Toshiba Libretto 50CT User Manual Download Page 47

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2.4 System Board Troubleshooting

2 Troubleshooting Procedures

2-14

Libretto 50CT/70CT Maintenance Manual

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

LED status

Test item

Message

42H

DMAC initialization

—

4AH

PIC test

PIC #X ERROR

Mouse initialization

—

55H

KBC initialization

KBC ERROR

60H

HDD initialization

HDC ERROR/HDD #0 ERROR

65H

FDD initialization

FDC ERROR/NO FDD ERROR

70H

Printer initialization

—

80H

SIO initialization

—

90H

Timer initialization

RTC 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.

Boot load

—

Check 1

If the following error codes display, go to Procedure 5.

00h, 02h, 03h, 04h, 05h, 06h, 07h, 08h, 0Ah, 0Bh, 0Ch, 0Dh,18h,

1Fh, 25h, 30h, 40h, 41h, 42h, 55h, 65h, 70h, 80h, 90h, A0h, A6h

Check 2

If error code 4AH displays, go to the Keyboard Troubleshooting procedures in
Section 2.7

Check 3

If error code 55H displays, go to the HDD Troubleshooting Procedures in Section
2.6.

Check 4

If error code 60H displays, go to the FDD Troubleshooting Procedures in Section
2.5.

Procedure 3

Printer Port LED Check in Hibernation 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 Hibernation mode.

Summary of Contents for Libretto 50CT

Page 1: ...indirectly from errors omissions or discrepancies in connection with the furnishing performance or use of this material Trademarks IBM is a registered trademark and PC AT PS 2 OS 2 and VGA are trademarks of IBM Corporation MS DOS and Windows are registered trademarks of Microsoft Corporation Intel and Pentium are registered trademarks and MMX is a trademark of Intel Corporation Lotus is a register...

Page 2: ... safety instruction is not observed WARNING Warning indicates the existence of a hazard that could result in bodily injury if the safety instruction is not observed CAUTION Caution indicates the existence of a hazard that could result in property damage if the safety instruction is not observed NOTE A Note contains general information that relates to safe maintenance services Improper repair of th...

Page 3: ...s how to diagnose and resolve FRU problems Chapter 3 Tests and Diagnostics describes how to perform test and diagnostic operations for maintenance service Chapter 4 Replacement Procedures describes the removal and replacement of the FRUs Appendices The appendices describe the following Handling the LCD module Board layout Pin assignments Key layout Wiring diagrams BIOS Rewrite Procedures Reliabili...

Page 4: ...the keyboard is printed in boldface type Key operation Some operations require you to simultaneously use two or more keys We identify such operations by the keytop symbols separated by a plus sign For example Ctrl Pause Break means you must hold down Ctrl and at the same time press Pause Break If three keys are used hold down the first two and at the same time press the third User input Text that ...

Page 5: ...leshooting Flowchart 2 2 2 3 Power Supply Troubleshooting 2 5 2 4 System Board Troubleshooting 2 10 2 5 Floppy Disk Drive FDD Troubleshooting 2 17 2 6 Hard Disk Drive HDD Troubleshooting 2 19 2 7 Keyboard Troubleshooting 2 23 2 8 Pointing Device Troubleshooting 2 24 2 9 Display Troubleshooting 2 25 Chapter 3 Tests and Diagnostics 3 1 The Diagnostic Test 3 1 3 2 Executing the Diagnostic Test 3 3 3 ...

Page 6: ... Utilities 3 42 3 21 Running Test 3 44 3 22 Floppy Disk Drive Utilities 3 45 3 23 System Configuration 3 49 3 24 SETUP 3 50 Chapter 4 Replacement Procedures 4 1 Overview 4 1 4 2 Battery Pack 4 6 4 3 Optional PC Card 4 8 4 4 Hard Disk Drive HDD 4 10 4 5 Optional Memory Module 4 12 4 6 Keyboard 4 14 4 7 Display Assembly 4 16 4 8 RTC Battery 4 19 4 9 System Board 4 20 4 10 Display Mask 4 21 4 11 FL I...

Page 7: ... Adapter Board 4 33 Appendices Appendix A Handling the LCD Module A 1 Appendix B Board Layout B 1 Appendix C Pin Assignments C 1 Appendix D Key Layouts D 1 Appendix E Wiring Diagrams E 1 Appendix F BIOS Rewrite Procedures F 1 Appendix G Reliability G 1 ...

Page 8: ...viii Libretto 50CT 70CT Maintenance Manual ...

Page 9: ...TOSHIBA Toshiba America Information Systems Inc ComputerSystemsDivision 9740 Irvine Boulevard Irvine CA 92618 ...

Page 10: ...Chapter 1 Hardware Overview ...

Page 11: ...1 ii Libretto 50CT 70CT Maintenance Manual ...

Page 12: ...1 13 1 8 1 Main Battery Pack 1 13 1 8 2 Battery Icon 1 13 1 8 3 Battery Charging Control 1 13 1 8 4 RTC battery 1 14 Figures Figure 1 1 Front of the computer 1 3 Figure 1 2 System unit configuration 1 3 Figure 1 3 System unit block diagram 1 4 Figure 1 4 3 5 inch FDD 1 7 Figure 1 5 2 5 inch HDD 1 8 Figure 1 6 Keyboard 1 9 Figure 1 7 LCD module 1 10 Tables Table 1 1 FDD specifications 1 7 Table 1 2...

Page 13: ...al Table 1 5 FL inverter board specifications 1 11 Table 1 6 Power supply board output rating 1 12 Table 1 7 Battery specifications 1 13 Table 1 8 Time required for quick charge 1 14 Table 1 9 RTC battery charging data preservation time 1 14 ...

Page 14: ... Drive HDD The Libretto 50CT has a 2 5 inch HDD with a capacity of 815MB The Libretto 70CT has a 2 5 inch HDD with a capacity of 1 58GB q Display A 6 1 inch Thin Film Transistor TFT color Liquid Crystal Display LCD that enables a display of up to 16M colors at a resolution of 640 x 480 pixels A video controller and 1MB of VRAM enable an external monitor to display 16M colors at a resolution of 128...

Page 15: ...rface port A 132 pin docking interface port enables connection of the I O port adapter or an optional Enhanced Port Replicator The Enhanced Port Replicator has one additional PC card slot that accommodates a 10 5mm card Type III and duplicates the ports available on the I O adapter in addition to the connection of the PS 2 compatible mouse and keyboard q AccuPoint The pointer control stick located...

Page 16: ...1 Features Libretto 50CT 70CT Maintenance Manual 1 3 The front of the computer is shown in Figure 1 1 Figure 1 1 Front of the computer The system unit configuration is shown in Figure 1 2 Figure 1 2 System unit configuration ...

Page 17: ... System Unit Block Diagram 1 Hardware Overview 1 4 Libretto 50CT 70CT Maintenance Manual 1 2 System Unit Block Diagram Figure 1 3 is a block diagram of the system unit Figure 1 3 System unit block diagram ...

Page 18: ... chips 3 3 volt operation No parity bit Access time 70 ns Data transfer is 64 bit width q BIOS ROM Flash EEPROM 256 KB one 256K x 8 bit chip 64 KB are used for system BIOS 40 KB are used for VGA BIOS 152 KB are reserved Access time 120 ns Data transfer is 8 bit width q Expansion memory One expansion memory slot is available for 8 and 16 MB memory kits which consist of 1M x 16 bit EDO DRAM chips 3 ...

Page 19: ...ntrol Power supply microprocessor interface PnP support CPU control SMI control Clock speed control Memory control 64 bit memory bus control Video local bus control 64 to 32 bit 32 to 64 bit data bus interface Address latch control Address conversion Address latch Hibernation control Ring wake up control PC card control Memory card control I O card control BIOS ROM interface Infrared port control ...

Page 20: ...ides simultaneous control of both an AccuPoint and a PS 2 mouse q Sound Controller The Libretto 50CT uses one OPL3 SA2 that incorporates OPL3 FM synthesizer Digital Analog Converter DAC and MPU401 MIDI interface The Libretto 70CT uses one OPL3 SA3 that incorporates OPL3 FM synthesizer Digital Analog Converter DAC and MPU401 MIDI interface ...

Page 21: ...rd slot The FDD is shown in Figure 1 4 Figure 1 4 3 5 inch FDD The specifications for the FDD are listed in Table 1 1 Table 1 1 FDD specifications Item 2MB mode 1MB mode Storage capacity KB Unformatted Formatted 2 000 1 440 1 000 720 Number of heads 2 2 Number of cylinders 80 80 Access time ms Track to track Average Head settling time 3 181 15 3 181 15 Recording track density tpi 135 135 Data tran...

Page 22: ...e removable HDD is a random access non volatile storage device It has a non removable 2 5 inch magnetic disk and mini winchester type magnetic heads The Libretto 50CT computer supports a 815MB HDD The Libretto 70CT computer supports a 1 58GB HDD The HDD is shown in Figure 1 5 Figure 1 5 2 5 inch HDD ...

Page 23: ...cations Libretto 50CT 815MB HDD Item Specifications Formatted capacity MB 815 Number of disks 1 Logical heads 2 Bytes per sector 512 Rotation speed rpm 4 000 Recording method 8 9 RLL Libretto 70CT 815MB HDD Item Specifications Formatted capacity GB 1 58 Number of disks 1 Logical heads 2 Bytes per sector 512 Rotation speed rpm 4 000 Recording method 8 9 RLL ...

Page 24: ...n flat cable The AccuPoint located on the right of the display panel provides convenient control of the cursor without requiring desk space for a mouse The keyboard is shown in Figure 1 6 See Appendix D for optional keyboard configurations Figure 1 6 Keyboard The specifications for the keyboard are listed in Table 1 3 Table 1 3 Keyboard specifications Item Specifications Input method Pantograph Fu...

Page 25: ...0 x 480 pixels The LCD module is shown in Figure 1 7 Figure 1 7 LCD module The specifications for the LCD are listed in Table 1 4 Table 1 4 LCD specifications Item Specifications Number of Pixels pixels 640x480 Dot pitch mm 0 192x0 192 Display area mm 122 8 H x92 16 V Contrast 100 1 FL current mA 4 6 4 0 2 8 2 4 Bright Semi bright NOTE The FL currents at power on are Bright Semi bright Universal A...

Page 26: ...nt Lamp The specifications for the FL inverter are listed in Table 1 5 Table 1 5 FL inverter board specifications Item Specifications Input Voltage V 5 Power W 2 2 Output Voltage Vrms 800 Current mA 4 6 4 0 2 8 2 4 Bright Semi bright NOTE The FL currents at power on are Bright Semi bright Universal AC Adapter connected 4 6 mA 2 8 mA Universal AC Adapter not connected 4 0 mA 2 4 mA ...

Page 27: ... is connected to the computer 2 Detects DC output and circuit malfunctions 3 Controls the LED icon and the speaker 4 Detects a fully charged Main Battery Pack 5 Controls power on off 6 Provides more accurate detection of a low Main Battery Pack 7 Calculates the remaining Main Battery Pack capacity The power supply output rating is specified in Table 1 6 Table 1 6 Power supply board output rating D...

Page 28: ...bernation mode 1 8 2 Battery Icon The icon color shows the status of the removable battery pack Each color indicates Orange The battery is being charged Universal AC Adapter connected Green The battery is full charged Universal AC Adapter connected Blinking orange The battery is low when the power is on No light Under any other conditions the LED does not light 1 8 3 Battery Charging Control A pow...

Page 29: ...ckle Battery Charge The Main Battery Pack will trickle charge when the Universal AC Adapter is connected and the system is on or when the main battery pack becomes fully charged The microprocessor automatically changes quick charge to trickle charge 1 8 4 RTC battery The RTC battery provides power to keep the current date time and other setup information in memory while the computer is turned off ...

Page 30: ...Chapter 2 Troubleshooting Procedures ...

Page 31: ...2 ii Libretto 50CT 70CT Maintenance Manual ...

Page 32: ...D Troubleshooting 2 17 Procedure 1 FDD Head Cleaning Check 2 17 Procedure 2 Diagnostic Test Program Execution Check 2 17 Procedure 3 Connector Check and Replacement Check 2 18 2 6 Hard Disk Drive HDD Troubleshooting 2 19 Procedure 1 Partition Check 2 19 Procedure 2 Message Check 2 20 Procedure 3 Format Check 2 20 Procedure 4 Diagnostic Test Program Execution Check 2 21 2 7 Keyboard Troubleshooting...

Page 33: ...ED 2 12 Figure 2 3 Cable connection diagram 2 16 Tables Table 2 1 Battery icon 2 5 Table 2 2 DC IN icon 2 5 Table 2 3 Printer port LED boot mode status 1 2 2 13 Table 2 4 Printer port LED Hibernation mode error status 2 15 Table 2 5 FDD error codes and statuses 2 17 Table 2 6 Hard disk drive error codes and statuses 2 22 ...

Page 34: ...s are described in Chapter 3 and Replacement Procedures are detailed 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 Clean...

Page 35: ...de to determine which troubleshooting procedures to execute Before going through the flowchart steps do the following q Verify with the customer that Toshiba Windows 95 is installed on the hard disk Non Toshiba operating systems can cause the computer to malfunction q Make sure all optional equipment is removed from the computer q Make sure the floppy disk drive is empty ...

Page 36: ...2 Troubleshooting Procedures 2 2 Troubleshooting Flowchart Libretto 50CT 70CT Maintenance Manual 2 3 Figure 2 1 Troubleshooting flowchart 1 2 ...

Page 37: ...edures 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 do the System Board troubleshooting procedures in Section 2 4 2 If an error is detected on the floppy disk test do the FDD troubleshooting procedures in Section 2 5 3 If an error is detected on the hard disk test do the Hard Disk Drive trouble...

Page 38: ...C IN icons as shown in the tables below Table 2 1 Battery icon Battery icon Power supply status Lights orange Quick charge 1 Lights green Battery has a full charge and the AC adapter is connected Blinks orange even intervals The battery level becomes low while operating the computer on battery power 2 Doesn t light Any condition other than those above If the battery becomes too hot charging will s...

Page 39: ... the computer s power supply may malfunction or a fuse on the system board may be blown Procedure 2 Error Code Check If the microprocessor detects a malfunction the DC IN icon blinks orange The blink pattern indicates an error as shown below q Start Off for 2 seconds q Error code 8 bit 1 On for one second 0 On for half second Interval between data bits Off for half second Error codes begin with th...

Page 40: ...de Meaning 20h VCC voltage is over the limit 21h VCC voltage is under the limit 22h VCC does not start up when power supply is turned on q B3V output Error code Meaning 30h B3V voltage is over the limit 31h B3V voltage is under the limit 33h B3V does not start up when the power supply is turned on q Power supply microcontroller Error code Meaning 50h Firmware or program error q CPU environmental c...

Page 41: ... 10h displays q Make sure the battery pack is correctly installed in the computer If it is go to the following step q Replace the battery pack with a new one If the error still exists go to Procedure 4 Check 4 When 88h displays it indicates that the CPU temperature is outside the allowable operating range Do the following q Leave the computer in an area that is about room temperature until the CPU...

Page 42: ...connected correctly go to Check 2 Check 2 Replace the AC adapter with a new one If the DC IN icon does not glow green go to Procedure 4 Procedure 4 Replacement Check The AC adapter may be disconnected or damaged Disassemble the computer following the steps described in Chapter 4 Replacement Procedures After checking the connection do the following checks Check 1 Replace the AC adapter with a new o...

Page 43: ...shown on the display perform Check 1 q If there is no error message go to Procedure 2 q If Toshiba MS DOS or Toshiba Windows 95 is properly loaded go to Procedure 3 Check 1 If one of the following error messages displays on the screen press the F1 key as instructed These errors occur when the system configuration preserved in the RTC memory CMOS type memory is not the same as the actual configurat...

Page 44: ...heck 3 The IRT checks the system board When the IRT detects an error the system stops or an error message displays If one of the following error messages 1 through 17 24 or 25 displays replace the system board If error message 18 displays go to the Keyboard Troubleshooting Procedures in Section 2 7 If error message 19 20 or 21 displays go to the HDD Troubleshooting Procedures in Section 2 6 If err...

Page 45: ...s 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 Plug the printer port LED into the computer s parallel port 2 Hold the space bar down and turn the computer on 3 Read the LED status from left to right as you are facing the back of the computer 4 Convert the status from binary...

Page 46: ...PIT ERROR PIT initialization PIT function check MEMORY REFRESH ERROR TIMER CH 2 OUT ERROR 03H CMOS check KB initialization CMOS CHECKSUM ERROR CMOS BAD BATTERY ERROR 04H Initialization of memory configuration 05H SM RAM check 06H ROM RAM copy 07H Selftest skip check Read PS Information 08H Initialization of internal VGA 0AH First 64 KB memory test FIRST 64KB MEMORY ERROR FIRST 64KB MEMORY PARITY E...

Page 47: ...on ROM C0H Password check FEH Setup boot check Bad xxxx xxxx Check system Then press F1 key Boot load Check 1 If the following error codes display go to Procedure 5 00h 02h 03h 04h 05h 06h 07h 08h 0Ah 0Bh 0Ch 0Dh 18h 1Fh 25h 30h 40h 41h 42h 55h 65h 70h 80h 90h A0h A6h Check 2 If error code 4AH displays go to the Keyboard Troubleshooting procedures in Section 2 7 Check 3 If error code 55H displays ...

Page 48: ...le 2 4 go to Procedure 5 Table 2 4 Printer port LED Hibernation mode error status Error status Meaning of status F1H System BIOS RAM checksum error F2H Optional ROM or Optional Card CGA MDA is connected F7H Extended memory checksum error E1H Instant on error extended memory checksum error Procedure 4 Diagnostic Test Program Execution and Replacement Checks Execute the following tests from the Diag...

Page 49: ...res 2 16 Libretto 50CT 70CT Maintenance Manual Procedure 5 Connection Check Check each cable connection shown in Figure 2 3 then retry the computer s operation If the problem still exists another I O interface may be faulty Figure 2 3 Cable connection diagram ...

Page 50: ...using the cleaning kit If the FDD still does not function properly after cleaning go to Procedure 2 If the test program cannot be executed on the computer go to Procedure 2 Procedure 2 Diagnostic Test Program Execution Check Insert the diagnostics disk into the FDD turn on the computer and run the test Refer to Chapter 3 Tests and Diagnostics for more information about the diagnostics test procedu...

Page 51: ...2 5 Floppy Disk Drive FDD Troubleshooting 2 Troubleshooting Procedures 2 18 Libretto 50CT 70CT Maintenance Manual EEh Write buffer error ...

Page 52: ...onnector Check and Replacement Check The FDD cable and PC card is a single unit Install the PC card in the computer then begin with Check 1 below Check 1 Make sure the PC card is properly connected to the system board If the connection is loose reinstall the PC card and repeat Procedure 2 If there is still an error go to Check 2 Check 2 The FDD may be defective or damaged Replace the FDD with a ne...

Page 53: ... 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 operating system instructions Procedure 1 Partition Check Insert the Toshiba MS DOS system disk turn the computer on then perform the following checks Check 1 Type C and press Enter If you cannot change to drive C go to Check 2 If you can go to Pro...

Page 54: ... disk using the SYS command If the following message displays the system program has been transferred to the HDD Restart the computer If the error message still displays go to Check 4 System transferred Check 4 If the HDD is firmly connected to the system board go to Check 5 Check 5 The HDD connector may be defective or damaged Replace the HDD connector with a new one following the steps in Chapte...

Page 55: ...at 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 on the Diagnostics Disk Do all of the HDD tests in the Hard Disk Drive Test Refer to Chapter 3 Tests and Diagnostics for more information ...

Page 56: ... found 06h HDC not reset 08h DMA overrun error 09h DMA boundary error 10h CRC error 20h FDC error 40h Seek error 60h FD not in drive 80h Time out error EEh Write Buffer error FFh Data compare error Check 1 Replace the HDD unit with a new one following the instructions in Chapter 4 Replacement Procedures If the HDD is still not functioning properly do Check 2 Check 2 Replace the system board with a...

Page 57: ...rmation 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 system board by flat cables These cables or connectors may be disconnected or damaged If there is a problem with the keyboard disassemble the computer as described in Chapter 4 Re...

Page 58: ...on Check Execute the Pointing Device Test in the Diagnostic Program Refer to Chapter 3 Tests and Diagnostics for information on how to do the test program If an error occurs go to Procedure 2 If an error does not occur the pointing device is functioning properly Procedure 2 Connector and Replacement Check The pointing device is connected to the system board by flat cables These cables or connector...

Page 59: ...display is functioning properly Procedure 2 Connector Check The Display unit has an LCD module FL and FL inverter board Disassemble the display unit and check the cable connections Refer to Chapter 4 Replacement Procedures for more information about how to disassemble the computer If any cable is not connected firmly reconnect it and repeat Procedures 1 and 2 If the problem still exists go to Proc...

Page 60: ...splay again If the problem still exists go to Check 3 Check 3 Replace the FL inverter board with a new one and test the display again If the problem still exists go to Check 4 Check 4 Replace the FL with a new one and test the display again If the problem still exists go to Check 5 Check 5 The system board may be damaged Replace the system board with a new one ...

Page 61: ...Chapter 3 Tests and Diagnostics ...

Page 62: ...3 ii Libretto 50CT 70CT Maintenance Manual ...

Page 63: ...st 3 27 3 13 NDP Test 3 29 3 14 Expansion Test 3 30 3 15 Sound Test 3 31 3 16 Error Codes and Error Status Names 3 32 3 17 Hard Disk Test Detail Status 3 35 3 18 Hard Disk Format 3 37 3 18 1 Function Description 3 37 3 18 2 Operations 3 38 3 19 Head Cleaning 3 41 3 19 1 Function Description 3 41 3 19 2 Operations 3 41 3 20 Log Utilities 3 42 3 20 1 Function Description 3 42 3 20 2 Operations 3 42 ...

Page 64: ...3 iv Libretto 50CT 70CT Maintenance Manual 3 22 2 Operations 3 45 ...

Page 65: ... 3 Moving Within the SETUP Menu and Changing Values 3 52 3 24 4 Accepting Changes and Exiting the SETUP Window 3 52 3 24 5 The Factory Preset Configuration 3 52 3 24 6 SETUP Options 3 53 Tables Table 3 1 Subtest names 1 2 3 7 Table 3 2 Error codes and error status names 1 3 3 32 Table 3 3 Hard disk controller status register contents 3 35 Table 3 4 Error register contents 3 36 Table 3 5 Hard disk ...

Page 66: ...eck all cables for loose connections 2 Exit any application you may be using and close Windows The DIAGNOSTICS MENU consists of the following functions q DIAGNOSTIC TEST q HARD DISK FORMAT q HEAD CLEANING q LOG UTILITIES q RUNNING TEST q FDD UTILITIES q SYSTEM CONFIGURATION q EXIT TO MS DOS q SETUP The DIAGNOSTIC TEST MENU contains the following functional tests q SYSTEM TEST q MEMORY TEST q KEYBO...

Page 67: ...nal FDD q Cleaning kit to clean the floppy disk drive heads Head Cleaning q PC card wraparound connector PCMCIA test q Serial port wraparound connector RS 232C test q Parallel port wraparound connector Printer test q I O Adapter q Serial port direct cable The following sections detail the tests within the Diagnostic Test function of the DIAGNOSTIC TEST MENU Refer to Sections 3 19 through 3 24 for ...

Page 68: ...D and insert the diskette containing the test program 2 Turn the computer on to execute the test program and the test menu will display The following menu displays TOSHIBA personal computer xxx DIAGNOSTICS version X XX c copyright TOSHIBA Corp 19XX DIAGNOSTICS MENU 1 DIAGNOSTIC TEST 2 HARD DISK FORMAT 3 4 HEAD CLEANING 5 LOG UTILITIES 6 RUNNING TEST 7 FDD UTILITIES 8 SYSTEM CONFIGURATION 9 EXIT TO...

Page 69: ...19XX DIAGNOSTIC TEST MENU 1 SYSTEM TEST 2 MEMORY TEST 3 KEYBOARD TEST 4 DISPLAY TEST 5 FLOPPY DISK TEST 6 PRINTER TEST 7 ASYNC TEST 8 HARD DISK TEST 9 REAL TIMER TEST 10 NDP TEST 11 EXPANSION TEST 12 SOUND TEST 88 ERROR RETRY COUNT SET HDD FDD 99 EXIT TO DIAGNOSTICS MENU Refer to Sections 3 4 through 3 15 for detailed descriptions of Diagnostic Tests 1 through 12 Function 88 sets the floppy disk d...

Page 70: ... write 99 Exit to DIAGNOSTIC TEST MENU NOTE The menu displayed by your computer may be slightly different from the one shown above 5 Select the desired subtest number from the subtest menu and press Enter The following message displays TEST LOOP YES Error Stop YES Select YES for TEST LOOP to set the test to run continuously until it is halted by the user Select NO to return to the main menu after ...

Page 71: ...ogram and exits to the subtest menu 2 Continues the test 3 Restarts the test from the error Use the arrow keys to move the cursor to the desired option and press Enter Select NO for ERROR STOP to keep the test running even if an error is found Table 3 1 in Section 3 3 lists the function of each test on the subtest menu Table 3 2 in Section 3 16 lists the codes and statuses for each error ...

Page 72: ...ddress pattern data 03 RAM refresh 04 Protected mode 05 Memory module 06 Cache memory 3 KEYBOARD 01 Pressed key display 02 Not used 03 PS 2 mouse connect check 04 Pointing stick 4 DISPLAY 01 VRAM read write for VGA 02 Gradation for VGA 03 Gradation for LCD 04 Gradation mode test for VGA 05 All dots on off for LCD 06 H pattern display 5 FDD 01 Sequential read 02 Sequential read write 03 Random addr...

Page 73: ...around test 06 Infra_red transmit mode 07 Infra_red receive mode 8 HDD 01 Sequential read 02 Address uniqueness 03 Random address data 04 Cross talk peak shift 05 Write read compare CE 06 Write specified address 07 Read specified address 08 ECC circuit 09 Sequential write 10 W R C specified address 9 REAL TIMER 01 Real time 02 Backup memory 03 Real time carry 10 NDP 01 NDP test 11 EXPANSION 01 PCM...

Page 74: ...est select 1 from the Diagnostic Test Menu press Enter and follow the directions on the screen The System Test contains one test that tests the system Move the highlight bar to the subtest you want to execute and press Enter Subtest 01 ROM checksum This subtest executes a checksum test of the BIOS ROM on the system board ...

Page 75: ...0000h Subtest 02 RAM address pattern data real mode This subtest writes address pattern data created by the exclusive ORing XORing to the address segment and address offset in conventional memory from program end to 640 KB then reads the new data and compares the result with the original data Subtest 03 RAM refresh real mode This subtest writes a 256 byte unit of constant data to conventional memo...

Page 76: ...is 8 MB or 16 MB After selecting subtest 05 the following message displays Extended memory size 1 8 MB 2 16 MB Select the number that corresponds to the memory card installed in the computer Subtest 06 Cache memory To test the cache memory a pass through write read comparison of 5A data is run repeatedly to the test area 7000 Program size to 7000 7FFF 32 KB to check the hit miss ratio on off statu...

Page 77: ... the Overlay mode must be off to execute this subtest When you execute this subtest the keyboard layout is drawn on the display as shown below When any key is pressed the corresponding key on the screen changes to the corresponding character Holding a key down enables the auto repeat function which causes the key s display character to blink Press Key Display If test OK Press Del Enter Key Subtest...

Page 78: ... switch function check This test reports the pointing stick motion response from the IPS and IPS switch When the stick is pressed towards the upper left the POINTING display changes according to the following illustration If an IPS switch is pressed the BUTTON display alternates between black and white Also the parameters appear on the right side of the display If two IPS switches are pressed at t...

Page 79: ... constant data AAh and 55h and address data to video RAM 2MB A0000h AFFFFh This data is then read from the video RAM and compared to the original data Subtest 02 Gradation for VGA This subtest displays four colors red green blue and white from left to right across the screen from black to maximum brightness The image below displays on the screen when this subtest executes To exit this subtest and ...

Page 80: ...for VGA This subtest displays gradations for each mode Execute the test then press Enter to change the mode Resolution Mode 640 x 480 3 12 13 The image below displays on the screen when this subtest executes Pressing Enter changes the size of the displayed image Pressing Enter changes the size of the displayed image ...

Page 81: ...ubtest displays a full screen of H patterns HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHHHHHH...

Page 82: ...ess Enter Test drive number select 1 FDD 1 2 FDD 2 0 FDD1 2 2 Select the media type of the floppy disk in the test drive to be tested and press Enter Media in drive X mode 0 2DD 1 2D 2 2D 2HD 2DD 3 2HD If you enter 2 or 3 the following message will display 2HD Media mode 1 1 20MB 21 44MB 3 Select the track you want the test to start on and press Enter Simply pressing Enter sets the start track to ...

Page 83: ...ing message displays during the FDD test Subtest 01 Sequential read This subtest performs a Cyclic Redundancy Check CRC that continuously reads all the tracks on a floppy disk The following tracks are read according to the media type in the floppy disk drive Double sided double density 2D Tracks 0 to 39 Double sided double density double track 2DD and double sided high density double track 2HD Tra...

Page 84: ...rites random data to random addresses on all tracks defined in Subtest 01 The data is then read and compared to the original data Subtest 04 Write specified address This subtest writes specified data to a specified track head and address Subtest 05 Read specified address This subtest reads data from a specified track head and address ...

Page 85: ...ess Enter If you are running Subtest 03 the test will automatically start when you press Enter If you are running Subtests 01 02 or 04 the following message displays Select the printer mode 1 80 2 136 3 Enter 1 or 2 to select the printer mode That is 1 for 80 characters per line or 2 for 136 characters Press Enter and the following message displays Select the test mode 1 page 2 all If you select p...

Page 86: ...le strike print All characters print This subtest prints the various print types shown below Subtest 03 Wraparound NOTE To execute this subtest a parallel port wraparound connector must be connected to the printer port The parallel port wraparound connector 34M741986G01 wiring diagram is described in Appendix E This subtest checks the output and bi directional modes of the data control and the sta...

Page 87: ... 2 XXXXh Channel 3 XXXXh Select the Channel number 1 2 3 The serial I O port address is specified by the XXXXh number Select the serial port channel number and press Enter to start the subtest Subtest 01 Wraparound board NOTE To execute this subtest a serial port wraparound connector 34M741621G01 must be connected to the serial port The serial port wraparound connector wiring diagram is described ...

Page 88: ...d data Subtest 04 Interrupt test This subtest checks the Interrupt Request Level of IRQ 3 4 and 5 from the send side Subtest 05 Infra_red wrap_around test This subtest checks the data send receive function through the Infra_red port Subtest 06 Infra_red transmit mode This subtest checks the data send function through the Infra_red port Subtest 07 Infra_red receive mode This subtest checks the data...

Page 89: ...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 operating system instructions 1 Select the hard disk drive number to be tested Test drive number 1 2 1 2 2 This message is used to select the retry operation when the hard disk controller detects an error Select yes or no HD...

Page 90: ...pe the number of the subtest that you want to run and press Enter The following displays TEST LOOP YES ERROR STOP YES After you select TEST LOOP or ERROR STOP the test will automatically start Subtest 01 Sequential read This subtest is a sequential reading of all the tracks on the HDD starting at track 0 When all the tracks on the HDD have been read the test starts at the maximum track and sequent...

Page 91: ...te read compare CE This subtest writes B5ADADh worst pattern data to the CE cylinder on the HDD then reads the data from the CE cylinder and compares it with the original data Subtest 06 Write specified address This subtest writes specified data to a specified cylinder and head on the HDD Subtest 07 Read specified address This subtest reads data which has been written to a specified cylinder and h...

Page 92: ...s Current date XX XX XXXX Current time XX XX XX Enter new date PRESS ENTER KEY TO EXIT TEST 2 If the current date is not correct input the correct date at the Enter new date prompt and press Enter The following prompt will display Enter new time 3 If the current time is not correct input the correct time in 24 hour format Press Enter to toggle between the time and the date To exit press Ctrl Break...

Page 93: ...xecuted the current date and time are erased This subtest checks the real time clock increments making sure the date and time are displayed in the following format Current date 12 31 1995 Current time 23 59 58 Press Enter to display the following Current date 01 01 1996 Current time 00 00 00 PRESS Enter KEY TO EXIT TEST Press Ctrl Break to exit ...

Page 94: ...elect 10 from the Diagnostics Test Menu press Enter and follow the directions on the screen The NDP test contains one subtest that tests the NDP functions Subtest 01 NDP Test This test checks the following functions of the coprocessor q Control word q Status word q Bus q Addition q Multiplication Press Ctrl Break to exit ...

Page 95: ...paround connector is required Subtest 01 PCMCIA wraparound This test checks the following signal line of the PC card slot q Address line q REG CE 1 CE 2 line q Data line q Speaker line q Wait line q BSY BVD1 line This subtest is executed in the following order Sub Address Good Bad Contents 01 00001 00001 nn nn xx xx Address line REG CE 1 CE 2 nn A0 90 80 00 02 00002 ww rr Data line ww write data r...

Page 96: ...me sound so when you use the headphones be careful to set the volume low and adjust it as necessary Using the headphones at full volume could damage your hearing Subtest 01 FM synthesizer Load the COM file Connect headphones or speakers and execute the OPL3 SA3 YMF711 function test The eight note musical should play through both sides of the headphones or through both speakers Subtest 02 SINE wave...

Page 97: ...ot Changed 14 Memory Read Write Error DD Cache Memory Error Keyboard 01 Mouse Interface Error 02 IPS Interface Error 03 Interface Error 04 Retransmit Error 05 Mouse Handler Not Supported 06 PS 2 Mouse IPS Not Supported FDD 01 Bad Command 02 Address Mark Not Found 03 Write Protected 04 Record Not Found 06 Media Removed 08 DMA Overrun Error 09 DMA Boundary Error 10 CRC Error 20 FDC Error 40 Seek Err...

Page 98: ...r Card Modem 34 Error Card Modem 36 No Dial Tone Card Modem HDD 01 Bad Command Error 02 Address Mark Not Found 04 Record Not Found 05 HDC Not Reset Error 07 Drive Not Initialized 08 HDC Overrun DRQ 09 DMA Boundary Error 0A Bad Sector 0B Bad Track Error 10 ECC Error 11 ECC Recover Enabled 20 HDC Error 40 Seek Error 80 Time Out Error AA Drive Not Ready BB Undefined Error CC Write Fault E0 Status Err...

Page 99: ...0CT Maintenance Manual Table 3 2 Error codes and error status names 3 3 Device name Error code Error status name PCMCIA C1 Address Line Error C2 REG Line Error C3 CE 1 Line Error C4 CE 2 Line Error C5 DATA Line Error C6 WAIT Line Error C7 BSY Line Error C8 BVD1 Line Error CD No PCMCIA ...

Page 100: ...register The contents of the HDC status register and error register are listed in Tables 3 3 and 3 4 Table 3 3 Hard disk controller status register contents Bit Name Description 7 BSY 0 HDC is ready Busy 1 HDC is busy 6 DRDY 0 Hard disk drive is not ready to accept any command Drive ready 1 Hard disk drive is ready to accept any command 5 DWF 0 DWF error is not detected Drive write fault 1 Write f...

Page 101: ...rrectable 0 There is no uncorrectable data error 1 Uncorrectable data error has been detected 5 Not used 4 IDNF Identification 0 Not used 1 There was no ID field in the requested sector 3 Not used 2 ABRT Abort 0 Not used 1 Illegal command error or a drive status error occurs 1 TK00 0 The hard disk has found track 0 during a recalibrate command Track 0 1 The hard disk could not find track 0 during ...

Page 102: ...the hard disk onto floppy disk 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 operating system instructions 3 18 1 Function Descri...

Page 103: ... is displayed when the program is complete If an error other than a bad track is detected the program is automatically terminated 3 18 2 Operations NOTE After the HDD has been formatted execute the Toshiba MS DOS FDISK command to partition the HDD Next execute the Toshiba MS DOS FORMAT command Refer to the Toshiba MS DOS manual for more information about using these commands Select 2 and press Ent...

Page 104: ...alone is the same as executing All Track Format described in item d below WARNING Current DISK data will be completely destroyed Press Bad cylinder number dddd key Press Bad head number dd key Enter the cylinder and head number in the format above by decimal notation Repeat for each bad track you want to format After entering the bad tracks press Enter to execute the format d All track format All ...

Page 105: ...he Hard Disk Format menu 3 Bad track FORMAT To format a track as a bad track enter the number for drive interleave cylinder and head as indicated in the screen prompt shown below Drive number select 1 1 2 2 Interleave number 1 1 8 Press Cylinder number dddd Press Head number dd Press Enter to return to the Hard Disk Format menu 4 Bad track CHECK This subtest reads the entire disk and displays a li...

Page 106: ...form this program 3 19 2 Operations 1 Select 4 from the Diagnostic Menu and press Enter to display the following messages DIAGNOSTICS FLOPPY DISK HEAD CLEANING VX XX Mount cleaning disk s on drive s Press any key when ready 2 Remove the Diagnostics Disk from the FDD insert the cleaning disk and press Enter 3 When the cleaning start message displays the FDD head cleaning has begun 4 The display aut...

Page 107: ... If the power switch is turned off the error information will be lost The error information displays in the following order 1 Error count CNT 2 Test name TS NAME 3 Subtest number TS NAME 4 Pass count PASS 5 Error status STS 6 FDD HDD or memory address ADDR 7 Write data WD 8 Read data RD 9 HDC status HSTS 10 Error status name STATUS NAME 3 20 2 Operations 1 Select 5 and press Enter on the Diagnosti...

Page 108: ...y scrolls the display to the previous page The 3 key returns to the Diagnostic Menu The 4 key erases all error log information in RAM The 5 key outputs the error log information to a printer The 6 key reads the log information from a floppy disk The 7 key writes the log information to a floppy disk 3 In the case of error retry OK a capital R will be placed at the beginning of the error status Howe...

Page 109: ...ill be generated during the FDD test 1 Remove the diagnostics disk from the floppy disk drive and insert the work disk 2 Select 6 from the Diagnostic Menu and press Enter the following message displays Printer wrap around test Y N Select Y yes to execute the printer wraparound test A printer wraparound connector must be connected to the parallel port of the computer to properly execute this test 3...

Page 110: ...ppy disk in the following formats 2DD Double sided double density double track 96 135 TPI MFM mode 512 bytes 9 sectors track b 2HD Double sided high density double track 96 135 TPI MFM mode 512 bytes 18 sectors track 2 COPY This program copies data from a source floppy disk to a target floppy disk 3 DUMP This program displays the contents of the floppy disk and the designated sectors of the hard d...

Page 111: ...om the FDD insert the work disk and press any key The following message displays when the FDD format is executed FDD TYPE TRACK XXX FDD TYPE HEAD X FDD TYPE SECTOR XX Format start track head XXX X After the floppy disk is formatted the following message displays Format complete Another format 1 Yes 2 No e Type 1 to display the message from step c above Type 2 to return the test to the Diagnostic M...

Page 112: ...m b displays again After the floppy disk has been copied the following message will display Copy complete Another copy 1 Yes 2 No e To copy another disk type 1 and the message from a will display again Enter 2 to return the test program to the Diagnostic Menu 5 DUMP program a When dump is selected the following message displays DIAGNOSTICS HARD DISK FLOPPY DISK DUMP VX XX Drive type select 1 FDD 2...

Page 113: ...sk press any key and the following message displays Insert source disk into drive A Press any key when ready e Insert a source disk press any key and the following message displays Max address Track xxx Head xx Sector xx Track number f Set the track number you want to dump The system will access the disk and dump a list ...

Page 114: ...s 7 Number of ASYNC ports 8 Number of hard disk drives 9 Number of printer ports 10 Extended memory size 11 Number of math co processors 12 CPU clock 3 23 2 Operations Select 8 from the Diagnostic Menu and press Enter to display the following system configuration SYSTEM CONFIGURATION BIOS ROM VERSION VX XX BOOT ROM VERSION VX XX KBC VERSION VX XX PS MICOM VERSION VX XX 639K MEMORY 1 FLOPPY DISK DR...

Page 115: ... Total b Base c Extended d Shadow BIOS ROM 2 Display a Display Adapter b LCD Display Colors c Power On Display d VGA Segment Address e Text Mode Stretch 3 Hard Disk 4 Password 5 I O Ports a Serial Port b Infared Port c Parallel Port d Sound System 6 Others a Power up Mode b CPU Cache c System Auto Off d Alarm Volume e System Beep f Panel Power On Off g Alarm Power On h Pointing Devices i Boot Prio...

Page 116: ...Program Select 0 from the Diagnostics Menu and press Enter to display the TSETUP screen Select items Space BkSp Change values Esc Exit without saving Home Set default values End Save changes and Exit NOTE The Panel Power On Off and System Auto Off items appear only when the computer is in Hibernation mode ...

Page 117: ...he SETUP Window 1 Press End to accept the changes you made If the changed item does not require the system to reboot the following message displays Are you sure Y N If the changed item requires the system to reboot the following message displays Are you sure Y N The changes you made will cause the system to reboot 2 To make other changes press N Repeat the steps above 3 To accept the changes press...

Page 118: ...alues a Total Displays the total amount of memory installed and is automatically calculated by the computer b Base Displays 640 KB the base amount of conventional memory automatically calculated by the computer c Extended Displays the amount of memory beyond base memory that the computer can access d Shadow BIOS ROM Displays 256 KB the amount of RAM used to copy ROM files 2 Display These options c...

Page 119: ...neous Selects both the internal LCD and the external CRT for simultaneous display NOTE When starting the computer in Resume mode the last configuration is remembered If data does not appear on the display you are using after starting in Resume mode press Fn F5 Pressing Fn F5 changes the display setting as follows internal LCD to simultaneous to external CRT d VGA Segment Address E4000h Default C00...

Page 120: ...ed IDE and Standard IDE are different so if you change the setting you will have to reformat the hard disk for the appropriate setting 4 Password This option allows you to set or reset the user password for power on and instant security Registered The user password has been registered Not registered The user password has not been registered 5 I O ports This option controls settings for serial and ...

Page 121: ...rt This option allows you to set the COM level for the infrared port The infrared port interrupt request level IRQ and I O port base address for each COM level is shown below COM level Interrupt level I O address COM 1 4 3F8H COM 2 3 2F8H COM 3 4 3E8H COM 3 5 3E8H COM 3 7 3E8H COM 4 3 2E8H COM 4 5 2E8H COM 4 7 2E8H Not Used Disables port Default When you select one of the above options except for ...

Page 122: ...rt Type see settings below is set to ECP the DMA channel can also be set to 1 2 or 3 The default is 3 LPT setting Interrupt level I O address DMA Channel LPT 1 7 378H 3 LPT 2 5 278H 3 LPT 3 7 3BCH 3 Not Used Default Others Other settings are made automatically by the Plug and Play operating system When you select one of the above options except for Not used a subwindow similar to the one below dis...

Page 123: ...1 IRQ levels WSS Play DMA and SBPro DMA for the sound system Some of the values displayed cannot be changed on the Libretto WSS I O Address Use this option to set the WSS I O address from among the following settings 530h default 540h 550h 560h SBPro I O Address Use this option to set the SBPro I O address from among the following settings 220h default 240h Synthesizer I O Address You cannot chang...

Page 124: ... Address You cannot change this value MPU401 MIDI I F IRQ Level You cannot change this value 6 Others Whether or not you need to configure the computer with these options depends primarily on the kind of software or peripherals you use a Power up Modes This option lets you choose between AutoResume and boot mode You can also set this option using hotkeys Boot Turns on boot mode Default Hibernation...

Page 125: ...hibernation mode when you are working in DOS In Boot mode it is disabled and not displayed Disabled Disable system automatic power off xx Min Automatically turns off power to the system if it is not used for the duration set The duration xx can be set to 10 20 30 40 50 or 60 minutes d Alarm Volume This option disables or sets the volume level of the alarm Setting this option to off disables the co...

Page 126: ...E Do not remove the AC adapter and battery pack at the same time when you use this feature If you do data saved by AutoResume will be lost You must also reset this option g Alarm Power On This option lets you set a time and date for automatic power on and lets you enable or disable the ring indicator feature Ring Indicator is displayed only when the computer is in Resume mode and Alarm Date Option...

Page 127: ...use the computer h Pointing Devices This option enables or disables the AccuPoint Auto selected If the PS 2 mouse is connected to the computer when you turn the power on the PS 2 mouse is enabled and the AccuPoint is disabled Otherwise the AccuPoint is enabled Default Simultaneous Enables both the AccuPoint and PS 2 mouse i Boot Priority Use this option to select the disk drive priority for boot u...

Page 128: ...Chapter 4 Replacement Procedures ...

Page 129: ...4 ii Libretto 50CT 70CT Maintenance Manual ...

Page 130: ... Switch Board 4 27 4 14 AccuPoint Board 4 29 4 15 LCD Flexible Cable 4 31 4 16 I O Adapter Board 4 33 Figures Figure 4 1 Removing the battery pack 4 6 Figure 4 2 Removing the PC Card 4 8 Figure 4 3 Installing the PC card 4 9 Figure 4 4 HDD cover removal 4 10 Figure 4 5 HDD removal 4 11 Figure 4 6 HDD bracket removal 4 11 Figure 4 7 Keyboard brace removal 4 12 Figure 4 8 Screw removal 4 12 Figure 4...

Page 131: ...val 4 22 Figure 4 19 FL inverter board removal 4 23 Figure 4 20 LCD module removal 4 25 Figure 4 21 Power switch board removal 4 27 Figure 4 22 Speaker removal 4 28 Figure 4 23 Inserting the speaker fix shaft 4 28 Figure 4 24 AccuPoint board removal 4 29 Figure 4 25 Flexible cable removal 4 31 Figure 4 26 Preforming the LCD flexible cable 4 32 Figure 4 27 Silver screw removal 4 33 Figure 4 28 Uppe...

Page 132: ...able Units FRUs It may not be necessary to remove all the FRUs in order to replace one The chart below is a guide to which FRUs need to be removed in order to remove others Always start by removing the battery pack then follow the lines on the chart to determine which FRU you must remove next in order to repair the one you think is causing the computer to operate improperly ...

Page 133: ...d from the power source 2 Remove any metal jewelry or accessories such as necklaces bracelets or rings Batteries in the computer retain electrical charge so there is danger of electrical shock even when the computer is disconnected from an AC power source 3 Never work with wet or damp hands 4 The computer contains many sharp edges and corners so be careful not to injure yourself 5 Make sure that a...

Page 134: ...ng the necessary diagnostics tests described in this manual 5 Do not perform any operations that are not necessary and use only the described procedures for removing and installing FRUs in the computer 6 After removing parts from the computer place them in a safe place away from the computer so they will not be damaged and will not interfere with your work 7 You will remove and replace many screws...

Page 135: ...xible cable connectors are used for all other cables The cables can be connected to and disconnected from these connectors by simply pulling or pushing Reassembly Procedures After you have disassembled the computer and fixed or repaired the problem that was causing the computer to operate abnormally you will need to reassemble the computer While assembling the computer remember the following gener...

Page 136: ...to lift out screws that you cannot grasp with your fingers q ESD mats for the floor and the table you are working on q An ESD wrist strap or heel grounder q Antistatic carpeting or flooring q Air ionizers in highly static sensitive areas q Plastic card the size of a credit card Screw Tightening Torques When you fasten screws be sure to follow the torque list below Overtightening can damage compone...

Page 137: ...re 4 1 1 Turn the computer off Disconnect the AC adapter and other optional units from the computer 2 Turn the computer upside down 3 Slide the battery release latch to the left to unlock it 4 With the battery facing up slide it out Figure 4 1 Removing the battery pack NOTE For environmental reasons do not throw away a spent battery pack Please return spent battery packs to your Toshiba dealer ...

Page 138: ...tery The battery can explode if not properly replaced used handled or disposed of Use only batteries recommended by Toshiba as replacements NOTE Check the battery terminals visually If they are dirty wipe them clean with a dry cloth 1 Turn the computer off Disconnect the AC adapter and all the external cables from the computer 2 Hold the battery in line with the guide rail 3 Push the battery into ...

Page 139: ... card be sure the computer is in boot mode Follow the steps below and refer to Figure 4 2 1 Turn the computer off 2 Slide the PC card release lever to the right 3 The PC card comes out slightly Hold it securely and pull it out Figure 4 2 Removing the PC Card NOTE The unit may contain a dummy card which is inserted or removed in the same manner as a normal PC card ...

Page 140: ... 4 2 NOTE Before installing the PC card be sure that the computer is in boot mode 1 Turn the computer off 2 Insert the PC card Carefully push it into place Figure 4 3 Installing the PC card 3 Visually check that when the PC card is fully inserted the PC card release lever is positioned on the left NOTE The unit may contain a dummy card which is inserted or removed in the same manner as a normal PC...

Page 141: ...moving the HDD To remove the HDD follow the steps below and refer to Figures 4 4 to 4 6 1 Turn the computer upside down 2 Remove two M2x14 silver screws and then the HDD cover CAUTION Be careful not to press on the top or bottom of the HDD Undue pressure can destroy data or damage the drive Figure 4 4 HDD cover removal ...

Page 142: ...ket Figure 4 5 HDD removal 4 Remove two thin flat head M3 screws from the HDD bracket and separate the bracket and the HDD Figure 4 6 HDD bracket removal Installing the HDD To install the HDD follow the steps below and refer to figures 4 6 back through 4 4 1 Secure the HDD bracket to the HDD with two thin flat head M3 screws 2 Insert the HDD board side up into the HDD slot and push it carefully an...

Page 143: ...4 7 to 4 9 1 Open the display fully 2 Release the keyboard brace at six points by lifting it from right to left Remove the keyboard brace Figure 4 7 Keyboard brace removal 3 Remove one M2x4 screw that secures the keyboard then lift the keyboard out from the top Note the extensions on the bottom of the keyboard that fit into the base Lay the keyboard with the cables still connected face down on the...

Page 144: ... refer to Figures 4 9 back through 4 7 1 Connect the memory module to PJ140 on the system board CAUTION Do not touch the connectors of the memory module or computer Memory access trouble may arise from foreign matter adhering to the connectors 2 Secure the memory module with one thin head M2 5 screw 3 Place the keyboard The keyboard has tabs on the front so install it by inserting from the front t...

Page 145: ... Section 4 2 2 Release the keyboard brace at six points by lifting it from right to left Remove the keyboard brace 3 Remove one M2x4 screw that secures the keyboard NOTE The keyboard brace and M2x4 screw may have already been removed in Section 4 5 Optional Memory Module 4 Raise the keyboard toward the display to access the keyboard cable 5 Remove two M2x3 silver screws from the keyboard straps on...

Page 146: ...Replace two M2x3 silver screws that secure the keyboard straps 3 Place the keyboard by inserting the tabs on the bottom of the keyboard into the corresponding holes in the base taking care not to bend the flexible cable 4 Secure the keyboard with one M2x4 screw 5 Replace the keyboard brace NOTE If you are installing an optional memory module do that procedure first 6 Replace the battery as describ...

Page 147: ... the Display Assembly To remove the display assembly follow the steps below and refer to Figures 4 11 to 4 14 1 Remove the battery optional PC card HDD optional memory module and keyboard as described in Sections 4 2 through 4 6 2 Remove two thin head M2 5 screws and then the metal cover Figure 4 11 Metal cover removal ...

Page 148: ...4 17 3 Disconnect the display flexible cable from PJ3 on the system board Figure 4 12 Display flexible cable removal 4 Close the display turn the computer upside down and remove five M2x14 silver screws Figure 4 13 Five screws removal 5 Turn the computer back over and open the display ...

Page 149: ...oken flexible cable Figure 4 14 Display assembly removal Installing the Display Assembly To install the display assembly follow the steps below and refer to Figures 4 14 back through 4 11 1 Connect the display flexible cable to PJ3 on the system board 2 Place the display assembly onto the base 3 Secure the metal cover with two thin head M2 5 screws 4 Close the display turn the computer upside down...

Page 150: ...y as described in Sections 4 2 through 4 7 2 Disconnect the RTC battery cable from PJ4 on the system board and remove the RTC battery Figure 4 15 RTC battery removal Installing the RTC Battery To install the RTC battery follow the steps below and refer to Figure 4 15 1 Connect the RTC battery cable to PJ4 on the system board 2 Secure the RTC battery 3 Install the display assembly keyboard optional...

Page 151: ... Harness and remove the board NOTE Be careful of the IR lens cover it may fall out of the base Also the stereo jack plate is not attached and may fall off the system board 4 Disconnect the DC Jack Harness from PJ401 on the system board Figure 4 16 System board removal Installing the System Board To install the system board follow the steps below and refer to Figure 4 16 1 Attach the DC Jack Harnes...

Page 152: ...optional units from the computer 2 Remove the battery as described in Section 4 2 3 Remove two mask seals on the right and left in the lower part of the display mask to reveal two M2 5x5 screws 4 Remove two M2 5x5 screws concealed under the seals Figure 4 17 Mask seal removal 5 Remove the pointing cap 6 Carefully insert the fingers of both hands between the mask and LCD panel and release the latch...

Page 153: ...ay mask removal Installing the Display Mask To install the display mask follow the steps below and refer to Figures 4 18 and 4 17 1 Set the display mask in place 2 Press firmly to secure the latches as follows the bottom 6 latches sides 1 each and top 5 latches 3 Replace the pointing cap 4 Secure the display mask with two M2 5x5 screws 5 Replace the two mask seals 6 Replace the battery as describe...

Page 154: ...4 19 1 Turn the computer off Disconnect the AC adapter and optional units from the computer 2 Remove the battery and display mask as described in Sections 4 2 and 4 10 3 Remove one silver M2x3 screw that secures the FL inverter board 4 Remove the FL inverter board from the board clamp then carefully turn it to disconnect the FL cable from CN1 and the display flexible cable from CN2 Figure 4 19 FL ...

Page 155: ...o install the FL inverter board follow the steps below and refer to Figure 4 19 1 Connect the display flexible cable to CN2 and the FL cable to CN1 on the FL inverter board 2 Replace the FL inverter board and secure it with one silver M2x3 screw 3 Install the and display mask and battery as described in Sections 4 10 and 4 2 ...

Page 156: ...ter off Disconnect the AC adapter and optional units from the computer 2 Remove the battery display mask and FL inverter board as described in Sections 4 2 4 10 and 4 11 3 Remove four silver M2x3 screws that secure the LCD module to the LCD cover 4 Carefully turn the LCD module to remove it from the display cover and disconnect the display flexible cable from CN1 on the LCD module Figure 4 20 LCD ...

Page 157: ...nstall the LCD module follow the steps below and refer to Figure 4 20 1 Connect the display flexible cable to CN1 on the LCD module 2 Replace the LCD module and secure it to the LCD cover with four silver M2x3 screws 3 Install the FL inverter board display mask and battery as described in Sections 4 11 4 10 and 4 2 ...

Page 158: ... the steps below and refer to Figures 4 21 and 4 22 1 Turn the computer off Disconnect the AC adapter and optional units from the computer 2 Remove the battery display mask FL inverter board and LCD module as described in Sections 4 2 and 4 10 through 4 12 3 Disconnect three flexible cables from PJ3 PJ11 and PJ12 then remove the power switch board Figure 4 21 Power switch board removal ...

Page 159: ...he Power Switch Board To install the power switch board follow the steps below and refer to Figures 4 23 back through 4 21 1 Connect the power switch cable to PJ5 on the power switch board 2 Place the power switch into position on the power switch board 3 Insert the speaker fix shaft into the power board to secure the speaker Figure 4 23 Inserting the speaker fix shaft 4 Connect the flexible cable...

Page 160: ...eplacement Procedures 4 13 Power Switch Board Libretto 50CT 70CT Maintenance Manual 4 29 5 Install the LCD module FL inverter board display mask and battery as described in Sections 4 12 4 11 4 10 and 4 2 ...

Page 161: ...igure 4 24 1 Turn the computer off Disconnect the AC adapter and optional units from the computer 2 Remove the battery display mask FL inverter board LCD module and power switch board as described in Sections 4 2 and 4 10 through 4 13 3 Remove two silver M2x3 screws then the AccuPoint board metal plate and AccuPoint flexible cable Figure 4 24 AccuPoint board removal 4 Lift out the pointing switch ...

Page 162: ... refer to Figure 4 24 1 Replace the pointing switch buttons 2 Place the AccuPoint flexible cable into position then the metal plate and the AccuPoint board on top 3 Secure the AccuPoint board and metal plate with two silver M2x3 screws 4 Install the power switch board LCD module FL inverter board display mask and battery as described in Sections 4 13 back through 4 10 and 4 2 ...

Page 163: ...d LCD module power switch board and AccuPoint board as described in Sections 4 2 and 4 10 through 4 14 3 Turn the Display Assembly upside down and remove one silver M2x3 screw which secures the LCD flexible cable to the top cover Remove the tape and the plastic cover over the LCD flexible cable connected to the right side hinge 4 Remove one M2 5x5 screw which secures the left side hinge to the LCD...

Page 164: ...eforming the LCD flexible cable 3 While holding the hinge area roll put the LCD flexible cable back into the display assembly and place it into position 4 Place the right side hinge plastic cover into position and replace the tape that covers the hinge cover 5 Replace one M2x3 silver screw to secure the LCD flexible cable to the top cover 6 Replace one M2 5x5 screw to secure the left side hinge 7 ...

Page 165: ... and refer to Figures 4 27 to 4 29 1 Remove the I O adapter from the computer Disconnect all the external cables from the I O adapter 2 Turn the I O adapter upside down and remove three M2x4 silver screws and one M2x5 silver screw on the bottom and three M2x4 silver screws at the back Figure 4 27 Silver screw removal 3 Release five latches and remove the upper cover Figure 4 28 Upper cover removal...

Page 166: ...oval Installing the I O Adapter Board To install the I O adapter board follow the steps below and refer to Figures 4 29 back through 4 27 1 Reseat the I O adapter board and secure it with five M2x4 screws 2 Replace the upper cover 3 Turn the I O adapter upside down and secure three M2x4 silver screws and one M2x5 silver screw on the bottom and three M2x4 silver screws at the back ...

Page 167: ...Appendices ...

Page 168: ...App ii Libretto 50CT 70CT Maintenance Manual ...

Page 169: ...ector 68 pin C 7 C 7 PJ301 Headphone Connector 5 pin C 8 C 8 PJ401 DC IN Connector 2 pin C 8 C 9 PJ402 Battery Connector 10 pin C 8 Appendix D Key Layouts D 1 D 1 United States US Keyboard D 1 D 2 United Kingdom UK Keyboard D 1 D 3 German GR Keyboard D 2 D 4 French FR Keyboard D 2 Appendix E Wiring Diagrams E 1 E 1 Parallel Port Wraparound Connector E 1 E 2 Serial Port Wraparound Connector E 1 E 3...

Page 170: ... 140 pin 1 2 C 1 Table C 1 Exp Memory connector pin assignments 140 pin 2 2 C 2 Table C 2 Docking I F connector pin assignments 132 pin 1 2 C 3 Table C 2 Docking I F connector pin assignments 132 pin 2 2 C 4 Table C 3 LCD I F connector pin assignments 50 pin C 5 Table C 4 RTC Battery I F connector pin assignments 3 pin C 6 Table C 5 HDD I F connector pin assignments 44 pin C 6 Table C 6 PC Card co...

Page 171: ...s properly aligned and maximum visibility of the display is maintained 2 Be careful to align the holes at the four corners of the LCD module with the corresponding holes in its cover before securing the module with screws Do not force the module into place because stress can affect its performance Note The panel s polarized surface is easily scarred so handle it carefully 3 If the panel s surface ...

Page 172: ...th and then wipe the panel s surface Do not apply cleanser directly to the panel 4 If water or other liquid is left on the panel s surface for a long period it can change the screen s tint or stain it Be sure to quickly wipe off any liquid 5 Glass is used in the panel so be careful not to drop it or let it strike a hard object which could cause breakage or cracks ...

Page 173: ...damage from electrostatic discharge Be sure to wear a wrist or ankle ground when handling the module 7 Do not expose the module to direct sunlight or strong ultraviolet rays for long periods 8 Do not store the module at temperatures below specifications Cold can cause the liquid crystals to freeze lose their elasticity or otherwise suffer damage ...

Page 174: ...ce Manual 9 Do not disassemble the LCD module Disassembly can cause malfunctions 10 If you transport the module do not use packing material that contains epoxy resin amine or silicon glue alcohol or oxime These materials can release gas that can damage the panel s polarization ...

Page 175: ...Libretto 50CT 70CT Maintenance Manual B 1 Appendix B Appendix B Board Layout B 1 System Board Front View Figure B 1 System board layout front ...

Page 176: ...Appendix B Board Layout B 2 Libretto 50CT 70CT Maintenance Manual B 2 System Board Back View Figure B 2 System board layout back ...

Page 177: ...I F connector F PJ7 PC card connector G PJ401 DC IN connector Table B 2 System board back Mark Number Name A IC1 CPU B IC3 IC4 IC5 IC6 16M DRAM C IC11 Clock generator D IC12 VGA GA E IC17 Flash BIOS F IC20 Keyboard controller G IC301 Libretto 50CT OPL3SA2 Libretto 70CT OPL3SA2 H PJ3 Display assembly I Fconnector I PJ4 RTC battery connector J PJ6 Keyboard I F connector K PJ301 Headphone connector ...

Page 178: ...Appendix B Board Layout B 4 Libretto 50CT 70CT Maintenance Manual ...

Page 179: ... O 18 B3VEXT 19 GND 20 D42 100 I O 21 D46 100 I O 22 D43 100 I O 23 D47 100 I O 24 D16 100 I O 25 D20 100 I O 26 GND 27 B3VEXT 28 D17 100 I O 29 D21 100 I O 30 D18 100 I O 31 D22 100 I O 32 D19 100 I O 33 D23 100 I O 34 B3VEXT 35 GND 36 D24 100 I O 37 D28 100 I O 38 D25 100 I O 39 D29 100 I O 40 D26 100 I O 41 D30 100 I O 42 GND 43 B3VEXT 44 D27 100 I O 45 D31 100 I O 46 D0 100 I O 47 D4 100 I O 4...

Page 180: ... I O 84 D59 100 I O 85 D63 100 I O 86 GND 87 CAS1 010 O 88 CAS0 010 O 89 CAS3 010 O 90 CAS2 010 O 91 CAS5 010 O 92 CAS4 010 O 93 CAS7 010 O 94 CAS6 010 O 95 NC 96 NC 97 NC 98 NC 99 WE1 010 O 100 GND 101 GND 102 GND 103 GND 104 NC 105 RAS0 010 O 106 RAS2 010 O 107 RAS1 010 O 108 RAS3 010 O 109 NC 110 NC 111 NC 112 NC 113 NC 114 NC 115 NC 116 NC 117 GND 118 GND 119 NC 120 NC 121 GND 122 GND 123 NC 1...

Page 181: ...000 I 19 SELCT 100 I 20 ERROR 000 I 21 STROB 000 O 22 AUTFD 000 O 23 SLIN 000 O 24 PINT 000 O 25 PD0 100 I O 26 PD1 100 I O 27 PD2 100 I O 28 PD3 100 I O 29 PD4 100 I O 30 PD5 100 I O 31 PD6 100 I O 32 PD7 100 I O 33 PCD00B 100 I O 34 PCD01B 100 I O 35 PCD02B 100 I O 36 PCD03B 100 I O 37 PCD04B 100 I O 38 PCD05B 100 I O 39 PCD06B 100 I O 40 PCD07B 100 I O 41 PCD08B 100 I O 42 PCD09B 100 I O 43 PCD...

Page 182: ...AD05B 100 O 86 CAD07B 100 O 87 CAD08B 100 O 88 CAD09B 100 O 89 CAD10B 100 O 90 CAD11B 100 O 91 CAD12B 100 O 92 CAD13B 100 O 93 CAD14B 100 O 94 CAD15B 100 O 95 CAD16B 100 O 96 CAD17B 100 O 97 CAD18B 100 O 98 CAD19B 100 O 99 GND 100 GND 101 CAD20B 100 O 102 CAD21B 100 O 103 CAD22B 100 O 104 CAD23B 100 O 105 CAD24B 100 O 106 CAD25B 100 O 107 BSYB 100 I 108 BVD1B 100 I 109 BVD2B 100 I 110 CD1B 000 I 1...

Page 183: ...Appendix C Pin Assignments Libretto 50CT 70CT Maintenance Manual C 5 ...

Page 184: ... 120 O 11 ENDATA 120 O 12 LP 120 O 13 FP 120 O 14 SHFCLK 120 O 15 PNLST 100 I 16 GND 17 GND 18 GND 19 GND 20 GND 21 GND 22 GND 23 GND 24 GND 25 GND 26 IPSDAT 100 I O 27 SPKRTN 120 I O 28 PNLD08 120 O 29 PNLD07 120 O 30 PNLD06 120 O 31 PNLD05 120 O 32 PNLD04 120 O 33 PNLD03 120 O 34 PNLD02 120 O 35 PNLD01 120 O 36 PNLD00 120 O 37 ISARST 000 O 38 SPKOUT 100 I O 39 DCGRN 000 O 40 PLED 41 DCORG 000 O ...

Page 185: ... Name I O Pin No Signal Name I O 01 ISARST 000 O 02 GND 03 SD7 100 I O 04 SA8 100 O 05 SD6 100 I O 06 SA9 100 O 07 SD5 100 I O 08 SA10 100 O 09 SD4 100 I O 10 SA11 100 O 11 SD3 100 I O 12 SA12 100 O 13 SD2 100 I O 14 SA13 100 O 15 SD1 100 I O 16 SA14 100 O 17 SD0 100 I O 18 SA15 100 O 19 GND 20 NC 21 NC 22 GND 23 FIOW 010 O 24 GND 25 FIOR 010 O 26 GND 27 IOCRDY 100 I 28 NC 29 NC 30 GND 31 IRQ14 10...

Page 186: ...Appendix Appendix C Pin Assignments C 8 Libretto 50CT 70CT Maintenance Manual 43 GND 44 NC ...

Page 187: ... O 21 CAD12A 100 O 22 CAD07A 100 O 23 CAD06A 100 O 24 CAD05 100 O 25 CAD04 100 O 26 CAD03 100 O 27 CAD02 100 O 28 CAD01 100 O 29 CAD00A 100 O 30 PCD00A 100 I O 31 PCD01A 100 I O 32 PCD02A 100 I O 33 WPA 000 I 34 GND 35 GND 36 CD1A 000 I 37 PCD11A 100 I O 38 PCD12A 100 I O 39 PCD13A 100 I O 40 PCD14A 100 I O 41 PCD15A 100 I O 42 CE2A 000 O 43 NC 44 IORA 000 O 45 IOWA 000 O 46 CAD17A 100 O 47 CAD18A...

Page 188: ...2 PHONEL O 03 PHONER O 10 SPKL I 11 SPKR I C 8 PJ401 DC IN Connector 2 pin Table C 8 DC IN connector pin assignments 2 pin Pin No Signal Name I O Pin No Signal Name I O 01 VCC 02 GND C 9 PJ402 Battery Connector 10 pin Table C 9 Battery connector pin assignments 10 pin Pin No Signal Name I O Pin No Signal Name I O 01 BATV 02 ATBAT I 03 BATGATE I 04 P12C 05 SCL 000 I O 06 SDA 000 I O 07 GND 08 BATOV...

Page 189: ...Libretto 50CT 70CT Maintenance Manual D 1 Appendix D Appendix D Key Layouts D 1 United States US Keyboard Figure D 1 US keyboard D 2 United Kingdom UK Keyboard Figure D 2 UK keyboard ...

Page 190: ...Appendix Appendix D Key Layout D 2 Libretto 50CT 70CT Maintenance Manual D 3 German GR Keyboard Figure D 3 GR keyboard D 4 French FR Keyboard Figure D 4 FR keyboard ...

Page 191: ...ntenance Manual E 1 Appendix E Appendix E Wiring Diagrams E 1 Parallel Port Wraparound Connector Figure E 1 Parallel port wraparound connector E 2 Serial Port Wraparound Connector Figure E 2 Serial port wraparound connector ...

Page 192: ...2 Libretto 50CT 70CT Maintenance Manual E 3 Serial Port Direct Cable 9 Pin to 9 Pin Figure E 3 Serial port direct cable 9 pin to 9 pin E 4 Serial Port Direct Cable 9 Pin to 25 Pin Figure E 4 Serial port direct cable 9 pin to 25 pin ...

Page 193: ...uter Rewriting the BIOS 1 Set the system to boot mode 2 Turn the power off 3 Remove the external cable and any optional memory or PC card 4 Turn the power on while holding the F12 key down Keep holding the key down until the system speaker sounds a beep 5 When the BIOS message displays insert the diagnostics disk into the FDD then press Enter to start the BIOS rewrite program 6 When the process is...

Page 194: ...Appendix F BIOS Rewrite Procedures F 2 Libretto 50CT 70CT Maintenance Manual ...

Page 195: ... G Appendix G Reliability The following table shows Mean Time Between Failures MTBF for each component Table G 1 MTBF Component Time hours LCD 50 000 Keyboard 37 000 HDD 300 000 FDD option 30 000 AccuPoint 37 000 FL Inverter 50 000 AC Power Unit 50 000 ...

Page 196: ...Appendix G Reliability G 2 Libretto 50CT 70CT Maintenance Manual ...

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