I had exact same problem as ProjectX reported except that my Ring to Tip voltage was 13.2V. My troubleshooting results are provided below. Is this sufficient to verify a board problem before I go to the trouble and down-time of returning the board for repair? BTW, I'm almost certain that mine was lightning related. This is the ONLY problem detected with the M1G but I had a gate controller fried as well as a couple of Insteon devices (all on different distribution panel but from same mains transformer.
Thanks,
jim
Test 1:
o RJ45 connector at RJ31X CONNECTED
o Global- Local and remote control ENABLED
o Telco Seized light ON
o LCD keypad user menu 8,6,4 Last onhook voltage= 0.0V
o RJ31X: Voltage across #4 & #5 = 46.5V
o RJ31X: Voltage across #1 & #8 = 13.2V
Test 2:
o RJ45 connector at RJ31X DISCONNECTED
o Global- Local and remote control ENABLED
o Telco Seized light ON
o LCD keypad user menu 8,6,4 Last onhook voltage= 0.0V
o Voltage across #4 & #5 = 46.5V
o Voltage across #1 & #8 = 46.5V
Test 3:
o Outside Telephone line connected directly to Tip and Ring on M1
o House phone connected directly to R1 and T1
o Global- Local and remote control ENABLED
o Telco Seized light remained ON before, during, after phone hookup
o No dial tone on phone
o Voltage across R1 and T1 = 13.2V