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2 Troubleshooting Procedures
NB250/NB255 Series Maintenance Manual
3
2.1 Troubleshooting Introduction
Chapter 2 describes how to determine if a Field Replaceable Unit (FRU) in the computer is
causing the computer to malfunction. The FRUs covered are:
1. Display 7. Wireless LAN 13. External ODD
2. HDD/SSD 8. Camera 14. Bridge media
3. Keyboard 9. Bluetooth(10BL no support) 15. 3D sensor(10BL no support)
4. USB ports 10. Headphone 16. Sleep charge(10BL no support)
5. Touchpad 11.MIC
6. Speaker 12. 3G module(10BL no support)
The Diagnostics Disk operations are described in Chapter 3. Detailed replacement
procedures are given in Chapter 4.
The following tools are necessary for implementing the troubleshooting procedures:
1. Phillips screwdriver (2 mm)
2. 6mm nut driver (for the helix screw nuts on the rear ports for RAM door)
3. 2DD or 2HD formatted work disk for floppy disk drive testing
4. Torx screw driver with type T6 bit for HDD door
5. USB memory disk
6. Multimeter
7. External monitor\ODD
8. USB compatible keyboard
9. Multimedia sound system with line-in and line-out ports
10. Headphones
11. USB test module and USB cable
12. MIC line
2.2 Troubleshooting Flowchart
If you know the location of the malfunction, turn directly to the appropriate section of this
chapter. If the problem is unspecified, use the flowchart in Figure 2-1 as a guide for
determining which troubleshooting procedures to execute. Before performing any
troubleshooting procedures, verify the following:
Ask the user if a password is registered, if it is, ask him or her to enter the password.
Verify with the customer that Toshiba Windows XP/Vista/Linux is installed on the hard
disk. Operating systems that were not preinstalled by Toshiba can cause the computer to
malfunction.