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Chapter 2

510 Series Troubleshooting

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Chapter Table of Contents

Troubleshooting

Troubleshooting Flowchart

Power Supply Troubleshooting

System Board and PCB Board Troubleshooting

FDD Troubleshooting

Hard Disk Drive Troubleshooting

Keyboard Troubleshooting

Display Troubleshooting

CD-ROM Drive Troubleshooting

Internal Modem Troubleshooting

Troubleshooting

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. System (FVRSY*) Board7. Modem (FVRMD*) Board
2. PCI (FR3PL*/PS*) Board8. Floppy Disk Drive
3. Sound (FVRSD*) Board9. Hard Disk Drive
4. CardBus (FVRCD*) Board10. CD-ROM Drive

  1. LCD FPC (FVRLF*) Board

(only for 510CDS)

  1. Keyboard
  2. Display
6. DAA (FLXDA*) Board

NOTE: The DAA (FLXDA*) Board is standard equipment in Canada and the United States and an option in Europe.

The Diagnostics Disk operations are described in Chapter 3 and detailed replacement procedures are given in Chapter 4.

The following tools are necessary for implementing the troubleshooting procedures:

1. Diagnostics Disk

2. Phillips screwdriver (2 mm)

  1. Toshiba MS-DOS system disk(s)

NOTE: 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. Printer port LED

7. Printer wraparound connector

8. Serial port wraparound connector

9. PC card wraparound card

10. Multimeter

11. External monitor

12. PS/2 or compatible keyboard

13. PS/2 or compatible mouse

14. Multimedia sound system with line-in and line-out ports

15. Headphone

16. Microphone

17. Speakers with amplifier

18. External FDD attachment

Troubleshooting Flowchart

Use the flowchart in Figure 2-1 as a guide for determining which troubleshooting procedures to execute. Before going through the flowchart steps, do the following:



Figure 2-1 Troubleshooting flowchart (2/1)



Figure 2-1 Troubleshooting flowchart (2/2)

If the diagnostics program cannot detect an error, the problem may be intermittent. The Running Test program should be executed several times to isolate the problem.

Check the Log Utilities function to confirm which diagnostic test detected an error(s), then perform the appropriate troubleshooting procedures as follows:

  1. If an error is detected on the system test, memory test, display test, ASYNC test, printer test, expansion test, sound test, or real timer test, perform the system board and PCB board troubleshooting procedures in Section 2.4.
  2. If an error is detected on the floppy disk test, perform the FDD troubleshooting procedures in Section 2.5.
  3. If an error is detected on the hard disk test, perform the hard disk drive troubleshooting procedures in Section 2.6.
  4. If an error is detected on the keyboard test, perform the keyboard troubleshooting procedures in Section 2.7.
  5. If an error is detected on the display test, perform the display troubleshooting procedures in Section 2.8.
  6. If an error is detected on the CD-ROM test, perform the CD-ROM drive troubleshooting procedures in Section 2.9.
  7. If an error is detected on the modem test, perform the modem troubleshooting procedures in Section 2.10.

Power Supply Troubleshooting

The power supply controls many functions and components. To determine if the power supply is functioning properly, start with Procedure 1 and continue with the other procedures as instructed. The procedures described in this section are:

Procedure 1: Power Status Check

Procedure 2: Error Code Check

Procedure 3: Connection Check

Procedure 4: Quick Charge Check

Procedure 5: Replacement Check

Procedure 1 Power Status Check

The following icons indicate the power supply status:

Battery icon (main battery icon and second battery icon)

AC IN icon

The power supply controller displays the power supply status through the battery and the AC IN icons as shown in the tables below.

Table 2-1 Battery icon

Battery icon
Power supply status
Lights orangeQuick charge
Lights greenThe battery has a full charge and the AC cable is connected.
Blinks orange
(even intervals) 		The battery level becomes low while operating the computer on battery
power.*1
Flashes orangeThe power switch is pressed on when the battery level is low.*2
Doesn't lightAny condition other than those above.

*1 AutoResume Off will be executed soon.

*2 AutoResume Off has already been executed.

Table 2-2 AC IN icon

AC IN icon
Power supply status
Lights greenDC power is being supplied from the AC PS unit or Desk Station V Plus.
Blinks orangePower supply malfunction.*3
Doesn't lightAny condition other than those above.

*3 When the power supply controller detects a malfunction, the AC IN icon blinks and an error code is displayed.

To check the power supply status, install a battery pack and connect an AC PS unit.

Check 1If the AC IN icon flashes orange, go to Procedure 2.
Check 2If the AC IN icon does not light, go to Procedure 3.
Check 3If the battery icon does not light orange or green, go to Procedure 4.

Procedure 2 Error Code Check

If the microprocessor detects a malfunction, the AC IN icon blinks orange. The blink pattern indicates an error as shown below.

Start Off for 2 seconds

Error code (8 bit)

"1" On for one second

"0" On for half second

Interval between data bits Off for half second

An error code begins with the least significant digit.

Example: Error code 12h (Error codes are given in hexadecimal format.)

Check 1Convert the AC IN icon blink pattern into the hexadecimal error code and compare it to the tables below.

DC power is supplied through the AC PS unit or Desk Station V Plus/Enhanced Port Replicator II.

Error code
Meaning
01h
 AC PS unit output is over the maximum allowed limit.
02h
 Desk Station V Plus output is over the maximum allowed limit.
04h
 Current from the AC PS unit is over the maximum allowed limit.

Battery pack

Error code
Meaning
10h
 Main battery voltage is over the maximum allowed limit.
11h
 Main battery charge current is over the maximum allowed limit.
14h
 Secondary battery voltage is over the maximum allowed limit.
15h
 Secondary battery charge current is over the maximum allowed limit.

B5V, VCC power supply output

Error code
Meaning
20h
 B5V voltage is over the maximum allowed limit.
21h
 B5V voltage is below the minimum allowed limit.
24h
 During suspend, B5V voltage is below the minimum allowed limit.

B3V output

Error code
Meaning
30h
 B3V Voltage is over the maximum allowed limit.
31h
 B3V Voltage is below the minimum allowed limit.
33h
 B3V is below the minimum allowed limit during the suspend state.

.

B12V Output

Error code
Meaning
40h
 B12V Voltage is over the maximum allowed limit.
41h
 B12V Voltage is below the minimum allowed limit.

.

Environmental condition

Error code
Meaning
80h
 CPU temperature is outside the allowable range.
88h
 The CPU overheats, the system enters resume mode and automatically shuts down.

Check 2If error code 01h displays:

Make sure the AC power cord is firmly plugged into the AC inlet and wall outlet. If this cable is connected correctly, go to the following step:

Make sure the AC PS unit cable is firmly plugged into the DC In connector on the PCI board. If this cable is connected correctly, go to the following step:

Check 3If error code 02h displays:

Make sure the Desk Station V Plus is firmly connected to the computer's docking interface port. If this port is connected correctly, go to the following step:

Check the connector visually to make sure no pins are bent. If a pin(s) is bent, go to Chapter 4, System board Replacement Procedures. If the connector is not physically damaged, go to the following step:

Check the Desk Station V Plus for malfunctions. Refer to the Desk Station V Plus maintenance manual for details. If the error still exists, go to Procedure 5.

Check 4If error code 10h or 14h displays:

Make sure the battery pack is correctly installed in the computer. If the battery pack is correctly installed, go to the following step:

Replace the battery pack with a new one. If the error still exists, go to Procedure 5.

Check 5When 80h displays, it indicates that the CPU temperature is outside the allowable operating range. Perform the following steps:

Leave the computer in an area that is about room temperature until the CPU's internal temperature is within the allowable operating range. If the error still exists, go to Procedure 5.

Check 6When 88h is displayed, it indicates that the CPU temperature is too high. When this occurs, the computer automatically enters resume mode and shuts down.

Leave the computer off until the AC IN icon stops blinking. It is recommended that you leave the computer off until its interior reaches room temperature even though the AC IN icon stops blinking.

Check 7For any other error, go to Procedure 5.

Procedure 3 Connection Check

The power supply wiring diagram is shown below:

Any of the connectors may be disconnected. Perform Check 1.

Check 1Make sure the AC power cord is firmly plugged into the AC inlet and wall outlet. If the cable is connected correctly, go to Check 2.
Check 2If the AC IN icon does not glow green, go to Check 3.

If the Battery icon does not glow orange, go to Check 4.

Check 3Make sure the AC PS unit cable is connected correctly to the PCI board at PJ501. If the cable is connected correctly, replace the AC PS unit. If the AC IN icon does not glow green, go to Procedure 5.
Check 4Make sure the battery pack is installed in the computer correctly. If the battery is properly installed and the Battery icon does not glow orange, go to Procedure 4.

Procedure 4 Quick Charge Check

The power supply may not be charging the battery pack. Perform the following procedures:

1. Reinstall the battery pack and turn on the computer.

2. If the power does not come on, go to Procedure 5.

3. Run the Diagnostics test, select the System test, and execute subtest 06 (quick charge) as described in Chapter 3.

4. When the quick charge is complete, the Diagnostics test displays the result code. Check the result against the table below and perform any necessary check.

Result code
Contents
Check items
0
The battery is quick charging normally. Normal
1
The battery is fully charged. Normal
2
The AC PS unit is not connected. Check 2
3
The AC PS unit's output voltage is not normal. Check 1
4
The battery is not installed. Check 3
5
The battery's output voltage is not normal. Check 4
6
The battery's temperature is not normal. Check 5
7
A bad battery is installed. Check 3
8
Any other problem. Check 6

Check 1Make sure the AC power cord is firmly plugged into the AC IN socket and wall outlet. If the cable is connected correctly, replace the AC power cord.
Check 2Make sure the AC PS unit cable is connected to PJ501 on the PCI board. If the cable is connected correctly, replace the AC PS unit.
Check 3Make sure the battery is properly installed. If it is properly installed, replace it with a new one.
Check 4The battery pack is completely discharged. Wait a few minutes to recharge it. If the battery pack still doesn't charge, replace it with a new one.
Check 5The battery's temperature is hot or cold. Return the battery to a normal operating condition. If the battery pack still doesn't charge, replace it with a new one.
Check 6Go to Procedure 5.

Procedure 5 Replacement Check

The system board and PCI board may be disconnected or damaged. Disassemble the computer following the steps described in Chapter 4, Replacement Procedures, and check the connection between the PCI board and system board. If the boards are properly connected, perform the following checks:

Check 1Replace the PCI board with a new one. If the PCI board is still not functioning properly, perform Check 2.
Check 2Replace the system board with a new one.

System Board and PCB Board Troubleshooting

This section describes how to determine if the system board or other PCB board is defective or not functioning properly. Start with Procedure 1 and continue with the other procedures as instructed. The procedures described in this section are:

Procedure 1: Message Check

Procedure 2: Printer Port LED Check on Boot Mode

Procedure 3: Printer Port LED Check on Resume Mode

Procedure 4: Diagnostic Test Program Execution Check

Procedure 5: Replacement Check

Procedure 1 Message Check

When the power is turned on, the system performs the Initial Reliability Test (IRT) installed in the BIOS ROM. The IRT tests each IC on the system board and initializes it.

If an error message is shown on the display, perform Check 1.

If there is no error message, go to Procedure 2.

  • If the Toshiba MS-DOS or Windows 95 is properly loaded, go to Procedure 3.

    • Check 1If any of the following error messages displays on the screen, press the F1 key as the message instructs. These errors occur when the system configuration preserved in the RTC memory (CMOS type memory) is not the same as the actual configuration or when the data is lost.
    If you press the F1 key as the message instructs, the TSETUP screen appears to set the system configuration. If error message (b) appears often when the power is turned on, replace the RTC battery. If any other error message is displayed, perform Check 2. 

    (a)                     *** Bad HDD type ***
                Check system.  Then press [F1] key ......
(b)                     *** Bad RTC battery ***
                Check system.  Then press [F1] key ......
(c)                     *** Bad configuration ***
                Check system.  Then press [F1] key ......
(d)                     *** Bad memory size ***
                Check system.  Then press [F1] key ......
(e)                     *** Bad time function ***
                Check system.  Then press [F1] key ......
(f)                     *** Bad check sum (CMOS) ***
                Check system.  Then press [F1] key ......
(g)             *** Bad check sum (ROM) ***
                Check system.  Then press [F1] key ......

    Check 2If the following error message is displayed on the screen, press any key as the message instructs.
    WARNING:  RESUME FAILURE.

    PRESS ANY KEY TO CONTINUE.

    The error message appears when data stored in RAM under the resume function is lost because the battery has become discharged or the system board or PCI board is damaged. Go to Procedure 3.

    If any other message appears, perform Check 3.

    Check 3The IRT checks the system board. When the IRT detects an error, the system stops or an error message appears.
    If one of the following error messages (1) through (7), (9) through (17), (24) or (25) is displayed, replace the system board.
    If error message (8) is displayed, replace the PCI board.
    If error message (18) is displayed, go to the Keyboard Troubleshooting Procedures in Section 2.7.
    If error message (19), (20) or (21) is displayed, go to the HDD Troubleshooting Procedures in Section 2.6.
    If error message (22) or (23) is displayed, go to the FDD Troubleshooting Procedures in Section 2.5. 

    (1) PIT ERROR
(2) MEMORY REFRESH ERROR
(3) TIMER CH.2 OUT ERROR
(4) CMOS CHECKSUM ERROR
(5)   CMOS BAD BATTERY ERROR
(6) FIRST 64KB MEMORY ERROR
(7) FIRST 64KB MEMORY PARITY ERROR
(8) VRAM ERROR
(9) SYSTEM MEMORY ERROR
(10) SYSTEM MEMORY PARITY ERROR
(11) EXTENDED MEMORY ERROR
(12) EXTENDED MEMORY PARITY ERROR
(13) DMA PAGE REGISTER ERROR
(14) DMAC #1 ERROR
(15) DMAC #2 ERROR
(16)    PIC #1 ERROR
(17)    PIC #2 ERROR
(18)    KBC ERROR
(19)    HDC ERROR
(20)    HDD #0 ERROR
(21)    HDD #1 ERROR
(22)    NO FDD ERROR
(23)    FDC ERROR
(24)    TIMER INTERRUPT ERROR
(25)    RTC UPDATE ERROR

    Procedure 2 Printer Port LED Check on Boot Mode

    The printer port LED displays the IRT status and test status by turning lights on and off as an eight-digit binary value for boot mode. Figure 2-2 shows the printer port LED.

    Figure 2-2 Printer port LED

    To use the printer port LED follow these steps:

    1. Make sure the computer is in boot mode.

    2. Plug the printer port LED into the computer's parallel port.

    3. Turn on the computer's power.

    4. Read the LED status from left to right as you are facing the back of the computer.

    5. Convert the status from binary to hexadecimal notation.

    6. If the final LED status is FFh (normal status), go to Procedure 3.

    7. If the final LED status matches any of the test status values in Table 2-3, perform Check 1.

    NOTE: If an error condition is detected by the IRT test, the printer port LED displays an error code after the IRT test ends. For example, when the printer port LED displays 1F and halts, the IRT test has already completed the Display initialization. In this instance, the IRT indicates an error has been detected during the system memory test.

    Table 2-3 Printer port LED boot mode status (1/2)

    LED status
    Test item
    Message
    01H
    		 Special register initialization
    02H
    		 PIT testPIT ERROR
    PIT initialization-
    PIT function checkMEMORY REFRESH ERROR
    TIMER CH.2 OUT ERROR
    03H
    		 CMOS checkCMOS CHECKSUM ERROR
    CMOS BAD BATTERY ERROR
    04H
    		 Initialization of memory configuration-
    05H
    		 SM-RAM check-
    06H
    		 ROM/RAM copy-
    07H
    		 Selftest skip check-
    08H
    		 Initialization of internal VGA-
    09A
    		 System check-
    0AH
    		 First 64 KB memory testFIRST 64KB MEMORY ERROR
    FIRST 64KB MEMORY PARITY ERROR
    0BH
    		 System memory initialization-
    0CH
    		 System initialization-
    0DH
    		 Interrupt vector initialization-
    18H
    		 PIC initialization-
    1FH
    		 Display initializationVRAM ERROR
    25H
    		 System memory testSYSTEM MEMORY ERROR
    SYSTEM MEMORY PARITY ERROR
    30H
    		 Extended memory testEXTENDED MEMORY ERROR EXTENDED MEMORY PARITY ERROR
    40H
    		 DMA page register testDMA PAGE REGISTER ERROR
    41H
    		 DMAC testDMAC #X ERROR
    42H
    		 DMAC initialization-
    4AH
    		 PIC testPIC #X ERROR
    50H
    		 Mouse initialization-
    55H
    		 KBC initializationKBC ERROR
    5AH
    		 Boot password-
    60H
    		 HDD initializationHDC ERROR/HDD #0 ERROR
    65H
    		 FDD initializationFDC ERROR/NO FDD ERROR

    Table 2-3 Printer port LED boot mode status (2/2)

    LED status
    Test item
    Message
    70H
    		 Printer initialization-
    80H
    		 SIO initialization-
    90H
    		 Timer initializationRTC UPDATE ERROR
    TIMER INTERRUPT ERROR
    A0H
    		 NDP initialization-
    A6H
    		 Initialization of expansion ROM-
    C0H
    		 Password check-
    FEH
    		 Setup boot check
    *** Bad xxxx xxxx ***
    Check system. Then press [F1] key.
    FFH
    		 Boot load-

    Check 1If any of the following error codes are displayed, go to Procedure 5.

    00h, 01h, 02h, 03h, 04h, 05h, 06h, 07h, 08h, 09h, 0Ah, 0Bh, 0Ch, 0Dh, 18h, 1Fh, 25h, 30h, 40h, 41h, 42h, 4Ah, 55H, 65h, 70h, 80h, 90h, A0H, A6h, C0h, Feh

    Check 2If error code 50h is displayed, go to the Keyboard Troubleshooting procedures in Section 2.7.
    Check 3If error code 5Ah is displayed, go to the HDD Troubleshooting Procedures in Section 2.6.
    Check 4If error code 60h is displayed, go to the FDD Troubleshooting Procedures in Section 2.5.

    Procedure 3 Printer Port LED Check on Resume Mode

    The printer port LED displays the IRT status and test status by turning lights on and off as an eight-digit binary value for resume mode.

    To use the printer port LED, follow these steps:

    1. Make sure the computer is in resume mode.

    2. Plug the printer port LED into the computer's parallel port.

    3. Turn on the computer's power.

    4. Read the LED status from left to right as you face the back of the computer.

    5. Convert the status from binary to hexadecimal notation.

    6. If the final LED status is FFh (normal status), go to Procedure 4.

    7. If the final LED status matches any of the test status values in Table 2-4, perform Procedure 5.

    Table 2-4 Printer port LED resume mode error status

    Error status
    Meaning of status
    F1H
    		 System BIOS RAM checksum error
    F2H
    		 External display card is connected
    F3H
    		 HDD was installed
    F4H
    		 SMRAM checksum error or memory error during suspend
    F5H
    		 Conventional memory checksum error
    F6H
    		 Video RAM checksum error
    F7H
    		 Extended memory checksum error
    F8H
    		 PnP RAM checksum error

    Procedure 4 Diagnostic Test Program Execution Check

    Execute the following tests from the Diagnostic Test Menu. Refer to Chapter 3, Tests and Diagnostics, for more information on how to perform these tests.

    1. System test

    2. Memory test

    3. Printer test

    4. ASYNC test

    5. Real Timer test

    6. Expansion test

    7. Sound test

    8. Modem test

    If an error is detected during any of these tests, go to Procedure 5.

    Procedure 5 Replacement Check

    The system board or another PCB may be damaged. Disassemble the computer following the steps described in Chapter 4, Replacement Procedures, and perform the following checks:

    If any of the following diagnostic tests detects an error, go to Check 1.

  • System test, Memory test, Printer test, Expansion test, Async test, Real Timer test

    • If the Sound test detects an error, go to Check 2.

    If the Modem test detects an error, go to Check 5

    NOTE: Refer to Chapter 4 for instructions on how to remove and replace any of the following items.

    Check 1 Replace the system board with a new one. If the problem still exists, go to Check 6.
    Check 2 Replace the sound board with a new one. If the problem still exists, go to Check 3.
    Check 3 Replace the flat cable with a new one. If the problem still exists, go to Check 6.
    Check 4 Replace the DAA board with a new one. If the problem still exists, go to Check 5.
    Check 5 Replace the modem board with a new one. If the problem still exists, go to Check 6.
    Check 6 Replace the PCI board with a new one.

    FDD Troubleshooting

    This section describes how to determine if the FDD is functioning properly. Perform the steps below starting with Procedure 1 and continuing with the other procedures as required.

    Procedure 1: FDD Head Cleaning Check

    Procedure 2: Diagnostic Test Program Execution Check

    Procedure 3: Connector Check and Replacement Check

    Procedure 1 FDD Head Cleaning Check

    FDD head cleaning is one option available in the Diagnostic Program. Detailed operation is given in chapter 3, Tests and Diagnostics.

    Insert the diagnostics disk in the computer's floppy disk drive, turn on the computer, run the test, and then clean the FDD heads using the cleaning kit. If the FDD still does not function properly after cleaning, go to Procedure 3.

    If the test program cannot be executed on the computer, go to Procedure 3.

    Procedure 2 Diagnostic Test Program Execution Check

    Insert the diagnostics disk in the FDD, turn on the computer, and run the test. Refer to Chapter 3, Tests and Diagnostics, for more information about the diagnostics test procedures.

    Floppy disk drive test error codes and their status names are described in Table 2-5. Make sure the floppy disk in the FDD is formatted correctly and that the write protect tab is disabled. If any other errors occur while executing the FDD diagnostics test, go to Check 1.

    Table 2-5 FDD error code and status

    Code
    Status
    01h
    		 Bad command
    02h
    		 Address mark not found
    03h
    		 Write protected
    04h
    		 Record not found
    06h
    		 Media removed on dual attach card
    08h
    		 DMA overrun error
    09h
    		 DMA boundary error
    10h
    		 CRC error
    20h
    		 FDC error
    40h
    		 Seek error
    60h
    		 FDD not in drive
    80h
    		 Time out error (Not ready)
    Eeh
    		 Write buffer error
    FFh
    		 Data compare error

    Check 1If the following message is displayed, disable the write protect tab on the floppy disk.

    Write protected

    If any other message appears, perform Check 2.

    Check 2Make sure the floppy disk is formatted correctly. If it is, go to Procedure 3.

    Procedure 3 Connector Check and Replacement Check

    There are two ways to connect the FDD: through the selectable bay and through the external FDD port. If the FDD is installed in the selectable bay, begin with Check 1 below. If the FDD is connected to the external FDD port, begin with Check 3.

    Check 1Make sure the selectable bay is firmly connected to the FDD module and system board.

    If any of the connections are loose, reconnect firmly and repeat Procedure 2. If there is still an error, go to Check 2.

    Check 2The sound board may be defective or damaged. Replace the sound board. If the FDD is still not functioning properly, perform Check 4.
    Check 3Make sure the FDD cable is firmly connected to the external FDD port.

    If this cable is disconnected, connect it to the system unit and repeat Procedure 2. If the FDD is still not functioning properly, perform Check 4.
    Check 4The flexible cable may be defective or damaged. Replace the flexible cable with a new one following the steps in Chapter 4, Replacement Procedures. If the FDD is still not functioning properly, perform Check 5.
    Check 5The FDD may be defective or damaged. Replace the FDD with a new one following the steps in Chapter 4. If the FDD is still not functioning properly, perform Check 6.
    Check 6Replace the system board with a new one following the steps in Chapter 4.



    Hard Disk Drive Troubleshooting

    To determine if the hard disk drive is functioning properly, perform 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

    NOTE:

    The contents of the hard disk will be erased when the HDD troubleshooting procedures are executed. Transfer the contents of the hard disk to floppy disk or other device. If the customer has not or cannot perform the back-up, create back-up disks as listed below.

    1. If MS-DOS 6.22/Windows for Workgroups is selected, use the Master Diskette Creator (MDC) utility in the Toshiba Utility folder to back up the preinstalled software. After backing up the preinstalled software, use the BACKUP command in the Toshiba Companion Utility to back up the entire disk, including the user's files.
    1. If Windows 95 is selected, check to see if the Microsoft Create System Disks Tools (MSCSD.EXE) still exists in the System Tools Folder. (This tool can be used only once.) If it exists, use it to back up the preinstalled software, then use the Backup utility in the System Tools folder to back up the entire disk, including the user's files.

    Refer to the appropriate instructions for each operating system.

    Procedure 1 Partition Check

    Insert the Toshiba MS-DOS system disk, turn on the computer, and perform the following checks:

    Check 1Type C: and press Enter. If you cannot change to drive C, go to Check 2. If you can change to drive C, go to Procedure 2.
    Check 2Type FDISK and press Enter. Choose Display Partition Information from the FDISK menu. If drive C is listed, go to Check 3. If drive C is not listed, return to the FDISK menu and choose the option to create a DOS partition on drive C. Recheck the system. If the problem still exists, go to Procedure 2.
    Check 3If drive C is listed as active in the FDISK menu, go to Check 4. If drive C is not listed as active, return to the FDISK menu and choose the option to set the active partition for drive C. Recheck the system. If the problem still exists, go to Procedure 2.
    Check 4Remove the system disk from the FDD and cold boot the computer. If the problem still exists, go to Procedure 2. Otherwise, the HDD is operating normally.

    Procedure 2 Message Check

    When the computer's 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 appear, perform Check 5.
    HDC ERROR

    (After 5 seconds this message will disappear.)

    or 

    HDD #0 ERROR

    (After 5 seconds this message will disappear.)

      or 
HDD #1 ERROR

    (After 5 seconds this message will disappear.)

    If the above messages do not appear, perform Check 2.

    Check 2If either of the following messages appears, perform Check 3.
    Insert system disk in drive
Press any key when ready .....
  or 
Non-System disk or disk error
Replace and press any key

    If the above messages do not appear, perform Check 5.

    Check 3Check TSETUP to see whether the Hard Disk option is set to Not used. If it is set to Not used, choose another setting and repeat Check 1. If it is not set to Not used, go to Check 4.
    Check 4Using the Toshiba MS-DOS system disk, install a system program on the hard disk using the SYS command.

    If the following message appears on the display, the system program has been transferred to the HDD. Restart the computer. If the error message still appears, perform Check 5.

      System transferred
    Check 5The HDD is connected to the flexible cable and the system board. The flexible cable can become disconnected or damaged. Disassemble the computer as described in Chapter 4, Replacement Procedures. If the HDD is not firmly connected, connect it to the flexible cable and return to Procedure 1. If the HDD is firmly connected to the system board, perform Check 6.

    Check 6The HDD connector may be defective or damaged. Replace the HDD connector with a new one following the steps in Chapter 4, Replacement Procedures. If the HDD is still not functioning properly, perform Procedure 3.

    Procedure 3 Format Check

    The computer's HDD is formatted using the low level format program and the MS-DOS FORMAT program. To format the HDD, start with Check 1 below and perform the other checks as required.

    Check 1Using the Toshiba MS-DOS system disk, partition the hard disk using the FDISK command. Format the hard disk using FORMAT C:/S/U to transfer the system program to the HDD. If the following message appears on the display, the HDD is formatted. 
      Format complete

    If any other error message appears on the display, refer to the Toshiba MS-DOS Manual for more information and perform Check 2.

    Check 2Using the diagnostics disk, format the HDD with a low level format option. Refer to Chapter 3, Tests and Diagnostics, for more information about the diagnostic program.

    If the following message appears on the display, the HDD low level format is complete. Partition and format the HDD using the MS-DOS FORMAT command. 

      Format complete

    If you cannot format the HDD using the tests and diagnostics program, go to Procedure 4.

    Procedure 4 Diagnostic Test Program Execution Check

    The HDD test program is stored in the diagnostics disk. Perform all of the HDD tests in the Hard Disk Drive Test. Refer to Chapter 3, Tests and Diagnostics, for more information about the HDD test program.

    If an error is detected during the HDD test, an error code and status will display; perform Check 1. The error codes and statuses are listed in Table 2-6. If an error code is not generated, the HDD is operating properly.

    Table 2-6 Hard disk drive error codes and statuses

    Code
    Status
    01h
    		 Bad command
    02h
    		 Bad address mark
    04h
    		 Record not found
    05h
    		 HDC not reset
    07h
    		 Drive not initialized
    08h
    		 HDC overrun (DRQ)
    09h
    		 DMA boundary error
    0Ah
    		 Bad sector error
    0Bh
    		 Bad track error
    10h
    		 ECC error
    11h
    		 ECC recover enabled
    20h
    		 HDC error
    40h
    		 Seek error
    80h
    		 Time out error
    Aah
    		 Drive not ready
    BBh
    		 Undefined error
    CCh
    		 Write fault
    E0h
    		 Status error
    Eeh
    		 Access time out error
    FFh
    		 Data compare error
    Check 1Replace the HDD unit with a new one following the instructions in Chapter 4, Replacement Procedures. If the HDD is not functioning properly, perform
    Check 2.
    Check 2Replace the flexible cable with a new one following the instructions in Chapter 4.
    Check 3Replace the system board with a new one following the instructions in Chapter 4.

    Keyboard Troubleshooting

    To determine if the computer's keyboard is functioning properly, perform the following procedures. 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 1 Diagnostic Test Program Execution Check

    Execute the Keyboard Test in the Diagnostic Program. Refer to Chapter 3, Tests and Diagnostics, for more information on how to perform the test program.

    If an error occurs, go to Procedure 2. If an error does not occur, the keyboard is functioning properly.

    Procedure 2 Connector and Replacement Check

    The keyboard is connected to the sound board by a flat cable, and the sound board is connected to the system board. This cable or connector may be disconnected or damaged. Disassemble the computer as described in Chapter 4, Replacement Procedures, and perform the following checks:

    Check 1Make sure the keyboard cable is not damaged and is connected to the sound board.

  • If this cable is damaged, replace the keyboard with a new one. If the cable is disconnected, firmly connect it. Perform Procedure 1 again. If the keyboard is still not functioning properly, perform Check 2.

    • Check 2The sound board may be damaged. Replace the sound board with a new one. Refer to Chapter 4 for more information.
    Check 3The system board may be damaged. Replace the system board with a new one. Refer to Chapter 4 for more information.

    Display Troubleshooting

    This section describes how to determine if the computer's display is functioning properly. Start with Procedure 1 and continue with the other procedures as instructed.

    Procedure 1: External Monitor Check

    Procedure 2: Diagnostic Test Program Execution Check

    Procedure 3: Connector Check

    Procedure 4: Replacement Check

    Procedure 1 External Monitor Check

    Connect the external monitor to the computer's external monitor port, then boot the computer.

    If the external monitor works correctly, the internal LCD display may be damaged. Go to Procedure 3.

    If the external monitor appears to have the same problem as the internal LCD, the display controller may be damaged. Go to Procedure 2.

    Procedure 2 Diagnostic Test Program Execution Check

    The Display Test program is stored on the diagnostics disk. This program checks the display controller on the PCI board. Insert the Diagnostics disk in the computer's floppy disk drive, turn on the computer, and run the test. Refer to Chapter 3, Tests and Diagnostics, for details.

    If an error is detected, go to Procedure 3. If an error is not detected, the display is functioning properly.

    Procedure 3 Connector Check

    The display unit has an LCD module, FL, display switch, and FL inverter board. The FL and FL inverter board are connected by two cables at CN2. The LCD module and PCI board are connected by one signal cable (PJ2) as shown below. Any of these cables may be disconnected.

    Disassemble the display unit and check the following cable connections. Refer to Chapter 4. Replacement Procedures, for more information about how to disassemble the computer.

    Figure 2-3 Display connection
  • If any cable is not connected, firmly reconnect it and repeat Procedures 1 and 2. If the problem still exists, perform Procedure 4.

    • Procedure 4 Replacement Check

    The FL, FL inverter board, LCD module, and PCI board are connected to the display circuits. Any of these components may be damaged. Refer to Chapter 4, Replacement Procedures, for instructions on how to disassemble the computer and then perform the following checks:

  • If the FL does not light, perform Check 1.
  • If characters are not displayed clearly, perform Check 3.
  • If some screen functions do not operate properly, perform Check 3.
  • If the FL remains lit when the display is closed, perform Check 4.

    • Check 1Replace the FL inverter board with a new one and test the display again. If the problem still exists, perform Check 2.
    Check 2Replace the FL with a new one and test the display again. If the problem still exists, perform Check 3.
    Check 3Replace the LCD module with a new one and test the display again. If the problem still exists, perform Check 5.
    Check 4Replace the display switch with a new one and test the display again. If the problem still exists, perform Check 5.
    Check 5Replace the display cable with a new one and test the display again. If the problem still exists, perform Check 6.
    Check 6The PCI board may be damaged. Replace the PCI board with a new one.

    CD-ROM Drive Troubleshooting

    This section describes how to determine if the computer's internal CD-ROM drive is functioning properly. Perform the steps below starting with Procedure 1 and continuing with the other procedures as required.

    Procedure 1: CD Cleaning Check

    Procedure 2: Diagnostic Test Program Execution Check

    Procedure 3: Connector Check and Replacement Check

    Procedure 1 CD Cleaning Check

    1. Turn off the power.

    2. Open the CD drawer by inserting a slender object, such as a straightened paper clip, into the eject hole. The object must be long enough to activate the eject mechanism.

    3. Clean the laser pickup lens with a lens cleaner. Apply the cleaner to a cloth and wipe the lens.

    4. If the CD-ROM drive does not function properly after cleaning, go to
    Procedure 2.

    Procedure 2 Diagnostic Test Program Execution Check

    The CD-ROM drive Diagnostic test program is stored on the diagnostics disk. Insert a test CD (Toshiba-EMI Test Disc TDY-03) into the CD-ROM drive. Next, insert the diagnostics disk into the computer's floppy disk drive, turn on the computer, and run the test. Refer to Chapter 3, Tests and Diagnostics, for more information about the diagnostics test procedures.

    If any other errors occur while executing the CD-ROM drive diagnostics test, go to Procedure 3.

    Procedure 3 Connector Check and Replacement Check

    The CD-ROM drive is connected to the sound board and flexible cable by the CD-ROM drive cable. This cable may be disconnected from the sound board or the flexible cable may be damaged. Disassemble the computer following the steps listed in Chapter 4, Replacement Procedures, and perform the following checks:

    Check 1Make sure the selectable bay cable is firmly connected to the CD-ROM drive and the sound board.

    If any of the connections are loose, reconnect firmly and repeat Procedure 2. If there is still an error, go to Check 2.

    Check 2Replace the flexible cable with a new one following the steps in Chapter 4. If the CD-ROM drive is still not functioning properly, perform Check 3.
    Check 3The CD-ROM drive may be defective or damaged. Replace the CD-ROM drive with a new one following the steps in Chapter 4. If the CD-ROM drive is still not functioning properly, perform Check 4.
    Check 4Replace the sound board with a new one following the steps in Chapter 4. If the CD-ROM drive is still not functioning properly, perform Check 5.
    Check 5Replace the system board with a new one following the steps in Chapter 4.

    Internal Modem Troubleshooting

    This section describes how to determine if the internal modem is functioning properly. Perform the steps below starting with Procedure 1 and continuing with the other procedure as required.

    Procedure 1: Diagnostic Test Program Execution Check

    Procedure 2: Connector Check and Replacement Check

    Procedure 1 Diagnostic Test Program Execution Check

    The internal modem Diagnostic test program is stored on the diagnostics disk. This program checks the internal modem. Insert the diagnostics disk in the computer's floppy disk drive, turn on the computer, and run the test. Refer to Chapter 3, Tests and Diagnostics, for details.

    Check 1Execute modem subtest 1. If an error occurs, the modem board may be malfunctioning. Replace the modem board. If errors still occur, go to Check 2.
    Check 2Execute modem subtest 2. If an error occurs, the DAA module may be malfunctioning. Replace the DAA module. If errors still occur, go to Check 3.
    Check 3Execute modem subtests 3 and 4. If an error occurs, the modem board and DAA module or the speakers may be malfunctioning. Replace the modem board and the DAA module or the speakers.

    If any other errors occur while executing the internal modem diagnostics Test, go to Procedure 2.

    Procedure 2 Connector Check and Replacement Check

    The DAA board is connected to the modem board. If the modem malfunctions, there may be a bad connection between the DAA board and the modem board or between the modem board and the PCI board. Also, the DAA module, modem board, or PCI board may be damaged.

    Disassemble the computer following the steps in Chapter 4, Replacement Procedures, and perform the following checks:

    Check 1Make sure PJ1 on the DAA board is firmly connected to PJ602 on the modem board and that PJ601 on the modem board is firmly connected to PJ6 on the
    PCI board.

  • If a connector is loose, connect it to the system unit and repeat Procedure 1. If the DAA board is still not functioning properly, perform Check 2.

    • Check 2The DAA board may be defective or damaged. Replace the DAA board with a new one following the steps in Chapter 4. If the DAA board is still not functioning properly, perform Check 3.
    Check 3Replace the modem board with a new one following the steps in Chapter 4. If the DAA board is still not functioning properly, perform Check 4.
    Check 4Replace the PCI board with a new one following the steps in Chapter 4.