5-3
When performing
pre-deployment tests,
signals in Sonar
display are not
present
Tow vehicle cable harness
connections are loose
Verify all cable harness connectors in tow vehicle are properly
mated.
12 VDC power for preamplifier
is not present.
Measure voltage between 12 VDC OUT TO PREAMP test point and
PREAMP COMMON test point on back of Deck Unit. Voltage should
be 12 VDC.
If 12 VDC is not present, verify it is present on Tiger board in 3200-
XS Topside Processor.
If 12 VDC is not present on Tiger board, repair or replace Tiger
board.
5 VDC from preamplifier in tow
vehicle is not present.
Measure voltage between TOWFISH PREAMP 5 VDC test point and
PREAMP COMMON test point on back of Deck Unit.
Voltage should be 5 VDC.If 5 VDC is not present, check tow cable
and spider mold in tow vehicle, repair or replace as needed.
If 5 VDC still not present, replace tow vehicle’s preamplifier.
Vertical black
streaks are present
in Sonar display
connectors are loose or have
corroded contacts
Refer 4.1.3: INSPECTING AND CLEANING THE UNDERWATER CONNECTORS.
Reconnect connectors, if needed, secure them using duct tape.
Extended use has caused a
conductor in the tow cable or
the cable harness in the tow
vehicle to break
Check continuity of conductors in tow cable and cable harness.
Loose or flooded connector
Wiggle tow cable connections and connectors of cable harness in
tow vehicle while watching Sonar display for white streaks.
If white streaks are present, refer to INSPECTING AND CLEANING THE
UNDERWATER CONNECTORS. Reconnect connectors, and if necessary,
secure them using electrical tape or locking sleeves.
Periodic streaks in
Sonar display from
AC noise
System is not properly
grounded
Check the continuity between the GND connection on the back of
Deck Unit to ship’s ground.
Noise appears in
Sonar display
Engine noise is coupling into the
sonar frequency band
Isolate the engine noise
Tow vehicle is in or near ship’s
wake
Tow the tow vehicle at a deeper depth and farther away from ship
Tow vehicle is not level when
being towed
512i ONLY - adjust the trim tab
Tow vehicle is towed too fast
Lower the speed of the Vessel
Table 5-1: Rack Mount Troubleshooting
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