Author Topic: System maintenance/fix-it tips and tricks  (Read 866 times)

DavidAdams

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System maintenance/fix-it tips and tricks
« on: March 18, 2020, 04:17:08 pm »
In light of current world events I would like to propose a sticky forum topic where we all can share our knowledge of problems we've encountered with our various instruments and solutions/fixes that we have come up with on our own or have been provided by the manufacturer. I think that we all have a lot of experience with instrument issues and hold a vast amount of knowledge, collectively, in our heads about we ultimately fixed whatever was ailing us and our machines.
David Adams
The University of Auckland
Faculty of Science | School of Environment

John Donovan

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Re: System maintenance/fix-it tips and tricks
« Reply #1 on: March 18, 2020, 04:46:19 pm »
This topic is now "sticky".  Please feel free to share your collective JEOL tips and tricks!
John J. Donovan, Pres. 
(541) 343-3400

"Not Absolutely Certain, Yet Reliable"

jeolunlv12

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Re: System maintenance/fix-it tips and tricks
« Reply #2 on: May 09, 2020, 05:40:03 pm »
Hi David and JEOL users,

My jxa8900 shut down yesterday.

The N2 is 80 psi and chill water looks normal, all fuses are good. I turned off "consul electronics" and tried to turn on the main switch, there is no response from mechanic pump, only hear the fan turns. The main switch went back to off position after releasing it (usually it would be at on position if the pump starts).

Any suggestions what might be wrong?

Minghua


DavidAdams

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Re: System maintenance/fix-it tips and tricks
« Reply #3 on: May 10, 2020, 01:12:25 pm »
Hi Minghua,

That seems to me like you might have something seized in your roughing pump. If the motor on one of the other components is seized then the pump will overload the circuit and it will trip the mains breaker.

I had the main motor on the 8900 at the USGS in Denver go out in November. The service engineer came out and replaced the pump motor and it started working just fine again.

I hope this helps!
Dave
David Adams
The University of Auckland
Faculty of Science | School of Environment

jeolunlv12

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Re: System maintenance/fix-it tips and tricks
« Reply #4 on: May 11, 2020, 11:30:39 am »
Dave, thank you.

DavidAdams

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Re: System maintenance/fix-it tips and tricks
« Reply #5 on: July 09, 2020, 01:32:53 pm »
I'm currently experiencing a problem with my PCD. Apparently is stuck in the closed position. I've adjusted the nitrogen pressure as per the service engineer's recommendations but that hasn't fixed anything.

Because of the COVID border restrictions in NZ I can't get a service engineer into the country to do anything about it and I have a probe that's suddenly become a very expensive, very heavy paperweight.

Does anyone have any tips, tricks, and/or suggestions as to how I can unstick my PCD?

Thanks!
David
David Adams
The University of Auckland
Faculty of Science | School of Environment

D.

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Re: System maintenance/fix-it tips and tricks
« Reply #6 on: July 17, 2020, 02:03:06 am »
I'm currently experiencing a problem with my PCD. Apparently is stuck in the closed position. I've adjusted the nitrogen pressure as per the service engineer's recommendations but that hasn't fixed anything.

Because of the COVID border restrictions in NZ I can't get a service engineer into the country to do anything about it and I have a probe that's suddenly become a very expensive, very heavy paperweight.

Does anyone have any tips, tricks, and/or suggestions as to how I can unstick my PCD?

Thanks!
David

Hi David,

I posted elsewhere on the forum about my JEOL PCD problems a while back. Mine went through a year of sticking erratically without the engineer being able to fix it. Cleaning it fixed it for a week or two. We could observe scratching on the plate, so something had too much play in the mechanism.

Relevant to your problem: Initially the engineer tried to bend the spring *in a specific way*. Apparently that worked in Europe on a JEOL previously. But that didn't solve it. But you could try it if you're desparate?

Since then, I bought a new one. The problem came back several months after the new one was installed...we're monitoring it and I told them if it reccurs I'm invoking warranty. I wonder if the problem may be the composition of the alloy...I heard a rumor they changed the composition at some point.

Good luck,
Deon.


DavidAdams

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Re: System maintenance/fix-it tips and tricks
« Reply #7 on: July 19, 2020, 03:12:16 pm »
Hi Deon,

Thank you for your reply. It's very interesting (and not very encouraging) that you are seeing similar behaviour on your instrument.

I've found that when the PCD gets completely stuck and stops retracting entirely that if I vent the chamber, exercise the PCD for a few seconds then evacuate the instrument once again that the PCD becomes unstuck but the problem always seems to return.

Hopefully once NZ border restrictions are eased then I can get a service engineer over here to have a look at it.

Best,
David
David Adams
The University of Auckland
Faculty of Science | School of Environment