4-15
Model 979 Series Helium Mass Spectrometer Leak Detector
DRAFT 9/15/03
5. Remove the ground slit plate (Figure 4-15) by placing a thin, slotted screwdriver snug
into the slot and carefully twisting and prying with the screwdriver.
Figure 4-15
Ground Slit Plate
NOTE
A locking screwdriver designed to grab onto the slot of a screw
will work very well for this procedure.
4.3.4 Removing the Preamplifier
CAUTION
The preamplifier is a static sensitive device. Wear a grounding
device while the preamplifier is being handled.
1. Remove the 4 Phillips screws that hold the preamplifier header piece, repeating steps 1,
2, and 3 to release the preamplifier (Section 4.3.2 “Removing the Button TC” on
page 4-11) to release the preamplifier.
2. Carefully remove the preamplifier from the spectrometer tube body (Figure 4-16) and
place it carefully on a clean, safe, non-magnetic surface.
Figure 4-16
Removing the Preamplifier
Summary of Contents for 979 Series
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