Furuno CSH-53, Installation Manual

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Interface Unit Adjustment
E/S LEVEL control on the display unit at allows adjustment of the picture color on the screen.
However, if adjustment of the E/S level control can not get the best coloration, perform fine
adjustment with the preset potentiometers on the I/O board in the interface unit as follows.
R27 (W/L INHIBIT TIME)
R36 (OFFSET)
R55 (W/L GAIN)
R56 (E/S GAIN)
S02 MODE: Selects the signal mode (AC or DC)
according to the combined echo
sounder. Default setting is “AC”.
S01 FNZ MARKER: The FNZ marker is plotted on the echo sounder picture
when this switch is set to ON. Default setting is the "ON"
position.
I/O 10P0047
AC DC
Figure 8-6 I/O board
Adjustment of signal level (potentiometer R36, R56)
Prior to adjustment, verify that the output level of the E/S Interface VI-1100A satisfies the
following ratings.
1) For AC INPUT
5Vp-p
max.
2) For DC INPUT
-6V
0V
Figure 8-7 E/S interface output levels
If not, adjust the potentiometers in the VI-1100A referring to the installation manual for the
FCV series.
Procedure
Turn the E/S GAIN and E/S OFFSET potentiometers (R56 and R36) so that the color gradation
of E/S picture on the screen appears similar to the intensity gradation of the combined E/S
echogram.
Case (A) The E/S picture on the CSH-73 is comparatively higher in sensitivity than that of
the paper echogram. Adjust the E/S OFFSET potentiometer so that weak signals
painted in blue or light blue is displayed in deep blue.
Case (B) The E/S picture on the CSH-73 is comparatively lower in sensitivity than that of the
paper echogram. Turn the E/S GAIN potentiometer clockwise until the picture is
even in quality.