Apple Mac PowerBook 550c - Manual (Page 48)

Troubleshooting Symptom Charts/Peripheral
(Continued)
- 21
Peripheral
(Continued)
Device connected to
external modem port
doesn’t work
1 Verify that External Modem is selected in CDEV.
2 Verify that System is 7.1.1 or later.
3 Check cables.
4 Test device with known-good computer.
5 Replace daughterboard.
6 Replace motherboard.
I/O devices are
unrecognized or
garbage is
transmitted or
received
1 Verify that System is 7.1.1 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 daughterboard.
7 Replace motherboard.