Document: 990-0000046-1000
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When the cable connector on the towfish arm pulls out during recovery from a snag, it causes the
cable voltage to be exposed to seawater. Immediately turn off the towfish power when this
occurs to prevent electrolysis on the connector pins. Always check the female tow cable
connector for any evidence of burning prior to rearming the fish. If so, the tow cable may have to
be re-terminated.
Use a light coating of silicone grease every time the marine connectors separate. Do not pack the
female connector with grease unless it is to be stored away for a long period. Clean out the
female the connector pins of any grease prior to use. Failure to do this will cause a hydraulic
lock preventing them from being properly mated.
7.4
T
ROUBLESHOOTING
G
UIDE
There are two alternatives in operating the 4200-FS towfish. One is to use the full topside
compliment and a test tow cable. This is the best configuration. If a topside processor is
unavailable or out of commission an external keyboard, mouse and video monitor can be
attached to the towfish CPU card. This requires that the fish is open. It gives limited test
capabilities, but allows one to use the fish’s internal self-test features.
The following is a simple system checkout procedure. Possible trouble areas are identified for
the indicated symptoms. It is not intended to be a complete troubleshooting guide, but the
identified trouble areas reflect the most obvious and easily identified possibilities.
Note:
Only take the towfish apart as a last resort.
7.4.1
N
ON
D
EPLOYMENT
T
ESTS
Test
Possible Trouble Area(s)
Perform sonar processor diagnostics to
verify that it is operating properly
Check all cabling and connectors.
Modem Unit to Sonar Processor Unit, if
separate external modules
Towfish to topside Modem connections
Turn System on
Wait for topside and towfish to boot
Check for error messages in the SONAR
window. If there are no error messages, one
can assume that the data link is working.
Note: The data link between the topside and
subsurface components has to be working
before attempting any other troubleshooting
procedures.
