Maintenance Manual (960-943) 2-12
Troubleshooting Procedures
2.5.1 Procedure 1 The test program reading check for maintenance by a
USB unit
2.5.2 Procedure 2 Connector Check and Replacement Check
2.5.1 Procedure 1 The test program reading check for maintenance
by a USB unit
USB connector and the test program for maintenance is read. If the test
program cannot be executedon the computer, go to Procedure 2.
2.5.2 Procedure 2 Connector Check and Replacement Check
USB unit is connected to USB port System board. The connection of the
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.
Figure 2-4 Connection Check
Check 1
Make sure USB unit is firmly connected to USB port. If the connection is
loose, connect firmly and repeat Procedure 1. If the problem still occurs, go
to Check 2
Check 2
Connect USB unit to other USB port and check if it works properly. If it does
not work properly, perform Check 3
Check 3
USB unit may be faulty. Replace it with a new one. If the problem still
occurs, perform Check 4
Check 4
System board may be faulty. Replace it with a new one following the steps
in Chapter 4, Replacement Procedures.
USB unit
<System board>
CN4800
CN4821
Type-C connector 1
Type-C connector 2
CN4850
Type-A connector 1
When checking the connection, be sure to check it with care for the
followings.
1. USB unit can not be disconnected from the connector.
2. USB unit is connected straight to the connector.
3. USB unit is connected all the way seated in the connector.
4. USB unit or connector can not be broken.
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