2 Troubleshooting Procedures 2.3 Power Supply Troubleshooting
PORTEGE M300 Maintenance Manual (960-504) 2-17
Procedure 5 Replacement Check
The system board, DC-IN harness or AC adapter may be disconnected or damaged. Replace
the system board or AC adapter with a new one following the steps described in Chapter 4,
Replacement Procedures.
When AC adapter is connected ;
Check 1 AC adapter may be faulty. Replace the AC adapter with a new one. If the problem
still occurs, perform Check 2.
Check 2 DC-IN harness may be faulty. Replace the DC-IN harness with a new one. If the
problem still occurs, perform Check 3.
Check 3 System board may be faulty. Replace the system board with a new one.
When AC adapter is not connected ;
(When driving with battery pack)
Check 1 Battery pack may be faulty. Replace it with a new one. If the problem still occurs,
perform Check 2.
Check 2 System board may be faulty. Replace the system board with a new one.