09420A DCN8343
Teledyne API Model 480M O
3
Monitor User Manual
47
7.5. AUTO-ZERO VALVE REPLACEMENT
1.
Disconnect power from the 480M.
2.
Open front panel.
3.
Locate the auto-zero valve (See Figure 7-1).
4.
Unplug the two-pin valve connector from the mainboard PCA.
5.
Remove the silver retainer clip from the top of the sensor valve. A pair of pliers may
be used to slide off the retainer clip.
6.
The valve coil can now be removed by sliding upwards.
7.
Remove the two (2) mounting screws using a #2 Phillips screwdriver. Note that there
are four screw heads visible on the top of the valve body, only two (2) of these should
be removed. Use the new valve as a reference to determine which two screws need to
be removed.
8.
Note the orientation of the valve body on the manifold so that the new valve can be
installed in the same orientation.
9.
Remove valve body from sensor manifold.
10.
Clean any residue or dirt off the surface of the manifold using a lint-free cloth and
distilled or DI water.
11.
Install the new valve by reversing steps 1-7.
