Self-Test - Furuno FELCOM 12 Service Manual

6.1 Self-Test

The self-test is carried out at every power-up, however you can diagnose the
communication unit by using the self-test menu at any time.
1. Self-test at Power-up
The communication unit is checked for proper operation each time the power is turned on.
The conducted tests are;
(1) ROM sum test
(2) RAM read and write test
(3) DP RAM read and write test
(4) EE PROM sum test
(5) VITERBI decoder test
At the completion of each test, a short beep is released. If an error is detected, a long keep
is released and CR3 or CR5 on the CPU board will light with the following message(s).
The self-test proceeds until the end of the sequence even if any error is detected. The
CPU board must be replaced when an error message appears.
Error Indications
• TROUBLE:CPU1 ROM NG.
• TROUBLE:CPU2 ROM NG.
• TROUBLE:CPU1 RAM NG.
• TROUBLE:CPU2 RAM1 NG.
• TROUBLE:CPU2 RAM2 NG.
• TROUBLE:CPU1 DP RAM NG.
• TROUBLE:CPU2 DP RAM NG.
• TROUBLE:CPU1 VITERBI NG.
• TROUBLE:CPU2 EEPROM NG.
Note) Very important!
EE-PROM (U11) contains Forward and Return ID. When ordering the EE-
PROM, ship's name and serial number must be written down.
Chapter 6 Troubleshooting
6-1