Furuno GP-90 - Safety Instructions; General Safety Precautions

Contents
1. Circuit Description
1.1 Antenna Unit............................................................................1
1.2 Display Unit.............................................................................1
1.3 LCD Driver Signal...................................................................4
1.4 GP-90 - DUAL ........................................................................4
2. Location of Parts .............................................................5
3. Maintenance
3.1 Adjustment...............................................................................6
3.2 Jumper Setting.........................................................................7
3.3 Battery Replacement................................................................8
4. Troubleshooting
4.1 Error Messages......................................................................10
4.2 LED Status.............................................................................10
4.3 Selftest...................................................................................10
4.4 Troubleshooting Flow Chart..................................................13
5. Communication with PC
5.1 Connection.............................................................................19
5.2 Setting....................................................................................19
5.3 DATA Transfer ......................................................................19
5.4 Data Format...........................................................................20
6. Program Upgradation
6.1 Using PC................................................................................23
6.2 Using MT-08 .........................................................................24
6.3 DIP Switch Setting ................................................................24
6.4 Procedure...............................................................................25
Schematic Diagrams ...............................................................S-1