09421A DCN8343
Teledyne API Model 480H O
3
Monitor User Manual
45
7.4. AUTO-ZERO VALVE REPLACEMENT
1.
Disconnect power from the 480H.
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.
