Furuno FELCOM251 - Page 172

7. MAINTENANCE AND TROUBLESHOOTING
7-8
11. Put the IP Handset on the hook, then confirm that the "On the hook" indication ap-
pears in white text.
To skip the hook test, press the key. Note that the result of the hook test is
"NG".
12. Put the IP Handset off the hook, then confirm that the "Off the hook" indication ap-
pears in white text.
To skip the hook test, press the key. Note that the result of the hook test is
"NG".
13. Press the Enter key to go to the temperature sensor test.
The temperature sensor test checks the two temperature sensors in the IP Hand-
set.
The temperature data on the screen is updated in every ten seconds.