Maintenance Manual (960-942) 2-12
Troubleshooting Procedures
2.5.2 Procedure 2 Connector Check and Replacement Check
USB unit is connected to USB ports on USB board and 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.
If the error is detected on Type-A connector, go to Check 1. If the error is
detected on Type-C connector, go to Check 5.
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
USB board or FPC (FSAPYN*) may be faulty. Replace it with a new one
following the steps in Chapter 4, Replacement Procedures. If the problem
still occurs, perform Check 5.
Check 5
USB unit
<System board>
<USB board>
CN4800
CN4821
CN4860
CN9801
CN9602
Type-C connector 1
Type-C connector 2
Type-A connector 2
FPC
(FSAPYN*)
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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