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FS 20/25 Operators Manual 901-10037001/1.1
Maintenance and Troubleshooting Page 5.1
9
Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada
The system configuration, if installed correctly, will have the cable that plugs into PC
COM Port 1 establish communication with the LF1 Sub-assembly (Vertical Head).
The cable that plugs into PC COM Port 2 will establish communication with the LF2
Sub-assembly (FS925). Using the above symptoms as an example, if you did a full
system run up, eventually the Vertical head would start to work but the FS925 would
not.
Assume the problem is a hard fault with the PC COM Port 2; if you swap the cables
on the back of computer, go through the process of connecting and then detecting
the heads, you will see the same window as above. The difference will be that this
time if you do a full system run up, the FS925 head will start to work and the Vertical
head will not.
If the problem was with one of the LF Sub-assemblies, there will be the same type of
indication as above with one of the COM Ports showing a head attached; one head
would operate if you do a full system run up. If you swap the cables on the back of
the computer and do a full system run up the same head will operate, only it is via
the other COM Port.
The following chart lists some of the “digital” type problems, possible causes and
how they can be verified.
Problem Action/Possible Cause
No Head Connection/Detection Is COM Port enabled (red check)
Ensure COM Port(s) enabled
No Head Connection/Detection
-PC COM Port Problem
Do full system run up, one head
should work, the other won’t
Swap cables on back of PC
Full system run up, the other
head will work, the first won’t
Will require service ashore
Option would be to run the head of
your choice on the working COM
Port, disable the other COM Port until
PC is repaired
No Head Connection/Detection
-PWR/TTM LF Sub-assembly
problem
Do full system run up, one head
should work, the other won’t
Swap cables on back of PC
Full system run up; the one head
will not work on either COM Port
Will require service ashore
No option; you will only have use of
the one head until the PWR/TTM
repaired
91


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