User guide

901-10037001/1.1 FS 20/25 Operators Manual

Page 5.20 Maintenance and Troubleshootin

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

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

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.