Models 947, 948 and 960 Leak Detectors Operations and Service Manual
4-17
6. Put the heater cartridge
➀
back in its cavity (Figure 4-5).
Figure 4-5
Spectrometer Tube Reassembly (Ground Slit Plate)
7. With the new O-rings on each of the two deflection pole pieces
➁
, insert the pole
pieces into the spectrometer tube body
➂
, tighten the four slotted screws on each side
of the spectrometer tube, and note the positions of both the roll pin in the body and the
notch in the pole piece flange used for alignment.
8. When installing the ground slit plate
➃
, be sure that the snap prongs are facing up, then
align the slit at 90° with the side wall of the spectrometer tube, and concentrically align
the circular hole in the plate with the smaller guide hole in the bottom of the ion source
cavity
Figure 4-5, View A).
9. Wipe the new O-ring
➀
and mating surfaces with a clean, lint-free cloth and place the
new ion source
➁
in its cavity (Figure 4-6 on page 4-18) as follows:
❑
Place the locating pin
➂
approximately in the center of the guide hole.
❑
Ensure that pins 1 and 8
➃
are parallel to the side wall of the spectrometer tube as
shown in Figure 4-6 on page 4-18, View A.
❑
Tighten the flange cap
➄
evenly and firmly with the four Phillips head screws.
CAUTION
A short could result at power up if the alignment pin touches
the sides of the alignment hole.
➀
➁
➂
➃
A
A
Summary of Contents for 948
Page 175: ......
