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28 - PowerBook G4 (15-inch FW 800_1.5/1.33GHz) Troubleshooting
Hardware Symptom Charts
Modem intermittently disconnects or low performance
1. Verify known-good RJ-11 telephone cable (for example, the retaining clip is not broken
off) and it is firmly installed when used. If telephone cable is bad, replace it.
2. Ask if issue happens with only one particular phone line, but not another. The problem
may be an issue with that particular phone line. Under bad line condition, try setting
the modem script to start with a slower connect rate such as “Apple Internal 56K
Modem (v.34).”
3. If the customer indicates the system disconnects under very high CPU loads such as
burning DVDs and/or working with video editing software such as Final Cut Pro, try
connecting the modem without any application running and see how the modem
performs. Use Knowledge Base article 106642: “Mac OS X: Using Apple PPP Test
Server” to test the modem. If OK, ask the customer if the task of connecting the
modem can be done separately or with less applications running simultaneously.
4. Check RJ-11 wires to modem board. Replace the RJ-11 cable assembly if there is
signs of damage.
5. Check modem flex cable is properly installed between the modem card and main logic
board. Replace cable if needed.
6. Replace modem card.
7. Replace the logic board.