2 Troubleshooting Procedures 2.1 Troubleshooting
PORTEGE M300 Maintenance Manual (960-504) 2-1
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2.1 Troubleshooting Chapter 2 describes how to determine which Field Replaceable Unit (FRU) in the computer
is causing the computer to malfunction. (The “FRU” means the replaceable unit in the field.)
The FRUs covered are:
1. Power supply 6. Touch pad 11. Wireless LAN
2. System Board 7. Display 12. Bluetooth
3. USB FDD 8. Optical Drive 13. Sound
4. 2.5” HDD 9. Modem
5. Keyboard 10. LAN
The Test Program operations are described in Chapter 3. Detailed replacement procedures are
described in Chapter 4.
NOTE: 1. When replacing the system board, make sure to follow the procedures below.
(1) Execute the subtest03 DMI information save of 3.3 Setting of the hardware
configuration in Chapter 3 in order to save DMI data from the old system board
to Floppy disk.
(2) Copy the DMI data to a new system board by executing the subtest04 DMI
information recovery and subtest08 System configuration display.
The implement for the Diagnostics procedures is referred to Chapter 3. Also, following
implements are necessary:
1. Phillips screwdrivers (For replacement procedures)
2. Implements for debugging port check
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Toshiba MS-DOS system FD
RS-232C cross cable
Test board with debug port test cable
PC for displaying debug port test result