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4205 SIDE SCAN SYSTEM 0021769_REV_D
7.9.7 Towfish
Before troubleshooting the Towfish, first verify that the command and data links between the towfish and
topside are working, as described in 7.9.5
COMMAND AND DATA LINK.
NOTE: It is recommended that all attempts be made to see if a problem
is external to the Towfish before opening it. Also, contact EdgeTech to
receive prior approval to open the towfish chassis so as not to risk voiding
the warranty.
WARNING! High voltage (400 VDC) is always present in the electronics
assembly when powered.
7.9.7.1 No Sonar Data
If the sonar display does not scroll, use the ‘scope sniffing’ approach as outlined in sub-section 7.9.2
T
RANSMISSION VERIFICATION to check transducer firing. If the transducers are firing, the data link is working;
the problem is most likely related to the topside processor and/or data modem.
If the display scrolls but is blank, and the transducers are firing, the problem most likely lies with either or
a combination of the Towfish receiver, transducer, and its signal processing circuitry. Establish if the
problem is on a single channel or all channels.
If data is absent in all or individual channels, check the SSB boards. If the problem is with a channel, also
check the respective power amplifier and transducer element.
Connect to the towfish using REMOTE DESKTOP 192.9.0.101 login: administrator, password: admin. Sonar
application should be running, and there should not be any errors posted to the window.
7.9.7.2 Reported Errors
indicates the CPU does not connect to the sonar processor card
“IF_DIAG”
Indicates the Sonar Processor has detected an error and will not run.
Cycle power on Towfish recheck error. If an error is still present, check
the cables running to and from the Sonar Interface Card
HM_Sensors”
Indicates the 48 volts of the operating power supply. If this error is found,
check the output of power distribution board in Towfish and the power
Table 7-6: Reported Errors
7.9.7.3 Other Checks
Periodically check the integrity of the sea ground capacitor attached to the rear bulkhead.
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