Problems with loading modified methods in Chemstation with 7890A GC

Hello all. We have been having quite the hard time with out GCMS setup lately. We have a 7890A GC and 5975C MSD along with MSD Chemstation version E.02.00 with service pack 2 installed.

The problems started when our chemstation crashed so badly that the MSD was no longer proving and information to chemstation. We decided it would be best to make a fresh install of windows on the computer, to defrag the hard drive and once everything is ready, to follow the instructions to reinstall chemstation. That has all been done. The LAN was set properly, all instruments ping well and communicate with chemstation, the MSD pings it properly, the GC shows the name of the computer on the communcations panel.

Now the major issue we are having is that when we try to modify the default method to a method more suited for our separations, we save it as lets say Default-1 and when we try to run it, the GC does not respond and we get an error message displayed in the green bar at the bottom of the chemstation window. At this point, chemstation kind of freezes and forces us to close it through task manager. Otherwise, the default method runs. This method is 1 minute and does not use ALS, so it really is not the type of method we are looking for. At this point, I am unsure of how we should proceed. I have a feeling that this is something like a settings issue because all instruments seem to be properly communicating. For example, if we give the command to the GC to change temperature or change air/He/H2 flow rate it follows, so the communcation is setup, there's just something preventing the GC from running these modified methods. Any suggestions are very welcome!

  • Hi  

    can you provide us with a picture to this error massage.

  • Hello,


    I will take a picture when I go back to the lab tomorrow. I must also let you know that we were able to extract an old method from the GC. This method had been downloaded into the GC from before everything crashed. When using this method, the GC responds and actually automatically injects the sample and we are able to get a TIC. Some of the settings however do change instead of staying stabe but at least we can use this method to create new ones that can run on the GC. That being said, we still want to fid out why the default gives this error. I will provide images tomorrow.

  • Hello again, I will be unable to show you a picture because we are somehow able to run samples using the method downloaded from the GC and we are worried that running the modified default might have a negative impact on our barely-functionong setup.


    To give you an idea of the error, it just shows up at the bottom of the chemstation window, in the long fluorescent green bar that extends at the bottom of the window. 

  • Hi  

    I'd rather see a picture of the error message  because it shows a lot of things.

    Anyway, first I would recommend taking a copy of the default method as a backup copy and save it in a flash memory or Another place to use it in case of corrupt the original method.

    Second  try to take copy from Default method (def_ GC.M ) and rename it with a different name lets say (gas .M)  and Then paste the new method in folder Methods.

    If the new method works with out any problem you can now modify method(gas .M) to suited for your separations

    I hope that helps you to solve this problem.



  • Hi ,

    I just wanted to follow-up to see if this issue is resolved. If so, please come back to the post, let us know what you found, and click Verify Answer on the response so it will make the solution more visible.  If you still need help, just let us know and we would be happy to continue working with you.

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