Last Update: 2nd December 2019

Basic Troubleshooting

This page illustrates how to solve the troubles that frequently occur while the operation of the Nobeyama 45-m telescope.

SAM45 error

One of the most frequent errors on the Nobeyama 45-m telescope is "SAM45 error". This kind of errors is related to the degital spectrometre SAM45. When your observation suddenly stops with red messages such as "SAM45: XXXXX error" ("XXXXX" is changed the corresponding module that shows an error) on the COSMOS monitor, please follow the procedure below:

  1. "Start Observation" again
    If the error is not serious, observations proceed without errors again.
  2. clearSAM (reboot the spectrometre)
    If restarting the observation has no effect (the observatioin stops with the same message), please try to reboot the spectrometre SAM45.
    Open a terminal at any monitor by clicking left button on the mouse.
    Then type clearSAM and run the command.

    clearSAM command

    Wait about seven minutes.
    If the reboot is properly done, all countdown message will be over and the terminal waits for a user input.
    Please return to your observations.
  3. panda_reboot (reboot an analog-to-degital converter)
    If step 2 does not work, to reboot an analog-to-degital converter may help.
    Open two terminals at any monitor.
    Then type clearSAM at one terminal and run panda_reboot all in the other termianl.

    panda reboot command

    This procedure can be performed at the same time.
  4. restartWSs (reboot all relavant workstations)
    In case that all steps shown above end in vain, try the final hope, to all relavant workstations for the spectrometre.
    Open a terminal and run the command restartWSs.

    restartWSs command

    It takes about 10 minutes.
    After the process is finished, run clearSAM again.
  5. Give up the Obsevation
    If everything you tried does not change the situation, all you can do is to give up the observation on that day.
    During daytime, the computing team will recover the system.
    Therefore, please report the details on #trouble_report channel at Rocket.Chat.

Sometimes, clearSAM does not finish (repeat the process again and again). Please inuput Ctrl+C at the terminal to end the process and report the details on #trouble_report channel at Rocket.Chat. Unfortunately, you cannot continue your observation in that case. The observatory will try hard to resolve the issue as soon as possible.

IF error: the IF tuning program stops

During the observation, the IF tuning program may suddenly stop without any error (sometimes, an error message appear on the COSMOS Monitor in the NRO_RemoteObs_1 viewer) This can be checked and fixed at the NRO_RemoteObs_4. Search the window with a title of "x0vncserver - TigerVNC".

IF monitor

If you cannot find it, double-click the icon "IF" on the desktop window in the NRO_RemoteObs_4 viewer.

icon for the IF monitor

In case that the program stops, the terminal waits for the input. However, please make sure the program acctually stops with the following process:

  1. Open a new terminal
  2. Type the command
    ps aux | grep
    check whether the process for IF attenuator tuning is alive

If the result contains /usr/bin/sh /home/45mrx/bin/, the process is still alive (In this guide, the process is alive). In this case, other cause that is not resolved yet would be a reason for the error.

Otherwise (the process is terminated), type the following command at the original terminal: and close the new terminal that is used for checking the process.

IF attenuator value error or failure during the IF attenuator tuning process

You can do it at the web browser (Firefox) in the NRO_RemoteObs_3 viewer.

  1. Select "LAN-tap for IF down-converters" page from bookmarks.
    Although the page requires a user ID and a password, these two are already memorised in the web browser. Thus, just click the top box and choose the suggested candidate (only one candidate). LAN-tap_for_IF_down_convert top page
  2. Click the power control button
    LAN-tap_for_IF_down_convert main window
  3. Push the power off button for No.1 - 4
    To power off for all IF down-converters
  4. Wait a few seconds
  5. Restart the system by pressing the power on button for No.1 - 4
    To power on for all IF down-converters