DATASONICS SIS-1500 System Manual page 97

SIS-1500 Seafloor Imaging System
The sonar displays do not
update.
The sonar displays are
noisy.
SECTION 5 Maintenance and Troubleshooting
Table 5-2 Tow Vehicle Activation Problems
Symptom
The DSP board in the
workstation is not properly
connected.
The Synchronizer board in
the workstation is not
functioning.
The Digitizer board in the
sonar electronics is not
functioning.
The digital multiplexer's high
voltage power supply is not
turned on.
The deck cable or the
armored coaxial cable is
faulty.
The shipboard power is noisy
or noise is being coupled onto
the deck cable.
If a UPS (Uninterruptable
Power Supply) is being used,
its output may be noisy and is
causing interference.
Possible Cause Corrective Action
Check the wiring to the DSP
board, and then remove and
reinsert the board.
Check the back panel LED. It
should be flashing at the
repetition rate of the
transmitter. If not, replace the
Synchronizer board.
Replace the Digitizer board if
it has failed.
Verify that the ON/OFF and
HIGH VOLTAGE indicators
on the front panel of the
digital multiplexer are on.
Refer to Cable Checks on
page 5-19 and check the
deck cable or the armored
coaxial tow cable.
Check the shipboard power
for interfering signals. Also
verify that the deck cable is
not suspended and acting as
an antenna and that the
winch and slip ring assembly
is properly grounded.
Disconnect the processor
from the UPS and connect it
directly to a VAC power
source that is not on a UPS. If
the display updates properly,
the UPS is noisy.
If the display still does not
update properly, disconnect
all the external devices from
the processor. If the display
updates properly, then
isolators should be used with
all the external devices, such
as an RS-232 isolator
between the navigation
system and the processor.
System Troubleshooting
5-15