Toshiba Libretto 50CT/70CT Manual

2.5  Floppy Disk Drive (FDD) Troubleshooting2  Troubleshooting Procedures2-18Libretto 50CT/70CT Maintenance ManualEEhWrite buffer error 

2  Troubleshooting Procedures2.5  Floppy Disk Drive (FDD) TroubleshootingLibretto 50CT/70CT Maintenance Manual2-19Check 1If the following message is displayed, disable the write protect tab on the floppy
disk.  If any other message displays, perform Check 2.
Write protected
Check 2Make sure the floppy disk is formatted correctly.  If it is, go to Procedure 3.
Procedure 3Connector Check and Replacement CheckThe FDD, cable, and PC card is a single unit. Install the PC card in the computer, then begin
with...

2.6  Hard Disk Drive (HDD) Troubleshooting2  Troubleshooting Procedures2-20Libretto 50CT/70CT Maintenance Manual2.6 Hard Disk Drive (HDD) Troubleshooting
To determine if the hard disk drive is functioning properly, do the procedures below starting
with Procedure 1.  Continue with the other procedures as instructed.
Procedure 1:Partition Check
Procedure 2:Message Check
Procedure 3:Format Check
Procedure 4:Diagnostic Test Program Execution Check
NOTES:  1.  The contents of the hard disk will be erased when...

2  Troubleshooting Procedures2.6  Hard Disk Drive (HDD) TroubleshootingLibretto 50CT/70CT Maintenance Manual2-21Procedure 2Message Check
When the HDD does not function properly, some of the following error messages may appear
on the display.  Start with Check 1 below and perform the other checks as instructed.
Check 1If any of the following messages display, go to Check 5.  If not, go to Check 2:HDD ERROR
or
HDD #x ERROR
(After 5 seconds this message will disappear.)Check 2If either of the following...

2.6  Hard Disk Drive (HDD) Troubleshooting2  Troubleshooting Procedures2-22Libretto 50CT/70CT Maintenance ManualCheck 2Use the Toshiba MS-DOS system disk to partition the hard disk, using the FDISK
command.
Check 3Using the Diagnostic Disk, format the HDD with a low level format option.  Refer
to Chapter 3, Tests and Diagnostics for more information about the diagnostics
program.
If the following message displays, the HDD low level format is complete.
Partition and format the HDD using the MS-DOS FORMAT...

2  Troubleshooting Procedures2.6  Hard Disk Drive (HDD) TroubleshootingLibretto 50CT/70CT Maintenance Manual2-23Table 2-6  Hard disk drive error codes and statuses
CodeStatus01hBad command02hBad address mark03hWrite Protected04hRecord not found06hHDC not reset08hDMA overrun error09hDMA boundary error10hCRC error20hFDC error40hSeek error60hFD not in drive80hTime out errorEEhWrite Buffer errorFFhData compare errorCheck 1Replace the HDD unit with a new one following the instructions in Chapter 4,...

2  Troubleshooting Procedures2.7  Keyboard TroubleshootingLibretto 50CT/70CT Maintenance Manual2-232 
2.7 Keyboard Troubleshooting
This section describes how to determine if the keyboard is functioning properly.  To
troubleshoot the keyboard, start with Procedure 1 and continue with the other procedure as
instructed.
The procedures described in this section are:
Procedure 1:Diagnostic Test Program Execution Check
Procedure 2:Connector and Replacement Check
Procedure 1Diagnostic Test Program Execution...

2.8  Pointing Device Troubleshooting2  Troubleshooting Procedures2-24Libretto 50CT/70CT Maintenance Manual2.8 Pointing Device Troubleshooting
This section describes how to determine if the pointing device is functioning properly. To
troubleshoot the pointing device, start with procedure 1 and continue with the other
procedure as instructed.
Procedure 1:Diagnostic Test Program Execution Check
Procedure 2:Connector and  Replacement Check
Procedure 1Diagnostic Test Program Execution Check
Execute the...

2  Troubleshooting Procedures2.9  Display TroubleshootingLibretto 50CT/70CT Maintenance Manual2-252.9 Display Troubleshooting
This section describes how to determine if the display is functioning properly.  Start with
Procedure 1 and continue with other procedures as instructed.
Procedure 1:Diagnostic Test Program Execution Check
Procedure 2:Connector Check
Procedure 3:Replacement Check
Procedure 1Diagnostic Test Program Execution Check
The Display Test program is stored on the Diagnostics Disk.  This...

2.9  Display Troubleshooting2  Troubleshooting Procedures2-26Libretto 50CT/70CT Maintenance ManualCheck 2Replace the LCD module with a new one and test the display again. If the problem
still exists, go to Check 3.
Check 3Replace the FL inverter board with a new one and test the display again. If the
problem still exists, go to Check 4.
Check 4Replace the FL with a new one and test the display again. If the problem still
exists, go to Check 5.
Check 5The system board may be damaged. Replace the system...