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Troubleshooting Symptom Charts/Peripherals - 28
I/O devices are
unrecognized or
garbage is
transmitted or
received
1 Verify that System is 7.5.2 or later.
2 Check cables
3 Verify that SCSI device is correctly terminated.
4 Verify that SCSI select switch setting on external device is
unique.
5 Test device with known-good computer.
6 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.”)