MDP-621/641/640 Chapter 11
Operation manual Trouble Shooting
(Sounder)
Faults detected Possible cause of the failure
Remedial action against negative
result
No depth indication but
XXXX shown.
1. Is the bottom echo displayed
within the display?
2. If YES, then, is the bottom
displayed in red?
1. Select an appropriate depth
range in which the bottom is
displayed.
2. Adjust the GAIN control to
obtain the red sea bottom.
0093161022-06 11-3
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