn the rotor by hand or move my hand in front of the optical sensor at the bottom of the spindle, the display remains at 0 rpm and does not change. This never happened before. Is it a problem with the tacho sensor or the circuit that reads the tacho sensor signal?
Reply bytrong.ha
i have the same problem with all of the above. after replacing the CPU board from a spare unit fixed all the error except there is no "RPM" reading. field service came in and redo calibration and the fixed the problem. unit is put back to work.