Figure 6. CADU Won't Communicate With the DAU

TM-1-6625-724-13P Aviation Vibration Analyzer Manual
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0025 00 TM 1-6625-724-13&P 0025 00-6 Figure 6. CADU Won't Communicate With the DAU Is External Power on, green power light on DAU is lit? NO Does CADU display lamp stay on when lamp button is pressed then released? Is 28 Vdc being applied to DAU? YES NO YES Is DAU Switch On? Check that aircraft Aux. Power Connector has 28 Vdc. NO YES Is CADU to DAU Cable connected? NO YES Turn on DAU Replace DAU Fuse Problem still exist? Send DAU to TMDE for repair NO YES Connect Cable After disconnecting UTD cable at DAU does CADU display lamp stay on? NO YES Replace UTD Cable Re-connect UTD Cable Replace CADU to DAU Cable Does CADU communicate with DAU? NO YES Replace CADU Proceed with normal operation Replace CADU Cable

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