Honeywell Vibration Analysis System VXP

All cables should be inspected prior to operating or testing the VXP. If there is any obvious damage to a cable, it must be repaired in accordance with Chadwick-Helmuth MPI-001. This document covers all aspects of cable repair;

The VXP should be inspected each time it is used. At the minimum, a thorough inspection of all of the components should be performed every 12 months. Following are tables showing the routine inspection procedures for each of the major components;

The AU contains a battery that is used to maintain the contents of the SRAM in the absence of aircraft power. It has a life expectancy of approximately 5 to 7 years. This battery is located at the rear of the Power Supply & Expansion PCB assembly. The battery can be replaced by disassembling the AU to expose the PCBs

The battery replacement procedure is as follows: 1. Disconnect the Acquisition Unit from all cabling

3. Pull the two PCB assemblies and the isolation plate forward approximately 1-2 inches

4. Remove the four screws that attach the two 78-pin D connectors to the isolation plate

5. Carefully disconnect the two 78-pin D connectors from the Main PCB assembly and lift them out of the isolation plate. The PCB assemblies are now free from the harness and isolation plate

6. Remove the two PCB assemblies from the chassis

7. Carefully separate the two PCB assemblies from each other by disconnecting the board-to-board connectors on each side and near the center of the boards

8. Remove and replace the battery located at the rear of the Power Supply & Expansion PCB assembly (the bottom board). Replace with C-H Part No. 764-B04 or equivalent