Diagnostics and PCB and Assembly Replacement
Running the LTQ Diagnostics
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6-2 _______________________ Finnigan LTQ Hardware Manual _______________________
6.1 Running the LTQ Diagnostics
The LTQ diagnostics is used to test the major electronic circuits within the
instrument and indicate whether the circuits pass or fail the tests. If there is a
problem with the instrument electronics, the LTQ diagnostics can often locate
the problem. You can then often correct the problem yourself by replacing a
faulty PCB or assembly.
The LTQ diagnostics does not diagnose problems that are not electrical in
nature. For example, it does not diagnose poor sensitivity due to misaligned or
dirty components or to improper tuning. Therefore, it is important to have
someone who is familiar with system operation and basic hardware theory run
the diagnostics and use it to assist in isolating any problems.
Before running the diagnostics, you should consider the following:
• Did the system fail when you were running samples?
• Did problems occur after you performed maintenance on the instrument,
data system, or peripherals?
• Did you change the system’s configuration, cables, or peripherals just
before the problem occurred?
If the answer is yes to the first item above, there is the possibility of a
hardware failure, and running the diagnostics is appropriate.
If the answer is yes to one of the last two items above, the problem is probably
mechanical, not electrical. Reverify that alignment, configurations, and cable
connections are correct before you run the LTQ diagnostics.
To run the LTQ diagnostics, proceed as follows:
1. Tune the ring electrode and octapole RF voltages as described in the topic
Tuning the Ring Electrode and Octapole RF Voltages in the MS
Detector Maintenance chapter.
2. In the Tune Plus window, choose Diagnostics > Diagnostics. (To
open Tune Plus, choose Start > Programs > Xcalibur > LTQ Tune.)
The Diagnostics dialog box appears. See Figure 7-1.
3. Select one of the following options:
• To test all of the electronic subsystems (that is, the vacuum system,
power supplies, lenses, ion detection system, and RF voltage
electronics), click on the All tab and select the Everything option.
• To test an individual subsystem, click on the tab corresponding to that
subsystem and select the appropriate options.
4. Select how many times you want to run the tests, and whether or not you
want to print reports or to stop on a failure.
5. Click on the Start button to start the diagnostics.
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