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FS 20/25 Operators Manual 901-10037001/1.1
Maintenance and Troubleshooting Page 5.21
Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada
The following chart deals with issues referred to as “analog” type problems.
Problem Action/Possible Cause
Vertical Head will not move
-Problem in vertical head
Try backup head
Backup head works, problem with
first head (send for repair)
Vertical Head will not move
-Problem in FS925
Try backup head
Backup head doesn’t work
Stop system operation, turn
PWR/TTM off, connect 3
rd
wire
directly to vertical head (correct
voltage setting on PWR/TTM)
Power up, full system run up;
backup OR first head works,
problem is in FS925 (Pre-
Regulator board)
Service representative will have
to repair FS925
Option: Run FS925 as stand
alone (disable vertical head;
drawback is you lose sensor
module as well)
Second Option: Run vertical head
(with sensor module) directly from 3
rd
wire.
Do this ONLY if you have dummy
plugs for the FS925 2-pin
connector and 38”whip connector
to prevent salt water
contamination
Vertical Head will not move
-Problem in LF1 Sub-assembly
Neither Backup or first head will work
through the FS925
Neither Backup or first head will run
as independent units on 3
rd
wire
Cable gain high (254:255)
Will require service representative
No option; vertical head unavailable
until repairs made to PWR/TTM Unit
Send PWR/TTM Unit ashore for
repair
FS925 does not operate
Difficult to isolate if no backup available
as a comparator
93


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