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Marine antenna

Fault Finding

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Page 2

Power failure

n Power unit task

FRegulate the 24V from the

TPU to 6.5V, +13V and

-13V

n Symptoms:

FA: Antenna doesnt

move at all

n Measurements:

FA1: Power from the

antenna cable: 24V

FA2: Power from Powerunit to Tracking unit

J14-3, p5: 6,5V

J14-3, p6: +13V

J14-3, p7: -13V

FA2: Power from Tracking

unit to Power unit

J14-3, p9: 24V

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Elevation movement failure 1

n Elevation task

FActivate Elevation offset

when TPU is turned on

FMove to differentdegrease in elevation.

n Symptoms

FA: Elevation offset is not

activated, but it has

elevation movements

FB: Antenna does not

move in elevation under

initialization.

n Measurements

FA: Tracking unit is

probably not given the

offset signal

FB1: Power from Tracking

unit:

J14-1, P1-2 +/- 13V

FB2: It is a faulty with the

Elevation motor control,if B1 and elevation offset is OK.

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Elevation movement failure 2

n Symptoms following

from last page

FC: Antenna move in

wrong elevation fromnormal initialization

movements

FD: The antenna

movement is rough

n Measurements following

from last page

FC: Adjust the sensor unit

to 45 deg. respectiveelevation in 90 deg.

FD: the strap is to Slack or

to tight

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Azimuth movement failure

n Azimuth motor task

FStep in azimuth under

initialization or when

commanded from Cross

elevation switch.

n Symptoms

FA: Antenna does not

move in azimuth

FB: The antenna

movement is rough

n Measurements

FA1: Faulty on the

Azimuth step motor or

power from Power supply

PCB

FA2: faulty on Cross

elevation switch

FB: the strap is to Slack or

to tight

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Cross elevation faulty

n Cross elevation motor

task:

FFine-tuning on satellite

signal. Give a message tothe Azimuth step motor

to turn left or right.

n Symptoms

FA: No movement in cross

elevation

FB: The antenna patch

tramples in one edge,

trying to give information

to azimuth motor to turn.

n Measurements

FA1: Simulate movements

in azimuth to check if the

antenna crossing

movements follows. If it

do not follow the Cross

elevation DC motor or

Tracking unit can be

faulty

FA2: Tracking unit failure

FB: Check the earth point

on each edge on the

Azimuth motor switch, or

check if it is a azimuth

failure

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RF-card failure

n RF card task:

FTransfer the TX and RX

n Symptoms:

FA: Initialization works fine,

but it is not possible to get

a connection. The

antenna keep searching

and searching.

n Measurements

FA1: RF- card faulty

FA2: Control unit faulty