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Troubleshooting Symptom Charts/Peripherals - 27
Device connected to
external modem port
does not work
1 Verify that External Modem is selected in CDEV.
2 Verify that System is 7.5.2 or later.
3 Check cables.
4 Test device with known good computer.
5 Replace logic board.
Note:
When replacing the logic board, check that the serial port
EMI clip is attached to the bottom of the CPU stiffener. If it is
missing, replace the stiffener. On international units, also
replace the stiffener if the modem EMI clip is missing. The “CPU
Stiffener” topic in Take Apart helps you locate and identify the
two EMI clips.
Note:
Perform the battery contact alignment procedure when
you replace a logic board. (See Additional Procedures, “Align
Battery Contacts.”)