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2. MAINTENANCE, TROUBLESHOOTING
13
2.2 Life of the Parts
Fuse replacement
The fuse in the remote display protects the equipment from overcurrent and equipment fault. If the
fuse blows, find the cause before you replace the fuse. Use the correct fuse. A wrong fuse can
damage the equipment. See the outline drawings about the location of the fuse.
LED life
The life of the LED is approximately 46,000 hours. The actual number of hours depends on am-
bient temperature and humidity. The consumption current depends on the number of lighting
LEDs and the LED brilliance.
2.3 Error Screens
When the NMEA sentences are not input or are timed out, the RD-20 displays the following error
screens.
2.4 Diagnostic Test
The diagnostic test checks the system for correct operation. There are two types of diagnostic
tests; automatic test and key test.
Automatic test
1. While you hold down the UNIT key, press the PWR key to turn on the power.
2. Press the MODE key. The automatic test starts. To stop the test, press the PWR key.
Note: You can extend the display time for a screen by three seconds. Momentarily press any
key (except the PWR key) at the desired screen during the test. You can do this procedure up
to 10 times, that is you can extend the display time to a maximum of 30 seconds.
Type Code No. Remarks
FGMB 125V 2A PBF 000-157-479-10 12-24 VDC
WARNING
Use the correct fuse.
A wrong fuse can damage the equipment
and cause fire.
Example: Rudder
angle
RUDDER
deg
P
SPEEDAUTO
kn
DEPTH
DBK
ft
Example: Speed
in [AUTO] mode
Example: Depth
in not [AUTO]
mode
--
.
-
---
.
-
Example: Total
distance in
[AUTO] mode
N
M
kn
GPS
A
--
.
-
------
.
-
---
.
-
21


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