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2 Troubleshooting Procedures 2.5 USB FDD Troubleshooting
Procedure 3 Connector Check and Replacement Check
USB FDD is connected to USB port on system board and US board. US board is also
connected to system board by cable. The connection of cable and board may be defective.
Otherwise, they may be faulty. Disassemble the computer following the steps described in
Chapter 4, Replacement Procedures and perform the following checks.
USB FDD can be connected to the following 4 ports.
(System board x 2 ports, SJ board x 2 ports)
<System board>
CN4610
USB FDD
<SJ board>
CN4620
CN4612
CN4611
CN4622
USB harness
Check 1 Make sure USB FDD is firmly connected to USB port. If the connection is loose,
connect firmly and repeat Procedure 2. If the problem still occurs, go to Check 2.
NOTE: When checking the connection, be sure to check it with care for the followings.
1. Cable can not be disconnected from the connector.
2. Cable is connected straight to the connector.
3. Cable is connected all the way seated in the connector.
4. Cable can not be broken.
QOSMIO G20 Maintenance Manual (960-511) [CONFIDENTIAL]
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