D.8.3 Checking The Transmitters Before Deployment - Klein 5000 SERIES Operation And Maintenance Manual

D-41
Towfish

D.8.3 Checking the Transmitters before Deployment

Refer to the troubleshooting charts in Table D-1 on page D-42 and Table D-6 on
page D-58. These charts allow you to trace signals from the transducer crystals
throughout the towfish electronics. The connectors labelled 1P and 2P are on the
the port transducer and they connect to the top and bottom, respectively, of the port
Receiver board. Similarly, the connectors labeled 1S and 2S are on the starboard
transducer and they connect to the starboard Receiver board. To activate the Test
Code, select it from the Towfish Diagnostics tab of the Sonar Interface dialog box.
Each transducer on the towfish has twelve crystal elements. These elements are
divided into six pairs. Each pair is driven by one transmitter, and each transmitter
drives the specific pair on both transducers. For example, if a transmitter fails, say
TX4, then transducer elements seven and eight on both the port and the starboard
transducer would not transmit.
To verify that the transmitters are working, run an oscilloscope probe with the
scope tip in place along the transducer and see the transmit waveform as in the
image in Figure D-14. If there is a problem with a transmitter, it will show up as a
very weak transmit waveform.
Figure D-14:
Transmit Waveform
D.8.4 Checking the Receivers before Deployment
With the towfish running on deck, start SonarPro. Allow the TVG gain to adjust,
and then rub the transducers firmly, one transducer at a time. This is the rub test.
The image in the Sonar Viewer window should look something like that in
Figure D-15.