Furuno CHS-5LMARK-2-55 Operator's Manual page 81

Echo tests
Test Description
Echo-1 The echo-1 test checks the echo
display function of the monitor for
proper operation, emitting artificial
scan signals in 16 colors. If conducted
with the COMBI-2 mode active,
artificial echoes are shown in the
echosounder display to test the ES
interface.
The result of echo test is OK if the
echo sensitivity increases every 90°.
Echo-2 The echo-2 test checks the TVG
function on the PSW Board in the
transceiver unit for proper operation.
When the MENU key is pressed,
the equipment goes into start up
condition.
The result of echo test is OK if the four
echo signals appear in a cross shape.
Note: For the CSH-8LMARK-2, on the
[SONAR] menu, set [NOISE LIMITER]
to [0] and [HOR BEAMWIDTH] to
[WIDE] before conducting this test.
Echo-3 The echo-3 test checks the analog
multiplexer on the PSW Board in the
transceiver unit for proper operation.
This test is not available with the
CSH-8LMARK-2. When the MENU key
is pressed, the equipment goes into
start up condition.
Adjust the sensitivity of image with the
Range and Gain controls to display the
picture shown right. The result of echo
test is OK if echo is shown in all
directions.
Echo-4 The echo-4 test checks the BMF
Board in the transceiver unit for proper
operation. This test is not available
with the CSH-8LMARK-2. When the
MENU key is pressed, the equipment
goes into start up condition.
The result of echo test is OK if the four
echo signals appears as shown right.
8. MAINTENANCE, TROUBLESHOOTING
DISPLAY ECHO TEST
PRESS [MENU] KEY TO EXIT
TRX ECHO TEST
PRESS [MENU] KEY TO EXIT
TRX ECHO TEST
PRESS [MENU] KEY TO EXIT
TRX ECHO TEST
PRESS [MENU] KEY TO EXIT
Echo tests
Display
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