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Service Manual
Symptom
WS Alarm-
Sysfail, All IO terminals Bus (1-4)
Com
WS Alarm-
Sysfail, IO terminal Bus (1-4) fuse
Faulty values or faulty feedback
from equipment connected to MaC
system
22
Cause
No power in any
1
terminal on one
bus
2
3
4
Broken circuit
1
between I/O Unit
and I/O Box
2
3
Fuse is broken on
1
terminal
2
Power supply is
1
not working
2
3
Faulty valves,
1
pumps, sensors
etc
Loose cables on
1
terminals
Faulty terminal
1
2
3
Action
Check if many green Power
LED's on the terminals are put
out
Check if the power supply is
functioning
Check cabling
Replace the Power Supply
In the Saab TankRadar I/O Box,
check the communication LED
on the RS-485 PCB Refer to as-
built drawings to find right PCB
Look for loose cables
Contact a Saab Marine
Electronics' service agent
In the Saab TankRadar I/O Unit,
identify the terminals where the
green power LED is put out
Replace fuse
Check Power Supply voltage
Replace Power supply
Contact a Saab Marine
Electronics' service agent
Check the equipment connected
to the Saab TankRadar I/O Unit
Check cables connected to the
terminals that the equipment is
connected to
Check terminal
Replace the terminal
Contact a Saab Marine
Electronics' service agent
G3 MaC Second edition, March 2000
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