To Remove The Gc/Msd Interface Heater And Sensor - HP 5973 Hardware Manual

To remove the GC/MSD interface heater and sensor

Materials needed:
Screwdriver, TORX T-15 (8710-1622)
1 Vent the MSD (page 52).
Make sure you turn off the GC/MSD interface heater. This heater is controlled and
powered by the GC.
2 Separate the MSD from the GC (page 112).
3 Remove the cover from the GC/MSD interface.
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4 Slide the insulation off of the GC/MSD interface.
5 Loosen the two heater sleeve screws.
6 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.
7 Loosen the setscrew and remove the heater and temperature sensor from
the heater sleeve.
Heat and oxidation often result in a heater, or less frequently a temperature sen-
sor, 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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Installing a new heater and sensor in a damaged heater sleeve will result in poor
performance of the heated zone and could reduce the lifetime of the new parts.
To remove the GC/MSD interface heater and sensor
Maintaining the MSD
4
173