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Simrad FS25 Manual

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901-10037001/1.1 FS 20/25 Operators Manual
Page 5.20 Maintenance and Troubleshootin
g
Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada
Problem Action/Possible Cause
• Message Log Errors • ID 256 indicates some problem with
the Vertical Section (LF1 or COM1)
• Message Log Errors • ID 512 indicates some problem with
the FS925 Section (LF2 or COM2)
• Message Log Errors • As mentioned, there is an error code
with the ID that can relayed to a
repair facility by FAX or E Mail to aid
in determining how the unit is failing
5.5.3.2 PWR/TTM Unit to Deployment Package Units (Analog)
The “information” that is exchanged between the PC and the LF Sub-assemblies is
in a digital format. The digital commands are translated into an “analog” format in
the LF Sub-assemblies and sent down the 3
rd
wire to the heads. The analog
response from the heads, whether it is a command acknowledgement or sonar video
and status, is relayed back up the 3
rd
wire and translated back into a digital format
for transmission to the PC, where it is then displayed on the monitor.
Diagnosing a problem in this area is difficult; the fault could be in the LF Sub-
assembly issuing commands and receiving responses from the head or with the
head itself receiving the commands and responding. In the field, you could verify a
fault in the Vertical section (LF1 Sub-assembly) by running a back up vertical head.
If the second head doesn’t work, the problem likely is in the PWR/TTM. The
problem could also be in the FS925 head (see chart below for explanation). If the
backup head does work, the problem is almost certainly in the first head.
The same logic can be applied to the FS925 head, if you carry a back up FS925 on
board. If not, it will almost certainly require a service representative to isolate and
repair a problem in the FS925 section.
There will be specific head problems and symptoms discussed in the next section.
… 92 …


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