Modem Failure - Uniwill 340S8 Service Manual

5.19 Modem failure

340S8
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
Check modem DAA board is
connected properly and
wiring with the phone jack
Yes
Replace another known good modem
DAA module.
Yes
Yes
Rev : A
No
Correct it
No
Correct it
No
Re-install Drivers
No
Connect it
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