Furuno COLOR VIDEO PLOTTER 1833C Operator's Manual page 222

7. MAINTENANCE, TROUBLESHOOTING
Network sounder test (Requires Network Sounder ETR-6/10N)
Press the NETWORK SOUNDER TEST soft key at the MEMORY I/O TEST
menu to test the Network Sounder ETR-6/10N. The equipment displays network
sounder program version number, checks the ROM and RAM, and displays
water temperature (appropriate sensor required) and depth. The results of the
ROM and RAM check are shown as OK or NG (No Good). For any NG, request
service. Press the RETURN soft key to return to the MEMORY I/O TEST menu.
ARP test (Requires ARP pcb in Model 1800/1900 series network radar)
The ARP test is mainly provided for the service technician. Press the ARP TEST
soft key at the MEMORY I/O TEST menu to test the ARP. The results of the
ROM and RAM check are shown as OK or NG (No Good). For any NG, request
service. Press the RETURN soft key to return the MEMORY I/O TEST menu.
7-8
XX = Program Version No.
Network sounder test results
XX = Program Version No.
ARP test results