Thermo Scientific DSQ II, Hardware Manual

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3
Troubleshooting
RF and DC Control Symptoms
Thermo Scientific DSQ II Hardware Manual 141
±550 V is outside the acceptable range.
Possible Solutions
• The DC driver is faulty or the +36 V is missing. Make sure the DC driver is plugged in
and the +36 V power supply is working correctly.
RF and DC Control Symptoms
Automatic RF frequency calibration or RF dip and gain problems can be caused by several
things. Begin troubleshooting control problems using
DSQ II Tune diagnostics.
Diagnostics helps you identify whether the fault is due to a power supply problem, a break in
the RF signal path, or a faulty component. Figure 3-1 is an excellent resource to begin
troubleshooting RF control problems.
If the symptom is observed after performing work on the instrument, it points to mechanical
issues; if the symptom arises suddenly during operation of the instrument, it indicates a fault
condition.
RF dip calibration shows random noise instead of a smooth RF dip.
Possible Solutions
• There is a loose cable. Check these cables:
• Quadrupole mass filter is not connected to RF feedthroughs. Vent the system and check
the two connections. The two wires from the quadrupole mass filter should be connected
to the top and bottom RF feedthroughs on the rear pins. The connections to the
quadrupole mass filter may also be
loose.
Table 5. Possible loose cables
Cables
Analog to Low Pass Filter board
Analog to RF Detector board
Analog to RF Generator board
Cables from DC Driver to Low Pass Filter board
Cables from RF Coil to RF Detector Capacitor or RF Feedthroughs
Lens Interface to Low Pass Filter board
RF Detector to DC Driver and RF Generator board
RF Generator to Low Pass Filter board