Fluke Calibration 4322-SYS-NAVAIR, Руководство по обслуживанию

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4322
Service Manual
4-38
Main PCA and P-VLV PCA
Use the following instructions and reference Figure 4-20 to replace the main pca (

) or
the p-vlv pca (

).
1. Use the instructions in “Access the Electronics Box” to open the electronics box.
2. Disconnect all wire connectors from the main pca (

) and disconnect the two
precision control valve connectors to the bottom of the p-vlv pca (

). See Figure 4-
20 for an illustration of all the connectors.
3. Remove the four screws and washers (

) that secure the main pca (

) to the p-vlv
pca standoffs (

).
4. Remove the main pca (

) from the electronics box (

).
5. Remove the standoffs (

) that secure the p-vlv pca (

) to the electronics box (

)
6. Lift the p-vlv pca (

) out of the electronics box (

). The amplifier pca assemblies
(

) will stay in the electronics box (

).
7. Carefully align the new p-vlv pca (

) on top of the amplifier pca assemblies (

).
8. Once aligned, slowly push down on the new p-vlv pca (

) to connect the two
amplifier pca assemblies (

).
9. Install the standoffs (

) that secure the p-vlv pca (

) to the electronics box (

)
10. Install the four screws and washers (

) that secure the main pca (

) to the p-vlv pca
standoffs (

).
11. Install the main PCA (

).
12. Connect all wire connectors from the main pca (

) and connect the two precision
control valve connectors to the bottom of the p-vlv pca (

). See Figure 4-20 for an
illustration of all the connectors.
13. Use the instructions in “Chassis and Control Panel” on page 4-9 to install the control
panel and put the chassis back into the case.