TM 1-6625-724-13&P
0025 00
0025 00-19
Table 1. Error Reported on CADU Error Screen (cont.)
Code #
Message
4161:
Tachometer Failure on Input 2 ACTION: (1) Verify connection (2) Verify gap or Check tape
for optical Interrupter (3) Check cable
The DAU is receiving no timing pulses from the external magnetic or optical tachometer. Verify
the following:
7. Interrupter is connected to the correct channel.
8. Interrupter is gapped properly and working.
9. Optical interrupter is aimed at the reflective tape.
10. Correct cable is installed and working. Repeat measurements, as necessary. This is a
common problem caused by improper sensor connection to the DAU.
4162:
Tachometer Failure on CAL Source ACTION: (1) Power the DAU off and on (2) Wait 20
seconds, make a measurement
An internal hardware failure. Power DAU off and on and repeat the measurements. If failure
persists, send unit to TMDE for repair. Suspect bad Acquisition board in DAU.
4163:
Track Sensor Fault on Channel 1 ACTION: (1) Check cable (2) Check Installation angle
(ABT Installed backwards?) (3) Check lens (4) Possible Contrast Problem - Ensure
underside of blades are evenly darkened, or attempt to acquire data with UTD
approximately 10-15 degrees left or right of directly into sun
Verify the following:
1. The tracker is installed properly, including cable connection, installation angle, tracker arrow
pointing in the direction of rotation, and the sun is not shining directly into the tracker lens.
2. There is a proper light level for passive tracker or that reflective target is installed properly for
active tracker. Replace the tracker with different unit and repeat measurements.
4164:
Track Sensor Fault on Channel 2 ACTION: (1) Check cable (2) Check Installation angle
(ABT installed backwards?) (3) Check lens (4) Verify light level
Either an incorrect number of pulses, or no pulses, are being returned from the tracker. Verify
the following:
1. The UTD is installed properly, including cable connection, installation angle, tracker arrow
pointing in the direction of rotation, and the sun is not shining directly into the tracker lens.
2. There is a proper light level for passive tracker or that reflective target is installed properly for
active tracker. Replace the tracker with different unit and repeat measurements.
4165:
ABT Signal Corrupted ACTION: (1) Check cable (2) Check Installation angle (ABT Installed
backwards?) (3) Check lens (4) Verify light level
Either an incorrect number of pulses, or no pulses are being returned from the UTD. Verify the
following:
1. The UTD is installed properly, including cable connection, installation angle, tracker arrow
pointing in the direction of rotation, and the sun is not shining directly into the tracker lens.
2. There is a proper light level for passive tracker or that reflective target is installed properly for
active tracker. Replace the tracker with different unit and repeat measurements.
4166:
Blade Apparently Too Close ACTION: (1) Verify tracker Installation (2) Verify SETUP -
Check and Reload aircraft script file
System measures the blade velocity too slowly. Verify the UTD is installed properly and the
setup file agrees with the aircraft configuration. Repeat measurements, as necessary.
4167:
ABT Apparently Looking Beyond Blade Tip ACTION: (1) Verify tracker Installation (2)
Verify SETUP - Check and Reload aircraft script file
Verify the proper installation of the UTD. Repeat measurements as necessary.
