Thermo Scientific DSQ II, Hardware Manual

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3
Troubleshooting
RF and DC Control Symptoms
Thermo Scientific DSQ II Hardware Manual 143
The Det RF and RF Mod lines are erratic.
Possible Solutions
• There is a loose cable. Check these cables:
• There is a problem with the RF control board, low pass filter board, the RF generator
board, or the RF coil. Contact Technical Support.
• There is high voltage arcing. Vent the system and check the quadrupole mass filter and
prefilter. Also, check the wires inside the RF coil box. Make sure the four wires going to
the RF feedthroughs are far from any surface and especially each other. Check for burn
marks or evidence of arcing. Clean components if necessary. Replace the components if
problems persist.
Rod DC diagnostic fails.
Possible Solutions
• If all tests fail, the DC driver is unplugged or faulty. Check all cables to the DC driver. If
necessary, replace the DC driver, as described in “Replacing the DC Driver” on page 83 .
• If A Rod DC and B Rod DC fail but Average DC passes, RF dip, RF gain, or RF null
may be adjusted incorrectly. Check RF dip and RF gain calibrations. The RF may not be
working properly or the DC driver is disconnected or faulty. Check the RF null (see the
DSQ II User’s Guide ).
Table 6. Possible loose cables
Cables
Analog to RF Detector board
RF Detector to DC Driver and RF Generator board
Lens Interface to Low Pass Filter board
Analog to Low Pass Filter board
RF Generator to Low Pass Filter board
Cables from RF Coil to RF Detector Capacitor or RF feedthroughs
Cables from DC Driver to Low Pass Filter board
Analog to RF Generator board