Operation Manual

Simrad AP20 Autopilot
116 20220505H
NMEA (hardware) test
Access the NMEA Test from the INSTALLATION Menu (see
page 82).
NMEA Test
Loopback NMEA1 OK
Loopback NMEA2 FAILED
On the Main PCB in the junction unit disconnect the cables and
connect TX1+ to RX1+ and TX1- to RX1-. Similar on the Power
PCB connect the NMEA ports the same way; TX2+ to RX2+
and TX2– to RX2– (not available on J3000X).
Select the NMEA test menu and verify that the hardware is OK.
If not, replace the corresponding PCB(s) to rectify.
Note ! With J3XX software version V1R5 the display readout will not
automatically reset to FAILED when you remove the TX/RX
straps. You will have to turn the equipment off and back on
again to reset.