Furuno FR-2125V - Manual (Page 16)

1-5
1.4 CRT Brilliance
The [BRILLIANCE] control on the control head of the display unit adjusts the entire screen
brightness. Note that the optimum point of adjustment varies with ambient light conditions,
especially between daytime and nighttime.
Note: The CRT brilliance should be adjusted before adjusting relative brilliance levels on
the BRILLIANCE menus to be explained later.
1.5 Tuning the Receiver
Tuning method can be selected at the RADAR 3 menu; auto or manual.
1. Press the [RADAR MENU] key.
2. Press [0], [0], [2], [0] and [0] in sequence to display the RADAR 3 menu.
3. Press the [9] key twice to select AUTO or MAN(ual).
4. Press the [ENTER] key to confirm your selection.
5. Press the [RADAR MENU] key to close the menu.
1.5.1 Automatic tuning
The radar receiver is tuned automatically each time the power is turned on; thus, there is
no front panel control for tuning. The tuning indicator and the label AUTO TUNE at the top
right corner of the display unit show the tuning circuit is working.
1.5.2 Manual tuning
If you are not satisfied with the current tune setting, follow these steps to fine-tune the
receiver:
1. Set the tuning method to manual as described above.
2. While observing the picture on the 48 mile scale, slowly adjust the [TUNE] control in
the tuning compartment and find the best tuning point.
[TUNE] control ERROR lamp
Figure 1-4 Control head, showing tuning compartment
3. Make sure that the radar has been set to the best tuning point. This condition is where
the tuning indicator lights to about 80% of its total length. Note that the tuning indicator
will never extend to full length.