Furuno RC-1500-1T - Manual (Page 389)

8-9
REF Offset Freq: Operating normally. If it does not light check
RX Synthesizer or REF OSC in the RF CON
Board. OK appears for figure less than 150.
Synthe 1st Local: Check of RF CON Board.
RX 2nd Local: Check of RF CON Board 2nd local oscilla-
tor.
Antenna Power Supply:
NG appears for discontinuity or short in cable.
Temperature*: Water temperature
Water Current*
Direction: Tidal current direction
Speed: Tidal current speed
Depth*: Depth of water
Note: * requires data from the navigation device.
Replacing Internal Battery
A lithium battery in the communication unit is used to backup system
settings. The life of this battery is about five years, however actual
life depends on usage when the battery is dead the communication
unit automatically reverts to default system settings. Contact you
dealer to request replacement of the battery.
Name: BTT(L1)
Code No.: 000-103-769
Type: CR1/2 8.L-F