Furuno CSH-53 Operator's Manual page 90

Color scanning sonar
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13-4
Gray test
This test checks for screen distortion. To escape from the test
reset the power.
GRAY TEST
Q Q
Figure 13-6 Gray test
SIO test
This test checks for proper communication between the display
unit and transmitter unit, and requires a jumper plug. To escape
from the test reset the power.
SIO TEST
DRAW
SIO
IF
SIO
PISO
SIO1
SIO2
PIF
SIO1
Figure 13-7 SIO test
= NG
= NG
= OK
= NG
= OK

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