User Guide

340S8 Rev : A Page 75
5.19 Modem failure
Modem Failure
Check Driver install &
Telephone Line is OK?
Check IRQ, COM port
setting is OK?
AT command test
modem function is OK
Board-level trouble shooting
Replace another known good modem
DAA module.
Correct it
Correct it
Re-install Drivers
Connect it
No
Yes
No
No
Yes
Check modem DAA board is
connected properly and
wiring with the phone jack
No
Yes