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4-3
4.4 Test
The self test facility checks the keyboard,
ROM and RAM for proper operation. You
may run the test as follows.
1. Press the [MENU] key.
2. Select Self Check. The following
display appears.
SELF TEST
KEY Board TEST :
Press each key and
note that the cor-
responding key on
the screen turns
black.
Prog. No. 03591371**
ROM : OK
RAM : OK
On Hours 000008.3H
Tx Hours 000007.9H
<MENU> = MAIN MENU
**: Program version no.
M851
Figure 4-1 Test screen
3. To check the keyboard, press each key
except the [MENU] key. Its
corresponding location on the display
lights in black if the key is operating
properly.
4. To escape from the test, press the
[MENU] key.
The ROM and RAM are automatically
checked. If NG (No Good) appears to the
right of ROM or RAM indication, contact
your dealer for advice.
NMEA data can be displayed on the test
screen as follows;
1. Press the [+] key. NMEA data appears
on the upper half of the screen.
2. Press the [TONE] key to select input
source; NAV, HDG or E/S.
3. To display the NMEA data over the
entire screen, press the [-] key three
times.
4. To erase the NMEA data, press the [+]
key.
4.5 Replacing the
Magnetron
When the magnetron has expired distant
targets cannot be seen on the display. When
you feel long range performance has
decreased contact a FURUNO agent or
dealer about replacement of the magnetron.
Magnetron type: MG5248
(Code No. 000-116-121)