(continued)
009 (continued)
Note: If the phone lines attached to the modem have
experienced a high voltage surge (struck by lightning, for
example), first replace the modem and go to Step 001
on page 2-62.
Replace the system board.
010
The modem is functioning correctly.
011
– If the audio tones are incorrect, replace the modem.
– Power-off the system unit.
– Plug the modem adapter card into a different riser card slot.
– Power-on the system unit.
– Run the modem adapter tests.
DID THE SYMPTOM REMAIN?
Yes No
012
Replace the riser card.
013
DOES THE SYSTEM UNIT WORK NORMALLY EXCEPT FOR THE
MODEM?
Yes No
014
Go to “Start” on page 2-2.
015
– Power-off the system unit.
– Remove the modem adapter card from the riser card.
– Reconnect (reseat) the riser card.
– Power-on the system unit.
– Check the voltages at pins B3, B5, B7, and B9 on the top of the riser
card.
B3 = +5 V dc
B5 = −5 V dc
2-64
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