Battery Replacement - Furuno GP-90 Service Manual

Output of log pulse signal
MNEA0183 signal is output from DATA 3 port with factory - default setting. Put short jumpers on JP5
instead of JP4 to output log pulse from DATA 3 post.
ON/OFF
NP Board

3.3 Battery Replacement

The battery is replaced with new one by following of the steps below.
1. Disconnect JP1 on NP board. See Fig. 3.3.
2. Use a desoldering tool to remove the battery from NP board.
3. Solder the replacement battery onto the board.
4. Fix the battery onto the board with silicone sealant.
5. Solder JP1.
(1) Replace the battery only with CR2450 - F2 ST2L (000-144-941).
(2) Never short + and - sides of the cell.
(3) The lithium cell may explode resulting in a fire or chemical burn if mistreated. Do not
recharge, disassemble, or incinerate.
(4) Follow local ordinances or regulations for the disposal.
Table 3.3 Setting of JP4 and JP5
Jumper
JP4 (2pcs.)
JP5 (3pcs.)
Max. 500 mA, 50 VDC
MOS
FET
Relay
U38
G3VM-61E
Fig.3.4 Connection of load to MOS FET relay
NMEA0183
Connected
Removed
DATA 3
6
1 Load
5
2
4
(Observe the polarity
when connecting DC power supply.)
CAUTION
8
3. Maintenance
Log pulse
Removed
Connected