420 Series 2-1
2.1 Troubleshooting
Chapter 2 describes how to determine if a Field Replaceable Unit (FRU) in the 420 series is
causing the computer to malfunction. The FRUs covered are:
1. System Board(s)
2. Sound Board
3. VGA Board
4. Floppy Disk Drive
5. Hard Disk Drive
6. CD-ROM Drive
7. Keyboard
8. Display
9. Power Supply
The Diagnostics Disk operations are described in Chapter 3 and detailed replacement proce-
dures are given in Chapter 4.
The following tools are necessary for implementing the troubleshooting procedures:
1. Diagnostics Disk
2. Phillips screwdriver (2 mm)
3. Toshiba MS-DOS system disk(s)
(You must install the following onto the disk: SYS.COM, FORMAT.COM,
FDISK.COM and FDISK.EXE)
4. 2DD or 2HD formatted work disk for floppy disk drive testing
5. Cleaning kit for floppy disk drive troubleshooting
6. RS-232-C wraparound connector
7. Printer wraparound connector
8. Multimeter
9. External CRT
10. PS/2 or compatible keyboard
11. PS/2 or compatible mouse
12. Serial port wraparound connector
13. PC card wraparound card
14. Multimedia sound system with line-in and line-out ports
15. Headphone
16. CD-ROM drive
17. Toshiba EMI test disk TDY-03
18. Music CD
19. Lens cleaner for CD ROM laser pickup lens
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