Agilent Technologies 5975C TAD VL MSD Troubleshooting And Maintenance Manual page 154

4
General Maintenance
To remove the GC/MSD interface heater and sensor
Materials needed
• Screwdriver, Torx T-15 (8710-1622)
• Hex driver, 1.5 mm (8710-1570)
Procedure
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The GC/MSD interface operates a very high temperatures. It is also well insulated.
WARNING
Make sure the interface is cool before you touch it.
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Heat and oxidation often result in a heater or, less frequently, a temperature
sensor being "welded" inside the heater sleeve. The holes for the heater and
sensor pass all the way through the heater sleeve. A rod can be inserted to
drive the stuck part out. However, to function correctly the heater and sensor
must have perfect contact with their holes. If a heater or sensor is difficult to
remove, the holes will probably be damaged enough that the heater sleeve
should be replaced. Polishing the holes is not an acceptable solution since it
will enlarge the holes.
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Vent the MSD.
Make sure you turn off the GC/MSD interface heater. This heater is
controlled and powered by the GC.
Separate the MSD from the GC.
Remove the cover from the GC/MSD interface.
Slide the insulation off of the GC/MSD interface
Loosen the two heater sleeve screws.
Slide the heater sleeve off of the GC/MSD interface. It may be necessary to
gently
pry open the slot in the heater sleeve to loosen the heater sleeve
from the interface.
Loosen the setscrew and remove the heater and temperature sensor from
the heater sleeve.
5975 Series MSD Troubleshooting and Maintenance Manual
(Figure 28).