Agilent Technologies 5975C TAD VL MSD Troubleshooting And Maintenance Manual page 159

To adjust the quad frequency
Materials needed
• Screwdriver, flat-blade, large (8730-0002)
Procedure
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2
Do not remove any other covers. Dangerous voltages are present under these
WARNING
covers.
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
4
5
6
Do not use a coin to adjust the screws. If you drop it, it could fall into the electronics
CA UT IO N
fan and cause significant damage.
7
5975 Series MSD Troubleshooting and Maintenance Manual
Make sure the MSD is at thermal equilibrium. It takes at least 2 hours
after
all heated zones have reached their setpoints for the MSD to reach
thermal equilibrium.
Open the analyzer cover.
Make sure the RF cover on the side board is secure and no screws are
missing. A loose RF cover or missing screw can
adjustment.
In the Tune and Vacuum Control view, select Optimize Quadrupole Frequency
from the Execute menu.
Enter an m/z value of 100.
Slowly turn the quad frequency adjustment screws to minimize the voltage
displayed (Figure 29).
Turn the adjustment screws alternately. Turn each screw only a little bit at
a time. Keep the screws at
typically between 50 and 70 mV.
When the voltage is minimized, click Stop.
equal
extension. The minimum voltage is
General Maintenance
significantly
affect coil
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